我的SQL查询涉及多个表

Question

I have 2 tables. First table stores id in multiple column whose value is stored in other table. I want a query that returns result which has structure of my 1st table but values from 2nd table. To be more specific let's say I have a table like this:

Table A :

        Uniqueid  song_1  song_2 song_3 song_4 song_5
           1        2       4     5        6      8

Table B :

                  song_id    song_name
                     1         abcd
                     2         def
                     3         efg
                     4         ghi
                     5         abdal
                     6         nsadln
                     7         knwldn
                     8         jdkabdb

I want to fetch data from Table A but it should look like:

Desired result:

        Uniqueid  song_1  song_2  song_3    song_4   song_5
           1       def      ghi   abdal      nsadln  jdkabdb

I have used join and making objects but no luck so far. Please help me out.

Answer 1

Just use a bunch of left joins to get to your answer:

SELECT
    a.UniqueId
    ,s1.song_name as song_1
    ,s2.song_name as song_2
    ,s3.song_name as song_3
    ,s4.song_name as song_4
    ,s5.song_name as song_5
FROM
    TableA a
    LEFT JOIN TableB s1
    ON a.song_1 = s1.song_id 
    LEFT JOIN TableB s2
    ON a.song_2 = s2.song_id
    LEFT JOIN TableB s3
    ON a.song_3 = s3.song_id 
    LEFT JOIN TableB s4
    ON a.song_4 = s4.song_id
    LEFT JOIN TableB s5
    ON a.song_5 = s5.song_id