SQL

disable foreign key constraint mysql

SET FOREIGN_KEY_CHECKS=0;
TRUNCATE TABLE USERS;
SET FOREIGN_KEY_CHECKS=1;

mysql remove foreign key constraint

ALTER TABLE jobs DROP FOREIGN KEY constraint_name 

drop all foreign key constraints mysql

SET foreign_key_checks = 0;

drop foreign key mysql

ALTER TABLE table_name DROP FOREIGN KEY constraint_name

How to drop a foreign key constraint in mysql ?

ALTER TABLE table_name 
DROP FOREIGN KEY constraint_name;
Code language: SQL (Structured Query Language) (sql)

mysql delete table with foreign key

SET FOREIGN_KEY_CHECKS = 0;
drop table if exists customers;
drop table if exists orders;
drop table if exists order_details;
SET FOREIGN_KEY_CHECKS = 1;

mysql - Foreign key constraints: When to use ON UPDATE and ON DELETE

CREATE TABLE COMPANY (
     company_id INT NOT NULL,
     company_name VARCHAR(50),
     PRIMARY KEY (company_id)
) ENGINE=INNODB;

CREATE TABLE USER (
     user_id INT, 
     user_name VARCHAR(50), 
     company_id INT,
     INDEX company_id_idx (company_id),
     FOREIGN KEY (company_id) REFERENCES COMPANY (company_id) ON...
) ENGINE=INNODB;