在mysql php中加入2个表的查询

Question

i have two table in database like following

table 1 : playlist

id    name    user_id
1     test1    3
2     test2    4
3     test3    3

table 2 : playlist_shared

id    playlist_id    user_id
1     1              6
2     1              3
3     2              3

now i want to select unique id and name of playlist from playlist table where user_id=3 in both table.

output will be

 id    name
 1     test1
 2     test2
 3     test3

please help me to short out this.

Answer 1

select id,name from playlist where user_id = 3
union
select p.id id, name 
     from (select * from playlist_shared where user_id=3) ps join playlist p 
     on p.id = ps.playlist_id