Question

mysql> select * from table3 order by id;
+------+-------+
| id   | value |
+------+-------+
|    1 | a     |
|    1 | b     |
|    1 | c     |
|    1 | d     |
|    2 | a     |
|    2 | b     |
|    3 | a     |
|    3 | b     |
|    3 | c     |
|    4 | a     |
|    4 | b     |
+------+-------+

I wanted to select all ids that don’t have a value ‘c’.

It will not simply work by following query:

mysql> select distinct id from table3 where value <> 'c';
+------+
| id   |
+------+
|    1 |
|    2 |
|    3 |
|    4 |
+------+

All I need is only 2 and 4 return.

Thanks for your attention!

Answer 1

select distinct id 
from table3 t
where not exists 
                 (select 1 from table3 where value = 'c' and id = t.id)