mysql - Error when using case with variables -

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hey guys facing problem when use variable case in mysql.

the code have used is

declare vsite varchar(20); set vsite = case   when id > 0 'sdfsdf'   else 'asd' end name  customers;

when run code throws me error 

you have error in sql syntax; check manual corresponds mysql server version right syntax use near 'declare vsite varchar(20)' @ line 1: declare vsite varchar(20)

can point me going wrong..thanks valuable help

you need declare variables inside begin end block.

here simple example of stored procedure

delimiter // create procedure blah(in customer_id int,out vsite varchar(20)) begin  select case when id > 0 'blah' else 'mah' end vsite customers id=customer_id; end// delimiter ;  call blah(3,@somevar); select @somevar;

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