Question

declare c int 
set c = 1
while c<700 do
update users set profile_display_name = concat(substring(first_name,1,1), last_name) 
        where profile_display_name is null and id between ((c-1)*10000+1) and (c*10000);
SET c = c+1;
End while ;

I am getting error. near declare and end while statement. Where am I making mistake??

Answer 1

This Works much better for me

DELIMITER $$

CREATE DEFINER=`ops`@`localhost` PROCEDURE `myproc`()
BEGIN
DECLARE c INT;
SET c = 1;
WHILE c < 700 DO 
SELECT CONCAT('Loop #:', c) ;

update users 
set profile_display_name = concat(substring(first_name,1,1), last_name) 
where (profile_display_name is null or profile_display_name = '')
and id between ((c-1)*10000+1) and (c*10000); 

commit;

SET c=c+1; 

END WHILE;
END