Where error in add FOREIGN KEY in phpmyadmin? [duplicate]

Possible Duplicate:
Setting up foreign keys in phpMyAdmin?

ALTER table podcategory add FOREIGN KEY (category_id) 
           REFERENCES category(category_id)
ON UPDATE RESTRICT
ON DELETE CASCADE

When i send script in phpmyadmin i get error

Can't create table './C292729_T25027/#sql-be0_30ed238.frm' (errno: 150)

How to add this FOREIGN KEY?

출처 phpmyadmin foreign-keys

make sure your db engine is InnoDB and reference column is indexed column. check this answer setup foreign key - Nikson Kanti Paul
table have indexes and InnoDb - Strannik

try this type:

ALTER TABLE `aaaa` ADD CONSTRAINT fk_comp_id FOREIGN KEY ( `comp_id` ) REFERENCES `comps` ( `id` );

Or this SO answer/question might be able to help you out for sure: Setting up foreign keys in phpMyAdmin?

what is fk_comp_id ? - Strannik
an example, you can replace it by your own index as you like. - Rob
#1005 - Can't create table './C292729_T25027/#sql-be0_30ee499.frm' - Strannik
here fk_comp_id is the name of the index, - Nikson Kanti Paul
@strannik for the 1005 error, check out this item: stackoverflow.com/questions/9937490/… - Rob