diff --git a/src/EFCore.Relational/Query/QuerySqlGenerator.cs b/src/EFCore.Relational/Query/QuerySqlGenerator.cs
index 8db287f17ee..e587fe12e3a 100644
--- a/src/EFCore.Relational/Query/QuerySqlGenerator.cs
+++ b/src/EFCore.Relational/Query/QuerySqlGenerator.cs
@@ -250,7 +250,7 @@ protected override Expression VisitSelect(SelectExpression selectExpression)
             }
             else
             {
-                _relationalCommandBuilder.Append("1");
+                GenerateEmptyProjection(selectExpression);
             }
 
             if (selectExpression.Tables.Any())
@@ -309,6 +309,15 @@ protected virtual void GeneratePseudoFromClause()
     {
     }
 
+    /// <summary>
+    ///     Generates empty projection for a SelectExpression.
+    /// </summary>
+    /// <param name="selectExpression">SelectExpression for which the empty projection will be generated.</param>
+    protected virtual void GenerateEmptyProjection(SelectExpression selectExpression)
+    {
+        _relationalCommandBuilder.Append("1");
+    }
+
     /// <inheritdoc />
     protected override Expression VisitProjection(ProjectionExpression projectionExpression)
     {
diff --git a/src/EFCore.SqlServer/Query/Internal/SqlServerQuerySqlGenerator.cs b/src/EFCore.SqlServer/Query/Internal/SqlServerQuerySqlGenerator.cs
index e318339c842..c681adb4627 100644
--- a/src/EFCore.SqlServer/Query/Internal/SqlServerQuerySqlGenerator.cs
+++ b/src/EFCore.SqlServer/Query/Internal/SqlServerQuerySqlGenerator.cs
@@ -16,6 +16,9 @@ namespace Microsoft.EntityFrameworkCore.SqlServer.Query.Internal;
 /// </summary>
 public class SqlServerQuerySqlGenerator : QuerySqlGenerator
 {
+    private static readonly bool UseOldBehavior29667
+        = AppContext.TryGetSwitch("Microsoft.EntityFrameworkCore.Issue29667", out var enabled29667) && enabled29667;
+
     private readonly IRelationalTypeMappingSource _typeMappingSource;
 
     /// <summary>
@@ -72,6 +75,21 @@ protected override Expression VisitDelete(DeleteExpression deleteExpression)
             RelationalStrings.ExecuteOperationWithUnsupportedOperatorInSqlGeneration(nameof(RelationalQueryableExtensions.ExecuteDelete)));
     }
 
+    /// <summary>
+    ///     This is an internal API that supports the Entity Framework Core infrastructure and not subject to
+    ///     the same compatibility standards as public APIs. It may be changed or removed without notice in
+    ///     any release. You should only use it directly in your code with extreme caution and knowing that
+    ///     doing so can result in application failures when updating to a new Entity Framework Core release.
+    /// </summary>
+    protected override void GenerateEmptyProjection(SelectExpression selectExpression)
+    {
+        base.GenerateEmptyProjection(selectExpression);
+        if (!UseOldBehavior29667 && selectExpression.Alias != null)
+        {
+            Sql.Append(" AS empty");
+        }
+    }
+
     /// <summary>
     ///     This is an internal API that supports the Entity Framework Core infrastructure and not subject to
     ///     the same compatibility standards as public APIs. It may be changed or removed without notice in
diff --git a/test/EFCore.Cosmos.FunctionalTests/Query/NorthwindKeylessEntitiesQueryCosmosTest.cs b/test/EFCore.Cosmos.FunctionalTests/Query/NorthwindKeylessEntitiesQueryCosmosTest.cs
index efda76c9a06..52bf66aa0cf 100644
--- a/test/EFCore.Cosmos.FunctionalTests/Query/NorthwindKeylessEntitiesQueryCosmosTest.cs
+++ b/test/EFCore.Cosmos.FunctionalTests/Query/NorthwindKeylessEntitiesQueryCosmosTest.cs
@@ -171,6 +171,30 @@ FROM root c
 """);
     }
 
+    public override async Task Count_over_keyless_entity(bool async)
+    {
+        await base.Count_over_keyless_entity(async);
+
+        AssertSql(
+"""
+SELECT COUNT(1) AS c
+FROM root c
+WHERE (c["Discriminator"] = "Customer")
+""");
+    }
+
+    public override async Task Count_over_keyless_entity_with_pushdown(bool async)
+    {
+        // Cosmos client evaluation. Issue #17246.
+        await AssertTranslationFailed(() => base.Count_over_keyless_entity_with_pushdown(async));
+    }
+
+    public override async Task Count_over_keyless_entity_with_pushdown_empty_projection(bool async)
+    {
+        // Cosmos client evaluation. Issue #17246.
+        await AssertTranslationFailed(() => base.Count_over_keyless_entity_with_pushdown_empty_projection(async));
+    }
+
     private void AssertSql(params string[] expected)
         => Fixture.TestSqlLoggerFactory.AssertBaseline(expected);
 
diff --git a/test/EFCore.Specification.Tests/Query/NorthwindKeylessEntitiesQueryTestBase.cs b/test/EFCore.Specification.Tests/Query/NorthwindKeylessEntitiesQueryTestBase.cs
index 30aecb7fa77..888b9fed440 100644
--- a/test/EFCore.Specification.Tests/Query/NorthwindKeylessEntitiesQueryTestBase.cs
+++ b/test/EFCore.Specification.Tests/Query/NorthwindKeylessEntitiesQueryTestBase.cs
@@ -167,4 +167,25 @@ public virtual Task Collection_correlated_with_keyless_entity_in_predicate_works
                 .Select(pv => new { pv.City, pv.ContactName })
                 .OrderBy(x => x.ContactName)
                 .Take(2));
+
+    [ConditionalTheory]
+    [MemberData(nameof(IsAsyncData))]
+    public virtual Task Count_over_keyless_entity(bool async)
+        => AssertCount(
+            async,
+            ss => ss.Set<CustomerQuery>());
+
+    [ConditionalTheory]
+    [MemberData(nameof(IsAsyncData))]
+    public virtual Task Count_over_keyless_entity_with_pushdown(bool async)
+        => AssertCount(
+            async,
+            ss => ss.Set<CustomerQuery>().OrderBy(x => x.ContactTitle).Take(10));
+
+    [ConditionalTheory]
+    [MemberData(nameof(IsAsyncData))]
+    public virtual Task Count_over_keyless_entity_with_pushdown_empty_projection(bool async)
+        => AssertCount(
+            async,
+            ss => ss.Set<CustomerQuery>().Take(10));
 }
diff --git a/test/EFCore.SqlServer.FunctionalTests/Query/NorthwindKeylessEntitiesQuerySqlServerTest.cs b/test/EFCore.SqlServer.FunctionalTests/Query/NorthwindKeylessEntitiesQuerySqlServerTest.cs
index b8d928af77d..16b49821dcf 100644
--- a/test/EFCore.SqlServer.FunctionalTests/Query/NorthwindKeylessEntitiesQuerySqlServerTest.cs
+++ b/test/EFCore.SqlServer.FunctionalTests/Query/NorthwindKeylessEntitiesQuerySqlServerTest.cs
@@ -232,6 +232,56 @@ public override async Task KeylessEntity_with_included_nav(bool async)
 """);
     }
 
+    public override async Task Count_over_keyless_entity(bool async)
+    {
+        await base.Count_over_keyless_entity(async);
+
+        AssertSql(
+"""
+SELECT COUNT(*)
+FROM (
+    SELECT [c].[CustomerID], [c].[Address], [c].[City], [c].[CompanyName], [c].[ContactName], [c].[ContactTitle], [c].[Country], [c].[Fax], [c].[Phone], [c].[PostalCode], [c].[Region] FROM [Customers] AS [c]
+) AS [m]
+""");
+    }
+
+    public override async Task Count_over_keyless_entity_with_pushdown(bool async)
+    {
+        await base.Count_over_keyless_entity_with_pushdown(async);
+
+        AssertSql(
+"""
+@__p_0='10'
+
+SELECT COUNT(*)
+FROM (
+    SELECT TOP(@__p_0) [m].[ContactTitle]
+    FROM (
+        SELECT [c].[CustomerID], [c].[Address], [c].[City], [c].[CompanyName], [c].[ContactName], [c].[ContactTitle], [c].[Country], [c].[Fax], [c].[Phone], [c].[PostalCode], [c].[Region] FROM [Customers] AS [c]
+    ) AS [m]
+    ORDER BY [m].[ContactTitle]
+) AS [t]
+""");
+    }
+
+    public override async Task Count_over_keyless_entity_with_pushdown_empty_projection(bool async)
+    {
+        await base.Count_over_keyless_entity_with_pushdown_empty_projection(async);
+
+        AssertSql(
+"""
+@__p_0='10'
+
+SELECT COUNT(*)
+FROM (
+    SELECT TOP(@__p_0) 1 AS empty
+    FROM (
+        SELECT [c].[CustomerID], [c].[Address], [c].[City], [c].[CompanyName], [c].[ContactName], [c].[ContactTitle], [c].[Country], [c].[Fax], [c].[Phone], [c].[PostalCode], [c].[Region] FROM [Customers] AS [c]
+    ) AS [m]
+) AS [t]
+""");
+    }
+
     private void AssertSql(params string[] expected)
         => Fixture.TestSqlLoggerFactory.AssertBaseline(expected);