Am Freitag, 23. Juli 2004 17:24 schrieb Jouneau Luc: > I didn't notice it when I red the doc, but if I create the index as > specified then it is the query with equal operator which use a seq scan. > Do I have to create 2 indexes on the same column (with different datatype) > in order to support different kind of queries ?
Yes. > Well, It seems quite strange to me : > Suppose you have an user interface in which user can parameter his query on > 4 varchar fields (independantly, i.e field 4 does not need to have field > 1,2 or 3 filled), and you allow to use generic character such as '*' or '?' > (which will be translated into '%' and '_'). User can also fill in exact > values. I think that kind of interface would use the LIKE operator no matter whether the user entered wildcards or not. > It would also mean that support both exact generic queries double the > indexing task on update/insert/delete. Well, if you want to optimize lots of different queries, the system needs to provide lots of different support. -- Peter Eisentraut http://developer.postgresql.org/~petere/ ---------------------------(end of broadcast)--------------------------- TIP 3: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly
