Question

I have two tables:

First:
id | title 
1  | aaa
2  | bbb
3  | ccc

Second:
id | first_id | one | two | three | four
1  |    1     | 3   | 1   | 4     | 6
2  |    2     | 4   | 4   | 1     | 2
3  |    3     | 1   | 2   | 3     | 4

and i would like show:

id | title | min | max 
1  | aaa   |  1  | 6
2  | bbb   |  1  | 4
3  | ccc   |  1  | 4

Is this possible with SQL? How? 🙂

Answer 1

Read Tom’s answer, this would be the best to do.

Anyway, and shame on me :

SELECT f.id, f.title
 MIN(LEAST(s.one, s.two, s.three, s.four)) as min,
 MAX(GREATEST(s.one, s.two, s.three, s.four)) as max
 FROM First f
 INNER JOIN Second s on f.id = s.first_id
 GROUP BY f.id, f.title

you can remove MIN and MAX (and Group by) if Second can’t have many rows with same first_id.