foreign key mySql
CREATE TABLE parent (
id INT NOT NULL,
PRIMARY KEY (id)
) ENGINE=INNODB;
CREATE TABLE child (
id INT,
parent_id INT,
INDEX par_ind (parent_id),
FOREIGN KEY (parent_id)
REFERENCES parent(id)
ON DELETE CASCADE
) ENGINE=INNODB;mysql workbench primary key
create table MODULES
(
MODULE_CODE varchar(10) character set utf8mb4 not null,
MODULE_NAME varchar(50) character set utf8mb4 not null,
primary key(MODULE_CODE)
);Copyright © 2021 Codeinu
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