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Add a note on querying shared columns #3321

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Jul 9, 2021
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Add a note on querying shared columns #3321

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Add note on querying shared columns
joakimriedel Jul 9, 2021
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Update entity-framework/core/modeling/inheritance.md
joakimriedel Jul 9, 2021
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3 changes: 3 additions & 0 deletions entity-framework/core/modeling/inheritance.md
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Expand Up @@ -55,6 +55,9 @@ By default, when two sibling entity types in the hierarchy have a property with

[!code-csharp[Main](../../../samples/core/Modeling/FluentAPI/SharedTPHColumns.cs?name=SharedTPHColumns&highlight=9,13)]

> [!NOTE]
> Some database providers, such as SQL Server, will not automatically use the discriminator predicate when querying shared columns using a cast. The query `Url = (blob as RssBlog).Url` would also return the `Url` value for the sibling `Blog` rows. To restrict the query to `RssBlog` entities in the hierarchy you need to add a filter manually on the discriminator, such as `Url = blob is RssBlog ? (blob as RssBlog).Url : null`.
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## Table-per-type configuration

> [!NOTE]
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