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CREATE TABLE parent ( id INT NOT NULL AUTO_INCREMENT, PRIMARY KEY (id) ); CREATE TABLE child ( id INT NOT NULL AUTO_INCREMENT, parent_id INT, INDEX par_ind (parent_id), FOREIGN KEY (parent_id) REFERENCES parent(id) ON DELETE CASCADE ); It's true that if your primary key is just a identity value auto incremented, you would have no real use for ON UPDATE CASCADE.
In reference to #4, if you change the child ID to something that doesn't exist in the parent table (and you have referential integrity), you should get a foreign key error. If you follow database design best practices and your primary key is never updatable (which I think should always be the case anyway), then you never really need the clause.
Zed made a good point, that if you use a natural key (e.g.
Note: Non-genuine replacement displays may have compromised visual quality and may fail to work correctly.As a result, if any meetings from the original pattern contained data, Groove gives you the option to save these meetings as individual, non-recurring meetings, and thus avoid any data loss. Update kelimesi cümlede isim olarak "güncelleştirme, güncel veriler, modernleştirme" anlamına gelmektedir.This process can be used to verify that the phone is properly configured to launch any custom demo applications.After you activate retail mode, you must first provision demo content before you can use retail mode.