Hi,
This probably reflects my confusion with how self joins work.
Suppose we have this table:
=# SELECT * FROM tmp;a | b
---+---1 | 22 | 34 | 5
(3 rows)
If I want to get a table with records where none of the values in column
b are found in column a, I thought this should do it:
=# SELECT * FROM tmp t1, tmp t2 WHERE t2.b <> t1.a;a | b | a | b
---+---+---+---1 | 2 | 1 | 21 | 2 | 2 | 31 | 2 | 4 | 52 | 3 | 2 | 32 | 3 | 4 | 54 | 5 | 1 | 24 | 5 | 2 | 34 | 5 | 4 |
5
(8 rows)
I need to get:
a | b | a | b
---+---+---+---1 | 2 | 1 | 24 | 5 | 4 | 5
Or just:
a | b
---+---1 | 2 4 | 5
--
Seb
