How to remove constraints from my MySQL table?

Question

I want to remove constraints from my table. My query is:

ALTER TABLE `tbl_magazine_issue` 
DROP CONSTRAINT `FK_tbl_magazine_issue_mst_users`

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Answer 1

I had the same problem and I got to solve with this code:

ALTER TABLE `table_name` DROP FOREIGN KEY `id_name_fk`;
ALTER TABLE `table_name` DROP INDEX  `id_name_fk`;

Answer 2

There is no such thing as DROP CONSTRAINT in MySQL. In your case you could use DROP FOREIGN KEY instead.

Answer 3

There is no DROP CONSTRAINT In MySql. This work like magic in mysql 5.7

ALTER TABLE answer DROP KEY const_name;

Answer 4

this will works on MySQL to drop constraints

alter table tablename drop primary key;

alter table tablename drop foreign key;

Answer 5

If the constraint is not a foreign key, eg. one added using 'UNIQUE CONSTRAINT (colA, colB)' then it is an index that can be dropped using ALTER TABLE ... DROP INDEX ...

Answer 6

Also nice, you can temporarily disable all foreign key checks from a mysql database: SET FOREIGN_KEY_CHECKS=0; And to enable it again: SET FOREIGN_KEY_CHECKS=1;