SQL Server：连接三个表并返回空记录

Question

I don't know how to join this tree tables for the expected result. I was testing with LEFT / RIGHT / INNER / OUTER joins but i can get the row with the "null" value.

I was playing wiht this tables:

Games Table:

Title    id
------------
Halo     1
Portal   2
Mario    3

Genres Table:

Name     id
------------
Action   1
FPS      2
MMO      3
Arcade   4
Puzzle   5

Genres for games table:

GameId     GenreId
------------------
1          1
1          2
3          5

This is what i get:

Title       Genre
-----------------
Halo        Action
Halo        FPS
Mario      Puzzle

This is the result i want:

Title       Genre
-----------------
Halo        Action
Halo        FPS
Portal      NULL
Mario      Puzzle

Note: I read this question: SQL Server : Join Two Tables and Return With Null Records but no helps me.

Please, some kind of help!

Answer 1

You need left (outer) joins to do this:

SELECT Games.Title, Genres.Name
FROM Games
LEFT JOIN GameGenres ON Games.Id = GameGenres.GameId
LEFT JOIN Genres ON GameGenres.GenreId = Genres.Id