爱安敝之的博客

创建表SC： CREATE TABLE SC(SNO CHAR(7), CNO CHAR(10), GRADE SMALLINT CHECK(GRADE>0))\G 添加元素到SC： INSERT INTO SC(SNO,CNO,GRADE) VALUES("9512101","C03","95")\g INSERT INTO SC(SNO,CNO,GRADE) VALUES("9512103,"C03","51\g INSERT INTO SC(SNO,CNO,GRADE) VALUES(.