![]() ![]() 'ALTER TABLE products ENGINE=InnoDB ' 'ALTER TABLE sales ENGINE=InnoDB 'īut after making them InnoDB, the reference still does not work when I delete product, related productid in sales table becomes NULL. Set two foreign keys with on update cascade, on delete set null. All children of the parent row are killed (deleted), too. Tape table has two foreign keys referring to Customer and Movie. 6 Answers Sorted by: 219 If you like the Parent and Child terms and you feel they are easy to be remembered, you may like the translation of ON DELETE CASCADE to Leave No Orphans Which means that when a Parent row is deleted (killed), no orphan row should stay alive in the Child table. When you are done, export the database as a SQL file then submit this SQL file to Blackboard. You need to set up primary key and foreign key each table. ![]() Alternatively, you can also trigger sql query for the same. Using phpMyAdmin to create a database with six tables. I run this query to change engine to InnoDB as reference on delete cascade were not working in MyISAM. DELETE CASCADE specified rows will be deleted when the referenced rows are deleted. A foreign key with cascade delete can be created using either a CREATE TABLE statement or an ALTER TABLE statement. This is called a cascade delete in SQL Server. These 2 tables were created with this query as MyISAM. Step 3: Now add the foreign key constraint back again, this time with ON DELETE CASCADE. A foreign key with cascade delete means that if a record in the parent table is deleted, then the corresponding records in the child table will automatically be deleted. REFERENCES products(productid) ON UPDATE CASCADE ON DELETE RESTRICT `salesid` int(10) NOT NULL AUTO_INCREMENT PRIMARY KEY `productid` int(10) NOT NULL AUTO_INCREMENT PRIMARY KEY, Most probably when I drop table foreign references remain somewhere in schemas. Then I tried to add that table, but it does not add. I generally use Heidisql control panel for doing these actions. ![]() Moreover, I tried to drop one empty table with foreign key reference and engine MyISAM. How to add on delete cascade and on update restrict using phpmyadmin Asked 10 years, 7 months ago Modified 7 months ago Viewed 60k times 33 I want to add ' On delete cascade and on update restrict' on foreign keys through phpmyadmin user Interface instead of executing query. I tried to alter table engine to InnoDB, but even if it is set to InnoDB the foreign references does not work. The primary key is being deleted even if it is used elsewhere as foreign key. However, I set my engine MyISAM so this reference does not work. There are two ways of editing these relations, with the relation view and the drag-and-drop designer both of which are explained on this page. I have created database tables with foreign key reference ON UPDATE CASCADE ON DELETE RESTRICT. phpMyAdmin allows relationships (similar to foreign keys) using MySQL-native (InnoDB) methods when available and falling back on special phpMyAdmin-only features when needed. ![]()
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