Multiple ascending order is not working in Mysql

Question

I have one table called as request and there are three columns called as Id, want, teach. I have to display want and teach co

Answer 1

first you need to understand order by

if you give 1st,2nd asc order it will frist asc the 1st column and depend on this it will asc 2nd column. for example

1st  2nd               
1    b
2    d
3    a
2    a
1    a

order by convert in

 1st   2nd 
  1     a
  1     b
  2     a
  2     d
  3     a

So you need to different query

     SELECT want FROM request WHERE want IS NOT NULL OR want !='' GROUP BY 
 want ORDER BY want ASC

     SELECT teach FROM request WHERE teach IS NOT NULL OR teach !='' GROUP
 BY  teach ORDER BY teach ASC