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Document MaxBy/MinBy #5259

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27 changes: 27 additions & 0 deletions entity-framework/core/what-is-new/ef-core-11.0/whatsnew.md
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Expand Up @@ -77,6 +77,33 @@ This enhancement removes a significant limitation when modeling complex domain h

For more information on inheritance mapping strategies, see [Inheritance](xref:core/modeling/inheritance).

## LINQ and SQL translation

<a name="linq-maxby-minby"></a>

### MaxBy and MinBy

EF Core now supports translating the LINQ `MaxByAsync` and `MinByAsync` methods (and their sync counterparts). These methods allow you to find the element with the maximum or minimum value for a given key selector, rather than just the maximum or minimum value itself.

For example, to find the blog with the most posts:

```csharp
var blogWithMostPosts = await context.Blogs.MaxByAsync(b => b.Posts.Count());
```

This translates to the following SQL:

```sql
SELECT TOP(1) [b].[Id], [b].[Name]
FROM [Blogs] AS [b]
ORDER BY (
SELECT COUNT(*)
FROM [Post] AS [p]
WHERE [b].[Id] = [p].[BlogId]) DESC
```

Similarly, `MinByAsync` orders ascending and returns the element with the minimum value for the key selector.

## Cosmos DB

<a name="cosmos-transactional-batches"></a>
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