On Tue, 2006-02-21 at 09:57, Ibrahim Tekin wrote: > hi, > i have btree index on a text type field. i want see rows which starts > with certain characters on that field. so i write a query like this: > > SELECT * FROM mytable WHERE myfield LIKE 'john%' > > since this condition is from start of the field, query planner should > use index to find such elements but explain command shows me it will > do a sequential scan. > > is this lack of a feature or i am wrong somewhere? This is an artifact of how PostgreSQL handles locales other than ASCII. If you want such a query to use an index, you need to back up your database, and re-initdb with --locale=C as an argument. Note that you then will NOT get locale specific matching and sorting.
