truncate mysql table with foreign key code example

Example 1: cannot truncate a table referenced in a foreign key constraint

SET FOREIGN_KEY_CHECKS = 0; 
TRUNCATE table $table_name; 
SET FOREIGN_KEY_CHECKS = 1;

Example 2: mysql how to truncate table with foreign keys

SET FOREIGN_KEY_CHECKS = 0;

TRUNCATE table1;

SET FOREIGN_KEY_CHECKS = 1;

Example 3: how to force truncate a table in mysql

DELETE FROM mytest.instance;
ALTER TABLE mytest.instance AUTO_INCREMENT = 1;