Question

SELECT *
  FROM myTable m
 WHERE m.userId = :userId
   AND m.X = (SELECT MAX(X) 
                FROM myTable m
               WHERE m.userId = :userId 
                 AND m.contactNumber = :contactNumber)";

The problem is,second part of statement evaluates to null in case no such row is present and the statement fails to execute.I want the result to be empty in such a case.

One way to solve this problem is to do expensive filesort(order by) and then fetch the required field at code level. Any better solution to this problem ?

Answer 1

Can you use ISNULL?

and m.X = ISNULL(, ”)