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Editorial Team
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Asked: 2026-06-07T08:51:43+00:00

I am just making a foreign key reference of parent table in a child

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I am just making a foreign key reference of parent table in a child table. When I try to delete the row from the parent table whose reference is there in child table, surprisingly it allows me to delete it. I have tried to create child table explicitly by writing on delete restrict and also without it, but to no help. Any ideas why this is happening? Below is the code I am using while creating the tables.

CREATE TABLE region
(
id int PRIMARY KEY AUTO_INCREMENT,
name varchar(50) NOT NULL
);

CREATE TABLE aggregator
(
id int PRIMARY KEY AUTO_INCREMENT,
name varchar(50) NOT NULL
);

CREATE TABLE gateway
(
id int PRIMARY KEY AUTO_INCREMENT,
name varchar(50) NOT NULL,
region_id int ,
aggregator_id int ,
is_public boolean  DEFAULT 0 NOT NULL,
FOREIGN KEY (region_id) REFERENCES region(id),
FOREIGN KEY (aggregator_id) REFERENCES aggregator(id)
);
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1 Answer

  1. Editorial Team

    Both parent and child table need to be INNODB tables.

    Try:

    CREATE TABLE region
(
id int PRIMARY KEY AUTO_INCREMENT,
name varchar(50) NOT NULL
) ENGINE=INNODB;

CREATE TABLE aggregator
(
id int PRIMARY KEY AUTO_INCREMENT,
name varchar(50) NOT NULL
) ENGINE=INNODB;

CREATE TABLE gateway
(
id int PRIMARY KEY AUTO_INCREMENT,
name varchar(50) NOT NULL,
region_id int ,
aggregator_id int ,
is_public boolean  DEFAULT 0 NOT NULL,
FOREIGN KEY (region_id) REFERENCES region(id),
FOREIGN KEY (aggregator_id) REFERENCES aggregator(id)
) ENGINE=INNODB;
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