ALTER TABLE `list_student_year_log` CHANGE `serial_lsl` `serial_lsl` INT(11) NOT NULL AUTO_INCREMENT; 

ALTER TABLE `preaproved_student` ADD `modification_date_pst` DATETIME NULL DEFAULT NULL AFTER `preaproved_pst`; 

ALTER TABLE `list_student_year`  ADD `activity_lsy` ENUM('CREATE','DROOP') NOT NULL DEFAULT 'CREATE'  AFTER `serial_usr`;

ALTER TABLE `list_student_year` DROP `activity_lsy`;