Using in paramenter in subquery? - mysql

Question

Is posible to using in paramenter in subquery?
I'm trying to join three table, and using paramenter in subquery, but I'm getting error:
drop procedure if exists displayFilmInfo;
delimiter //
create procedure displayFilmInfo(in in_category_id tinyint, in in_language_id tinyint)
begin
if in_category_id != 0 and in_language_id != 0 then
select film.title, after_category.name from film
inner join film_category on film_category.film_id = film.film_id
inner join (
select category_id, name from category when category.category_id = in_category_id
) after_category on after_category.category_id = film_category.category_id
inner join (
select language_id, name from language when in_language_id = language.language_id
) after_language on after_language.language_id = film.language_id
end if;
end //
delimiter ;
call displayFilmInfo();
It show:
Query OK, 0 rows affected, 1 warning (0.00 sec)
ERROR 1064 (42000): You have an error in your SQL syntax; check the
manual that corresponds to your MySQL server version for the right
syntax to use near 'when category.category_id = in_category_id
) after_category on afte' at line 8 ERROR 1305 (42000): PROCEDURE sakila.displayFilmInfo does not exist

Answer 1

Please update your select statement to -
select film.title,
after_category.name
from film
inner join film_category on film_category.film_id = film.film_id
inner join (select category_id,
name
from category
where category.category_id = in_category_id) after_category on after_category.category_id = film_category.category_id
inner join (select language_id,
name
from language
where in_language_id = language.language_id) after_language on after_language.language_id = film.language_id