On Wed, 2002-10-16 at 09:19, Karel Zak wrote: > > Hi, > > I have SQL query: > > SELECT * FROM ii WHERE i1='a' AND i2='b'; > > There're indexes on i1 and i2. I know best solution is use one > index on both (i1, i2). > > The EXPLAIN command show that optimalizer wants to use one index: > > test=# explain SELECT * FROM ii WHERE i1='a' AND i1='b'; > QUERY PLAN > --------------------------------------------------------------------------------- > Index Scan using i1 on ii (cost=0.00..4.83 rows=1 width=24) > Index Cond: ((i1 = 'a'::character varying) AND (i1 = 'b'::character varying))
I think you typo'd. i1='a' AND i1='b' turns into 'a' = 'b' which certainly isn't true in any alphabets I know of. -- Rod Taylor ---------------------------(end of broadcast)--------------------------- TIP 5: Have you checked our extensive FAQ? http://www.postgresql.org/users-lounge/docs/faq.html
