Skip to content

Commit

Permalink
Some minor fixups to #4201 (#4203)
Browse files Browse the repository at this point in the history
  • Loading branch information
roji authored Jan 10, 2023
1 parent 8a94f32 commit 144de46
Showing 1 changed file with 5 additions and 5 deletions.
10 changes: 5 additions & 5 deletions entity-framework/core/querying/single-split-queries.md
Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,7 @@
title: Single vs. Split Queries - EF Core
description: Translating LINQ queries into single and split SQL queries with Entity Framework Core
author: roji
ms.date: 09/01/2023
ms.date: 1/9/2023
uid: core/querying/single-split-queries
---
# Single vs. Split Queries
Expand Down Expand Up @@ -49,7 +49,7 @@ LEFT JOIN [Comment] AS [c] ON [p].[Id] = [c].[PostId]
ORDER BY [b].[Id], [t].[Id]
```

Note that in this query, `Comments` is a collection navigation of `Post`, unlike `Contributors` in the previous query, which was a collection navigation of `Blog`. In this case, a single row is returned for each comment that a blog has (through its posts), and a cross product does not occur.
In this query, `Comments` is a collection navigation of `Post`, unlike `Contributors` in the previous query, which was a collection navigation of `Blog`. In this case, a single row is returned for each comment that a blog has (through its posts), and a cross product does not occur.

### Data duplication

Expand All @@ -70,7 +70,7 @@ ORDER BY [b].[Id]

Examining at the projected columns, each row returned by this query contains properties from both the `Blogs` and `Posts` tables; this means that the blog properties are duplicated for each post that the blog has. While this is usually normal and causes no issues, if the `Blogs` table happens to have a very big column (e.g. binary data, or a huge text), that column would get duplicated and sent back to the client multiple times. This can significantly increase network traffic and adversely affect your application's performance.

If you don't actually need the huge column, it's easy to simply not querying for it:
If you don't actually need the huge column, it's easy to simply not query for it:

```c#
var blogs = ctx.Blogs
Expand All @@ -83,9 +83,9 @@ var blogs = ctx.Blogs
.ToList();
```

By using a projection to explicitly choose which columns you want, you can omit big columns and improve performance; note that this is a good regardless of data duplication, so consider doing it even when not loading a collection navigation. However, this this projects the blog to an anonymous type, the blog isn't tracked by EF and changes to it can't be saved back as usual.
By using a projection to explicitly choose which columns you want, you can omit big columns and improve performance; note that this is a good idea regardless of data duplication, so consider doing it even when not loading a collection navigation. However, since this projects the blog to an anonymous type, the blog isn't tracked by EF and changes to it can't be saved back as usual.

It's worth noting that unlike cartesian explosion, the data duplication caused by JOINs isn't typically significant, as the duplicated data size is negligible; this really is something to worry on mostly if you have big column in your principal table.
It's worth noting that unlike cartesian explosion, the data duplication caused by JOINs isn't typically significant, as the duplicated data size is negligible; this typically is something to worry about only if you have big columns in your principal table.

## Split queries

Expand Down

0 comments on commit 144de46

Please sign in to comment.