Hello, My query is like this Select a.field1, a.field2, a.field3From (Select a.field1, b.field2, c.field3 From table1 a Join table2 b on b.something = a.something Join table3 c On c.something = a.something Where a.field7 = 'value' UNION ALL Select a.field4, a.field5, a.field6 From table11 a Join table21 b On b.something = a.something Where a.field8 = 'something' ) aJoin table10 bOn b.field11 = (Select c.field11 From table10 c Where c.field10 = a.field1 ) <- instead of a.field1, if I hardcode value (eg. '100') query runs fasterJoin table21 cOn c.something = a.something...
In the above query, If I substitute a value for a.field1, query runs faster. Any suggestion/guidance/links to improve the query performance without substituting the value ? Happiness Always BKR Sivaprakash
