DELIMITER $$ CREATE TRIGGER prog_no_trigger BEFORE INSERT ON prog_info FOR EACH ROW BEGIN declare newpg_no varchar(16); declare pg_no varchar(16); declare pg_type varchar(4); declare pg_number int; set pg_type = NEW.prog_type; IF NEW.prog_no IS NULL OR NEW.prog_no = '' THEN SELECT MAX(prog_no) into pg_no from prog_info where prog_type = NEW.prog_type; if pg_no is null or pg_no = '' then set newpg_no = CONCAT(pg_type, '000001'); else set pg_number = RIGHT(pg_no,6) + 1; set newpg_no = RIGHT(CONCAT('000000',pg_number),6); SET newpg_no=CONCAT(pg_type,newpg_no); end if; SET NEW.prog_no = newpg_no; END IF; END
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