Help on SQL

The result set we get for ... SELECT col1, col2, col3 FROM tbl1 ORDER BY col1, col2, col3 ... is as shown below : col1 col2 col3 ^^^^ ^^^^ ^^^^ Null Null A Null Null B Null A A Null A B Null B A A A A A A B A B A Is it possible to write a SQL so that the NULL values are pushed to the bottom and the ordering remains the same. The resultant set should be as shown below. col1 col2 col3 ^^^^ ^^^^ ^^^^ A A A A A B A B A Null A A Null A B Null B A Null Null A Null Null B Thanks, Kalyan.