Question

I’m looking to join a 2 tables but the second table has a one to many relation. Can I omit the entire row if any of the lines have a certain value? Let me explain more.

User table

id name email
1  bob  [e-mail]
2  foo  [e-mail]


Music table

id userId
1  1
1  2
2  1
3  1
2  2

Say I don’t want it to show the user if he has a relation to music table id 2. Also looking for distinct user.

If I try something like this it will still show both users.

SELECT * FROM users u LEFT JOIN music m ON u.id = m.userId WHERE m.id <> 3

I want it to check all the rows and if it has the id 3, it won’t show. I hope I made sense. Thanks a lot.

Answer 1

Try using sub query like this:

SELECT * FROM users
WHERE id NOT IN (SELECT userId FROM music WHERE id=3)

This query means to select all users if their id is not related with music.id 3.