mysql on delete cascade

I been trying to run this example but the constrains are not holding

CREATE TABLE parent (
  id INT NOT NULL,
  PRIMARY KEY (id)
);

CREATE TABLE child
(
 id INT,
 parent_id INT,
 FOREIGN KEY (parent_id) REFERENCES parent(id)
 ON DELETE CASCADE
);


If I delete the parent_id from parent then any id match the deleted id should be deleted from the child table but it is not  Please advice!

Thanks
BaderEXAsked:
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Hugo88Commented:
Hi,

you are on the right way. You should execute "show create table child;" to check if the statement was applied successful.

Usully InnoDB is used for these matters. If you don't have InnoDB as default storage engine, specify it in the create statement. It is also a good idea to use a primary key in the child table, but it is not neccessary. Which MySQL version do you use ?


CREATE TABLE parent (
  id INT NOT NULL,
  PRIMARY KEY (id)
)engine=InnoDB ;

CREATE TABLE child
(
 id INT,
 parent_id INT,
 FOREIGN KEY (parent_id) REFERENCES parent(id)
 ON DELETE CASCADE
)engine=InnoDB;
0

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