-----Original Message----- From: Dmitry Teslenko [mailto:dteslenko@xxxxxxxxx] Sent: Thursday, August 14, 2008 6:57 AM To: pgsql-general@xxxxxxxxxxxxxx Subject: Strange query plan Hello! I have following table: CREATE TABLE table1 ( field1 INTEGER NOT NULL, field2 INTEGER NOT NULL, field3 CHARACTER(30), ... some more numeric fields) I have also those indexes: CREATE UNIQUE INDEX idx1 ON table1 USING btree (field3, field2, field1) CREATE INDEX idx2 ON table1 USING btree (field1, field3) Then I query this table with something like this: SELECT SUM(...) FROM table1 WHERE field3 = 'ABC' AND field1 <> 1 GROUP BY field2 And planner picks up a sequential scan of a table. Why does he? [I.N.] How big is your table? If it's not too big, the cost of table scan might be lower than using index. Igor
