新建表c1
CREATE TABLE c1 ( id int(11) NOT NULL auto_increment PRIMARY KEY, kl VARCHAR(255) )
向表c1插入數據
INSERT INTO c1(kl) VALUES ('李'),('周'),('王'),('趙')
新建表c2
CREATE TABLE c2 ( id int(11) NOT NULL auto_increment PRIMARY KEY, kl VARCHAR(255) )
向表c2插入數據
INSERT INTO c2(kl) VALUES ('1'),('1'),('1'),('1')
創建觸發器c1表更新後,同樣更新c2表
create trigger c1_update_c2 after UPDATE on c1 for each ROW BEGIN UPDATE c2 set kl=new.kl where id =(select id from c1 where kl=new.kl); end #select id from c1 where kl=new.kl 查詢更新的值對應的ID的值是
更新表c1的kl值,查看c2對應的值
UPDATE c1 SET kl = '李四' where id=1; SELECT * from c1; SELECT * from c2;