Use FirstOrDefaultAsync() instead of SingleOrDefaultAsync() to avoid generating SELECT TOP(2) SQL requests

src/OpenIddict.Core/Managers/OpenIddictApplicationManager.cs

@@ -312,14 +312,14 @@ namespace OpenIddict.Core
         }
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns the first element.
         /// </summary>
         /// <typeparam name="TResult">The result type.</typeparam>
         /// <param name="query">The query to execute.</param>
         /// <param name="cancellationToken">The <see cref="CancellationToken"/> that can be used to abort the operation.</param>
         /// <returns>
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
-        /// whose result returns the single element returned when executing the specified query.
+        /// whose result returns the first element returned when executing the query.
         /// </returns>
         public virtual Task<TResult> GetAsync<TResult>([NotNull] Func<IQueryable<TApplication>, IQueryable<TResult>> query, CancellationToken cancellationToken)
         {
@@ -486,7 +486,7 @@ namespace OpenIddict.Core
         }
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns all the corresponding elements.
         /// </summary>
         /// <param name="count">The number of results to return.</param>
         /// <param name="offset">The number of results to skip.</param>
@@ -501,7 +501,7 @@ namespace OpenIddict.Core
         }
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns all the corresponding elements.
         /// </summary>
         /// <typeparam name="TResult">The result type.</typeparam>
         /// <param name="query">The query to execute.</param>

src/OpenIddict.Core/Managers/OpenIddictAuthorizationManager.cs

@@ -237,14 +237,14 @@ namespace OpenIddict.Core
         }
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns the first element.
         /// </summary>
         /// <typeparam name="TResult">The result type.</typeparam>
         /// <param name="query">The query to execute.</param>
         /// <param name="cancellationToken">The <see cref="CancellationToken"/> that can be used to abort the operation.</param>
         /// <returns>
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
-        /// whose result returns the single element returned when executing the specified query.
+        /// whose result returns the first element returned when executing the query.
         /// </returns>
         public virtual Task<TResult> GetAsync<TResult>([NotNull] Func<IQueryable<TAuthorization>, IQueryable<TResult>> query, CancellationToken cancellationToken)
         {
@@ -339,7 +339,7 @@ namespace OpenIddict.Core
         }
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns all the corresponding elements.
         /// </summary>
         /// <param name="count">The number of results to return.</param>
         /// <param name="offset">The number of results to skip.</param>
@@ -354,7 +354,7 @@ namespace OpenIddict.Core
         }
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns all the corresponding elements.
         /// </summary>
         /// <typeparam name="TResult">The result type.</typeparam>
         /// <param name="query">The query to execute.</param>

src/OpenIddict.Core/Managers/OpenIddictScopeManager.cs

@@ -156,14 +156,14 @@ namespace OpenIddict.Core
         }
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns the first element.
         /// </summary>
         /// <typeparam name="TResult">The result type.</typeparam>
         /// <param name="query">The query to execute.</param>
         /// <param name="cancellationToken">The <see cref="CancellationToken"/> that can be used to abort the operation.</param>
         /// <returns>
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
-        /// whose result returns the single element returned when executing the specified query.
+        /// whose result returns the first element returned when executing the query.
         /// </returns>
         public virtual Task<TResult> GetAsync<TResult>([NotNull] Func<IQueryable<TScope>, IQueryable<TResult>> query, CancellationToken cancellationToken)
         {
@@ -176,7 +176,7 @@ namespace OpenIddict.Core
         }
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns all the corresponding elements.
         /// </summary>
         /// <param name="count">The number of results to return.</param>
         /// <param name="offset">The number of results to skip.</param>
@@ -191,7 +191,7 @@ namespace OpenIddict.Core
         }
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns all the corresponding elements.
         /// </summary>
         /// <typeparam name="TResult">The result type.</typeparam>
         /// <param name="query">The query to execute.</param>

src/OpenIddict.Core/Managers/OpenIddictTokenManager.cs

@@ -294,14 +294,14 @@ namespace OpenIddict.Core
         }
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns the first element.
         /// </summary>
         /// <typeparam name="TResult">The result type.</typeparam>
         /// <param name="query">The query to execute.</param>
         /// <param name="cancellationToken">The <see cref="CancellationToken"/> that can be used to abort the operation.</param>
         /// <returns>
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
-        /// whose result returns the single element returned when executing the specified query.
+        /// whose result returns the first element returned when executing the query.
         /// </returns>
         public virtual Task<TResult> GetAsync<TResult>([NotNull] Func<IQueryable<TToken>, IQueryable<TResult>> query, CancellationToken cancellationToken)
         {
@@ -513,7 +513,7 @@ namespace OpenIddict.Core
         }
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns all the corresponding elements.
         /// </summary>
         /// <param name="count">The number of results to return.</param>
         /// <param name="offset">The number of results to skip.</param>
@@ -528,7 +528,7 @@ namespace OpenIddict.Core
         }
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns all the corresponding elements.
         /// </summary>
         /// <typeparam name="TResult">The result type.</typeparam>
         /// <param name="query">The query to execute.</param>

src/OpenIddict.Core/Stores/IOpenIddictApplicationStore.cs

@@ -117,14 +117,14 @@ namespace OpenIddict.Core
         Task<ImmutableArray<TApplication>> FindByRedirectUriAsync([NotNull] string address, CancellationToken cancellationToken);
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns the first element.
         /// </summary>
         /// <typeparam name="TResult">The result type.</typeparam>
         /// <param name="query">The query to execute.</param>
         /// <param name="cancellationToken">The <see cref="CancellationToken"/> that can be used to abort the operation.</param>
         /// <returns>
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
-        /// whose result returns the single element returned when executing the specified query.
+        /// whose result returns the first element returned when executing the query.
         /// </returns>
         Task<TResult> GetAsync<TResult>([NotNull] Func<IQueryable<TApplication>, IQueryable<TResult>> query, CancellationToken cancellationToken);
 
@@ -208,7 +208,7 @@ namespace OpenIddict.Core
         Task<ImmutableArray<string>> GetRedirectUrisAsync([NotNull] TApplication application, CancellationToken cancellationToken);
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns all the corresponding elements.
         /// </summary>
         /// <param name="count">The number of results to return.</param>
         /// <param name="offset">The number of results to skip.</param>
@@ -220,7 +220,7 @@ namespace OpenIddict.Core
         Task<ImmutableArray<TApplication>> ListAsync([CanBeNull] int? count, [CanBeNull] int? offset, CancellationToken cancellationToken);
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns all the corresponding elements.
         /// </summary>
         /// <typeparam name="TResult">The result type.</typeparam>
         /// <param name="query">The query to execute.</param>

src/OpenIddict.Core/Stores/IOpenIddictAuthorizationStore.cs

@@ -107,14 +107,14 @@ namespace OpenIddict.Core
         Task<string> GetApplicationIdAsync([NotNull] TAuthorization authorization, CancellationToken cancellationToken);
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns the first element.
         /// </summary>
         /// <typeparam name="TResult">The result type.</typeparam>
         /// <param name="query">The query to execute.</param>
         /// <param name="cancellationToken">The <see cref="CancellationToken"/> that can be used to abort the operation.</param>
         /// <returns>
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
-        /// whose result returns the single element returned when executing the specified query.
+        /// whose result returns the first element returned when executing the query.
         /// </returns>
         Task<TResult> GetAsync<TResult>([NotNull] Func<IQueryable<TAuthorization>, IQueryable<TResult>> query, CancellationToken cancellationToken);
 
@@ -163,7 +163,7 @@ namespace OpenIddict.Core
         Task<string> GetTypeAsync([NotNull] TAuthorization authorization, CancellationToken cancellationToken);
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns all the corresponding elements.
         /// </summary>
         /// <param name="count">The number of results to return.</param>
         /// <param name="offset">The number of results to skip.</param>
@@ -175,7 +175,7 @@ namespace OpenIddict.Core
         Task<ImmutableArray<TAuthorization>> ListAsync([CanBeNull] int? count, [CanBeNull] int? offset, CancellationToken cancellationToken);
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns all the corresponding elements.
         /// </summary>
         /// <typeparam name="TResult">The result type.</typeparam>
         /// <param name="query">The query to execute.</param>

src/OpenIddict.Core/Stores/IOpenIddictScopeStore.cs

@@ -72,19 +72,19 @@ namespace OpenIddict.Core
         Task DeleteAsync([NotNull] TScope scope, CancellationToken cancellationToken);
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns the first element.
         /// </summary>
         /// <typeparam name="TResult">The result type.</typeparam>
         /// <param name="query">The query to execute.</param>
         /// <param name="cancellationToken">The <see cref="CancellationToken"/> that can be used to abort the operation.</param>
         /// <returns>
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
-        /// whose result returns the single element returned when executing the specified query.
+        /// whose result returns the first element returned when executing the query.
         /// </returns>
         Task<TResult> GetAsync<TResult>([NotNull] Func<IQueryable<TScope>, IQueryable<TResult>> query, CancellationToken cancellationToken);
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns all the corresponding elements.
         /// </summary>
         /// <param name="count">The number of results to return.</param>
         /// <param name="offset">The number of results to skip.</param>
@@ -96,7 +96,7 @@ namespace OpenIddict.Core
         Task<ImmutableArray<TScope>> ListAsync([CanBeNull] int? count, [CanBeNull] int? offset, CancellationToken cancellationToken);
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns all the corresponding elements.
         /// </summary>
         /// <typeparam name="TResult">The result type.</typeparam>
         /// <param name="query">The query to execute.</param>

src/OpenIddict.Core/Stores/IOpenIddictTokenStore.cs

@@ -136,14 +136,14 @@ namespace OpenIddict.Core
         Task<string> GetApplicationIdAsync([NotNull] TToken token, CancellationToken cancellationToken);
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns the first element.
         /// </summary>
         /// <typeparam name="TResult">The result type.</typeparam>
         /// <param name="query">The query to execute.</param>
         /// <param name="cancellationToken">The <see cref="CancellationToken"/> that can be used to abort the operation.</param>
         /// <returns>
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
-        /// whose result returns the single element returned when executing the specified query.
+        /// whose result returns the first element returned when executing the query.
         /// </returns>
         Task<TResult> GetAsync<TResult>([NotNull] Func<IQueryable<TToken>, IQueryable<TResult>> query, CancellationToken cancellationToken);
 
@@ -247,7 +247,7 @@ namespace OpenIddict.Core
         Task<string> GetTokenTypeAsync([NotNull] TToken token, CancellationToken cancellationToken);
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns all the corresponding elements.
         /// </summary>
         /// <param name="count">The number of results to return.</param>
         /// <param name="offset">The number of results to skip.</param>
@@ -259,7 +259,7 @@ namespace OpenIddict.Core
         Task<ImmutableArray<TToken>> ListAsync([CanBeNull] int? count, [CanBeNull] int? offset, CancellationToken cancellationToken);
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns all the corresponding elements.
         /// </summary>
         /// <typeparam name="TResult">The result type.</typeparam>
         /// <param name="query">The query to execute.</param>

src/OpenIddict.Core/Stores/OpenIddictApplicationStore.cs

@@ -261,14 +261,14 @@ namespace OpenIddict.Core
         }
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns the first element.
         /// </summary>
         /// <typeparam name="TResult">The result type.</typeparam>
         /// <param name="query">The query to execute.</param>
         /// <param name="cancellationToken">The <see cref="CancellationToken"/> that can be used to abort the operation.</param>
         /// <returns>
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
-        /// whose result returns the single element returned when executing the specified query.
+        /// whose result returns the first element returned when executing the query.
         /// </returns>
         public abstract Task<TResult> GetAsync<TResult>([NotNull] Func<IQueryable<TApplication>, IQueryable<TResult>> query, CancellationToken cancellationToken);
 
@@ -426,7 +426,7 @@ namespace OpenIddict.Core
         }
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns all the corresponding elements.
         /// </summary>
         /// <param name="count">The number of results to return.</param>
         /// <param name="offset">The number of results to skip.</param>
@@ -458,7 +458,7 @@ namespace OpenIddict.Core
         }
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns all the corresponding elements.
         /// </summary>
         /// <typeparam name="TResult">The result type.</typeparam>
         /// <param name="query">The query to execute.</param>

src/OpenIddict.Core/Stores/OpenIddictAuthorizationStore.cs

@@ -179,14 +179,14 @@ namespace OpenIddict.Core
         }
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns the first element.
         /// </summary>
         /// <typeparam name="TResult">The result type.</typeparam>
         /// <param name="query">The query to execute.</param>
         /// <param name="cancellationToken">The <see cref="CancellationToken"/> that can be used to abort the operation.</param>
         /// <returns>
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
-        /// whose result returns the single element returned when executing the specified query.
+        /// whose result returns the first element returned when executing the query.
         /// </returns>
         public abstract Task<TResult> GetAsync<TResult>([NotNull] Func<IQueryable<TAuthorization>, IQueryable<TResult>> query, CancellationToken cancellationToken);
 
@@ -262,7 +262,7 @@ namespace OpenIddict.Core
         }
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns all the corresponding elements.
         /// </summary>
         /// <param name="count">The number of results to return.</param>
         /// <param name="offset">The number of results to skip.</param>
@@ -294,7 +294,7 @@ namespace OpenIddict.Core
         }
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns all the corresponding elements.
         /// </summary>
         /// <typeparam name="TResult">The result type.</typeparam>
         /// <param name="query">The query to execute.</param>

src/OpenIddict.Core/Stores/OpenIddictScopeStore.cs

@@ -81,19 +81,19 @@ namespace OpenIddict.Core
         public abstract Task DeleteAsync([NotNull] TScope scope, CancellationToken cancellationToken);
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns the first element.
         /// </summary>
         /// <typeparam name="TResult">The result type.</typeparam>
         /// <param name="query">The query to execute.</param>
         /// <param name="cancellationToken">The <see cref="CancellationToken"/> that can be used to abort the operation.</param>
         /// <returns>
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
-        /// whose result returns the single element returned when executing the specified query.
+        /// whose result returns the first element returned when executing the query.
         /// </returns>
         public abstract Task<TResult> GetAsync<TResult>([NotNull] Func<IQueryable<TScope>, IQueryable<TResult>> query, CancellationToken cancellationToken);
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns all the corresponding elements.
         /// </summary>
         /// <param name="count">The number of results to return.</param>
         /// <param name="offset">The number of results to skip.</param>
@@ -125,7 +125,7 @@ namespace OpenIddict.Core
         }
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns all the corresponding elements.
         /// </summary>
         /// <typeparam name="TResult">The result type.</typeparam>
         /// <param name="query">The query to execute.</param>

src/OpenIddict.Core/Stores/OpenIddictTokenStore.cs

@@ -221,14 +221,14 @@ namespace OpenIddict.Core
         }
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns the first element.
         /// </summary>
         /// <typeparam name="TResult">The result type.</typeparam>
         /// <param name="query">The query to execute.</param>
         /// <param name="cancellationToken">The <see cref="CancellationToken"/> that can be used to abort the operation.</param>
         /// <returns>
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
-        /// whose result returns the single element returned when executing the specified query.
+        /// whose result returns the first element returned when executing the query.
         /// </returns>
         public abstract Task<TResult> GetAsync<TResult>([NotNull] Func<IQueryable<TToken>, IQueryable<TResult>> query, CancellationToken cancellationToken);
 
@@ -443,7 +443,7 @@ namespace OpenIddict.Core
         }
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns all the corresponding elements.
         /// </summary>
         /// <param name="count">The number of results to return.</param>
         /// <param name="offset">The number of results to skip.</param>
@@ -475,7 +475,7 @@ namespace OpenIddict.Core
         }
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns all the corresponding elements.
         /// </summary>
         /// <typeparam name="TResult">The result type.</typeparam>
         /// <param name="query">The query to execute.</param>

src/OpenIddict.EntityFramework/Stores/OpenIddictApplicationStore.cs

@@ -227,14 +227,14 @@ namespace OpenIddict.EntityFramework
         }
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns the first element.
         /// </summary>
         /// <typeparam name="TResult">The result type.</typeparam>
         /// <param name="query">The query to execute.</param>
         /// <param name="cancellationToken">The <see cref="CancellationToken"/> that can be used to abort the operation.</param>
         /// <returns>
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
-        /// whose result returns the single element returned when executing the specified query.
+        /// whose result returns the first element returned when executing the query.
         /// </returns>
         public override Task<TResult> GetAsync<TResult>([NotNull] Func<IQueryable<TApplication>, IQueryable<TResult>> query, CancellationToken cancellationToken)
         {
@@ -243,11 +243,11 @@ namespace OpenIddict.EntityFramework
                 throw new ArgumentNullException(nameof(query));
             }
 
-            return query(Applications).SingleOrDefaultAsync(cancellationToken);
+            return query(Applications).FirstOrDefaultAsync(cancellationToken);
         }
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns all the corresponding elements.
         /// </summary>
         /// <typeparam name="TResult">The result type.</typeparam>
         /// <param name="query">The query to execute.</param>

src/OpenIddict.EntityFramework/Stores/OpenIddictAuthorizationStore.cs

@@ -240,14 +240,14 @@ namespace OpenIddict.EntityFramework
         }
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns the first element.
         /// </summary>
         /// <typeparam name="TResult">The result type.</typeparam>
         /// <param name="query">The query to execute.</param>
         /// <param name="cancellationToken">The <see cref="CancellationToken"/> that can be used to abort the operation.</param>
         /// <returns>
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
-        /// whose result returns the single element returned when executing the specified query.
+        /// whose result returns the first element returned when executing the query.
         /// </returns>
         public override Task<TResult> GetAsync<TResult>([NotNull] Func<IQueryable<TAuthorization>, IQueryable<TResult>> query, CancellationToken cancellationToken)
         {
@@ -256,11 +256,11 @@ namespace OpenIddict.EntityFramework
                 throw new ArgumentNullException(nameof(query));
             }
 
-            return query(Authorizations).SingleOrDefaultAsync(cancellationToken);
+            return query(Authorizations).FirstOrDefaultAsync(cancellationToken);
         }
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns all the corresponding elements.
         /// </summary>
         /// <typeparam name="TResult">The result type.</typeparam>
         /// <param name="query">The query to execute.</param>

src/OpenIddict.EntityFramework/Stores/OpenIddictScopeStore.cs

@@ -151,14 +151,14 @@ namespace OpenIddict.EntityFramework
         }
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns the first element.
         /// </summary>
         /// <typeparam name="TResult">The result type.</typeparam>
         /// <param name="query">The query to execute.</param>
         /// <param name="cancellationToken">The <see cref="CancellationToken"/> that can be used to abort the operation.</param>
         /// <returns>
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
-        /// whose result returns the single element returned when executing the specified query.
+        /// whose result returns the first element returned when executing the query.
         /// </returns>
         public override Task<TResult> GetAsync<TResult>([NotNull] Func<IQueryable<TScope>, IQueryable<TResult>> query, CancellationToken cancellationToken)
         {
@@ -167,11 +167,11 @@ namespace OpenIddict.EntityFramework
                 throw new ArgumentNullException(nameof(query));
             }
 
-            return query(Scopes).SingleOrDefaultAsync(cancellationToken);
+            return query(Scopes).FirstOrDefaultAsync(cancellationToken);
         }
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns all the corresponding elements.
         /// </summary>
         /// <typeparam name="TResult">The result type.</typeparam>
         /// <param name="query">The query to execute.</param>

src/OpenIddict.EntityFramework/Stores/OpenIddictTokenStore.cs

@@ -224,14 +224,14 @@ namespace OpenIddict.EntityFramework
         }
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns the first element.
         /// </summary>
         /// <typeparam name="TResult">The result type.</typeparam>
         /// <param name="query">The query to execute.</param>
         /// <param name="cancellationToken">The <see cref="CancellationToken"/> that can be used to abort the operation.</param>
         /// <returns>
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
-        /// whose result returns the single element returned when executing the specified query.
+        /// whose result returns the first element returned when executing the query.
         /// </returns>
         public override Task<TResult> GetAsync<TResult>([NotNull] Func<IQueryable<TToken>, IQueryable<TResult>> query, CancellationToken cancellationToken)
         {
@@ -240,7 +240,7 @@ namespace OpenIddict.EntityFramework
                 throw new ArgumentNullException(nameof(query));
             }
 
-            return query(Tokens).SingleOrDefaultAsync(cancellationToken);
+            return query(Tokens).FirstOrDefaultAsync(cancellationToken);
         }
 
         /// <summary>
@@ -276,7 +276,7 @@ namespace OpenIddict.EntityFramework
         }
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns all the corresponding elements.
         /// </summary>
         /// <typeparam name="TResult">The result type.</typeparam>
         /// <param name="query">The query to execute.</param>

src/OpenIddict.EntityFrameworkCore/Stores/OpenIddictApplicationStore.cs

@@ -227,14 +227,14 @@ namespace OpenIddict.EntityFrameworkCore
         }
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns the first element.
         /// </summary>
         /// <typeparam name="TResult">The result type.</typeparam>
         /// <param name="query">The query to execute.</param>
         /// <param name="cancellationToken">The <see cref="CancellationToken"/> that can be used to abort the operation.</param>
         /// <returns>
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
-        /// whose result returns the single element returned when executing the specified query.
+        /// whose result returns the first element returned when executing the query.
         /// </returns>
         public override Task<TResult> GetAsync<TResult>([NotNull] Func<IQueryable<TApplication>, IQueryable<TResult>> query, CancellationToken cancellationToken)
         {
@@ -243,11 +243,11 @@ namespace OpenIddict.EntityFrameworkCore
                 throw new ArgumentNullException(nameof(query));
             }
 
-            return query(Applications).SingleOrDefaultAsync(cancellationToken);
+            return query(Applications).FirstOrDefaultAsync(cancellationToken);
         }
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns all the corresponding elements.
         /// </summary>
         /// <typeparam name="TResult">The result type.</typeparam>
         /// <param name="query">The query to execute.</param>

src/OpenIddict.EntityFrameworkCore/Stores/OpenIddictAuthorizationStore.cs

@@ -282,14 +282,14 @@ namespace OpenIddict.EntityFrameworkCore
         }
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns the first element.
         /// </summary>
         /// <typeparam name="TResult">The result type.</typeparam>
         /// <param name="query">The query to execute.</param>
         /// <param name="cancellationToken">The <see cref="CancellationToken"/> that can be used to abort the operation.</param>
         /// <returns>
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
-        /// whose result returns the single element returned when executing the specified query.
+        /// whose result returns the first element returned when executing the query.
         /// </returns>
         public override Task<TResult> GetAsync<TResult>([NotNull] Func<IQueryable<TAuthorization>, IQueryable<TResult>> query, CancellationToken cancellationToken)
         {
@@ -298,11 +298,11 @@ namespace OpenIddict.EntityFrameworkCore
                 throw new ArgumentNullException(nameof(query));
             }
 
-            return query(Authorizations).SingleOrDefaultAsync(cancellationToken);
+            return query(Authorizations).FirstOrDefaultAsync(cancellationToken);
         }
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns all the corresponding elements.
         /// </summary>
         /// <typeparam name="TResult">The result type.</typeparam>
         /// <param name="query">The query to execute.</param>

src/OpenIddict.EntityFrameworkCore/Stores/OpenIddictScopeStore.cs

@@ -151,14 +151,14 @@ namespace OpenIddict.EntityFrameworkCore
         }
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns the first element.
         /// </summary>
         /// <typeparam name="TResult">The result type.</typeparam>
         /// <param name="query">The query to execute.</param>
         /// <param name="cancellationToken">The <see cref="CancellationToken"/> that can be used to abort the operation.</param>
         /// <returns>
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
-        /// whose result returns the single element returned when executing the specified query.
+        /// whose result returns the first element returned when executing the query.
         /// </returns>
         public override Task<TResult> GetAsync<TResult>([NotNull] Func<IQueryable<TScope>, IQueryable<TResult>> query, CancellationToken cancellationToken)
         {
@@ -167,11 +167,11 @@ namespace OpenIddict.EntityFrameworkCore
                 throw new ArgumentNullException(nameof(query));
             }
 
-            return query(Scopes).SingleOrDefaultAsync(cancellationToken);
+            return query(Scopes).FirstOrDefaultAsync(cancellationToken);
         }
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns all the corresponding elements.
         /// </summary>
         /// <typeparam name="TResult">The result type.</typeparam>
         /// <param name="query">The query to execute.</param>

src/OpenIddict.EntityFrameworkCore/Stores/OpenIddictTokenStore.cs

@@ -292,14 +292,14 @@ namespace OpenIddict.EntityFrameworkCore
         }
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns the first element.
         /// </summary>
         /// <typeparam name="TResult">The result type.</typeparam>
         /// <param name="query">The query to execute.</param>
         /// <param name="cancellationToken">The <see cref="CancellationToken"/> that can be used to abort the operation.</param>
         /// <returns>
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
-        /// whose result returns the single element returned when executing the specified query.
+        /// whose result returns the first element returned when executing the query.
         /// </returns>
         public override Task<TResult> GetAsync<TResult>([NotNull] Func<IQueryable<TToken>, IQueryable<TResult>> query, CancellationToken cancellationToken)
         {
@@ -308,7 +308,7 @@ namespace OpenIddict.EntityFrameworkCore
                 throw new ArgumentNullException(nameof(query));
             }
 
-            return query(Tokens).SingleOrDefaultAsync(cancellationToken);
+            return query(Tokens).FirstOrDefaultAsync(cancellationToken);
         }
 
         /// <summary>
@@ -344,7 +344,7 @@ namespace OpenIddict.EntityFrameworkCore
         }
 
         /// <summary>
-        /// Executes the specified query.
+        /// Executes the specified query and returns all the corresponding elements.
         /// </summary>
         /// <typeparam name="TResult">The result type.</typeparam>
         /// <param name="query">The query to execute.</param>