How to make a Store Procedure that sums in MySQL

here is an example:

CREATE PROCEDURE store_procedure_name
      
AS
BEGIN

      SET NOCOUNT ON;

    WITH A AS
    (
      SELECT field1, field2
      from table1
      where some condition
     )
     
     SELECT sum(field1) as mytotal
     FROM a
     group by field2
   
END
GO

I've got this following your example. SET NOCOUNT ON didn't work, and then it didn't like WITH a AS either. What can be the problem?

Thanks.

BEGIN
       /* It did not recognize this, so I comment it */
	/*SET NOCOUNT ON; */
    
    WITH a AS(
		SELECT 
			IF(AssType = 'install', task.TskHHP * task.TskI_Percentage, task.TskHHP * task.TskR_Percentage) as SubTotal
		FROM
			assignment
			INNER JOIN task ON (assignment.TskCod = task.TskCod)
		WHERE
			AssDate >= '2011-01-01' AND 
			AssDate <= '2011-01-31';
    )
    
    SELECT SUM(SubTotal)
    FROM a;
END

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It worked perfectly ralmada!
Thanks!