* Hassan Shaikh > Which one of the following statements is more efficient? > > SELECT * FROM COUNTRY WHERE LEFT(CNNAME,1)='B'; > > Or > > SELECT * FROM COUNTRY WHERE CNNAME LIKE 'B%';
The second statement will normally be the most effective, because the server don't need to perform a function on the column for each row. However, the LIKE operator is relatively "heavy", the _most_ effective in this case is probably: SELECT * FROM COUNTRY WHERE CNNAME>='B' AND CNNAME<'C' or SELECT * FROM COUNTRY WHERE CNNAME BETWEEN 'B' AND 'Bzzz' -- Roger -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
