Question

I have my table: call it tblA THis table has three rows, id, sub-id, and visibility

sub-id is the primary key (it defines taxonomies for id). I’m trying to build a query that selects every id that appears less than three times.

here is an example query/result

select * from tbla where id = 188002;

+--------+--------+-------------+
| sub-id |  id    | visibility  |
+--------+--------+-------------+
| 284922 | 188002 |      2      |
| 284923 | 188002 |      2      |
| 284924 | 188002 |      0      |
+--------+--------+-------------+

From what i’ve seen here and here it looks like I need to join the table on…itself. I dont really understand what that accomplishes.

If anyone has insight into this, it is appreciated. I will continue to research it and update this topic with any additional information I come across.

Thanks

Answer 1

SELECT id
    FROM tbla
    GROUP BY id
    HAVING COUNT(*) < 3