Creating temporary tables in MySQL Stored Procedure

Question

The following procedure gives me an error when I invoke it using the CALL statement:

CREATE DEFINER=`user`@`localhost` PROCEDURE `emp_performance`(id VARCHA         


        

Answer 1

I've tidied it up a little for you and added example code. I always keep my parameter names the same as the fields they represent but prefix with p_ which prevents issues. I do the same with variables declared in the sproc body but prefix with v_.

You can find another one of my examples here:

Generating Depth based tree from Hierarchical Data in MySQL (no CTEs)

drop procedure if exists emp_performance;

delimiter #

create procedure emp_performance
(
in p_employee_id varchar(10)
)
begin

declare v_counter int unsigned default 0;

create temporary table tmp engine=memory select time_in, time_out 
 from attendance where employee_id = p_employee_id;

-- do stuff with tmp...

select count(*) into v_counter from tmp;

-- output and cleanup

select * from tmp order by time_in;

drop temporary table if exists tmp;

end#

delimiter ;

call emp_performance('E123456789');