摘要: 1、case…when…then的使用create table score(name varchar(30) not null,subject varchar(30) not null,score tinyint unsigned not null)engine = myisam default c... 阅读全文
posted @ 2015-05-29 13:29 liwuming 阅读(111) 评论(0) 推荐(0) 编辑