Delete data from two tables

Question

I wish to delete data from two tables i have: staff , and staff_take_courses . the SQLCommand line keeps giving the error:

ERROR 1451 (23000): Cannot delete or update a parent row: a foreign key constraint fails (`Exclusif`.`staff_take_courses`, CONSTRAINT `fk_staff_has_courses_staff1` FOREIGN KEY (`staff_id`) REFERENCES `staff` (`id`) ON DELETE NO ACTION O
N UPDATE NO ACTION)

here is the query:

  delete s, stc from staff s inner join staff_take_courses stc on stc.staff_id = s.id where s.id= '$id';

please help me out

Answer 1

Why can you just delete in two statement:

 DELETE FROM staff_take_courses WHERE staff_take_courses.staff_id= '$id';
 DELETE FROM staff WHERE staff.id= '$id';

There must be a problem with the relationship between the tables. That are not allowing you to delete from the tables

Answer 2

Delete from staff_take_courses where staff_take_courses.staff_id= '$id'; Delete from staff WHERE staff.id= '$id'; OR

Just use INNER JOIN as below

DELETE field1 , field2  FROM staff_take_courses  INNER JOIN staff  
WHERE staff_take_courses.staff_id= staff.id and staff_take_courses.staff_id = '1'

Answer 3

You cannot delete a table from database if that table have relationship with another table it will keep on giving you an error . Why not try to check your relationships?