Dear all,
What set operators other then UNION do PG have?
In particular, I am interested in the MINUS or equivalent operator. e.g
table1:
value1
1
2
3
4
5
6
7
8
9
table2:
value2
1
3
5
7
9
SELECT table1.value1 FROM table1 MINUS table2.value2 FROM table2;
result:
2
4
6
8
I have PG 6.4.0 so please specify what version of PG might have this
functionality... also, can anybody offer hints as to how to implement such
functionality if necessary?
Regards,
Stuart.
+-------------------------+--------------------------------------+
| Stuart Rison | Ludwig Institute for Cancer Research |
+-------------------------+ 91 Riding House Street |
| Tel. (0171) 878 4041 | London, W1P 8BT, UNITED KINGDOM. |
| Fax. (0171) 878 4040 | stuart@ludwig.ucl.ac.uk |
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