Re: CREATE INDEX .. ON table1 (field1 asc, field2 desc)
| От | Martijn van Oosterhout |
|---|---|
| Тема | Re: CREATE INDEX .. ON table1 (field1 asc, field2 desc) |
| Дата | |
| Msg-id | 20020825100056.C15448@svana.org обсуждение исходный текст |
| Ответ на | CREATE INDEX .. ON table1 (field1 asc, field2 desc) (Timur <itvthor@sdf.lonestar.org>) |
| Ответы |
Re: CREATE INDEX .. ON table1 (field1 asc, field2 desc)
|
| Список | pgsql-general |
On Sat, Aug 24, 2002 at 08:18:25PM +0500, Timur wrote: > Hello! > > I am new to PostgreSQL and databases in general, and I have this > question: why it is not possible to specify ordering when creating an > index? > > Let's say I have a query which looks like this: > SELECT * FROM table1 > ORDER BY field1, field2 DESC > LIMIT 100; > > Apparently, system won't use index ON (field1, field2) .. It will if you do: SELECT * FROM table1 ORDER BY field1 DESC, field2 DESC LIMIT 100; Time to go read that SQL book again? -- Martijn van Oosterhout <kleptog@svana.org> http://svana.org/kleptog/ > There are 10 kinds of people in the world, those that can do binary > arithmetic and those that can't.
В списке pgsql-general по дате отправления: