Fatal error: Uncaught PDOException: SQLSTATE[23000]: Integrity constraint violation: 1451 Cannot delete or update a parent row: a foreign key constraint fails (`bcyb`.`clocks2`, CONSTRAINT `clock_id` FOREIGN KEY (`clockNO`) REFERENCES `pointinfo` (`clockNO`)) in /www/wwwroot/www.baichuangwl.com/pointinfo.php:12 Stack trace: #0 /www/wwwroot/www.baichuangwl.com/pointinfo.php(12): PDO->exec('delete from poi...') #1 {main} thrown in /www/wwwroot/www.baichuangwl.com/pointinfo.php on line 12