Delete all foreign keys in database(MySql)

Question

I would like to rename a column in a table that is a foreign key to many tables. Apparently this is only possible if you delete the constraints, as I found out in this link.

Answer 1

The following query will build the correct syntax automatically. Make sure you put your real DB schema name in the WHERE condition. Just execute each line returned and all your FOREIGN KEYS will be gone.

I leave the reverse (adding them back) as an exercise for you.

SELECT CONCAT("alter table ", TABLE_NAME," drop foreign key ", CONSTRAINT_NAME,"; ") AS runMe
FROM information_schema.key_column_usage 
WHERE TABLE_SCHEMA='MY_SCHEMA_NAME' AND CONSTRAINT_NAME <> 'PRIMARY';

If you need it to be schema independent, you can write: TABLE_SCHEMA=DATABASE() to get the current active DB name