mysql - Can not set FOREIGN KEY with DELETE ON CASCADE -


i delete referencing data foreign key.

here 2 of datatables:

create table `specification_variant_parent` (   `specification_variant_parent_id` int(11) unsigned not null auto_increment,   `sort_order` tinyint(3) unsigned not null,   primary key (`specification_variant_parent_id`) ) engine=innodb;   create table `specification_variant_parent_description` (   `specification_variant_parent_id` smallint(5) unsigned not null,   `language_id` tinyint(3) unsigned not null,   `name` varchar(64) collate utf8mb4_unicode_ci not null,   primary key (`specification_variant_parent_id`,`language_id`),   key (`specification_variant_parent_id`)   references specification_variant_parent (specification_variant_parent_id) on delete cascade ) engine=innodb;

when fire in phpmyadmin says:

error in foreign key constraint of table database/specification_variant_parent_description: foreign key (specification_variant_parent_id) references specification_variant_parent (specification_variant_parent_id) on delete cascade ) engine=innodb: cannot find index in referenced table referenced columns appear first columns, or column types in table , referenced table not match constraint.

what wrong database scheme?

your datatypes not match.

in first table have

`specification_variant_parent_id` int(11) unsigned not null auto_incremen

the datatype declare unsigned int

in second table foreign key is

`specification_variant_parent_id` smallint(5) unsigned not null

and datatype unsigned smallint

make both of them same datatype.


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