摘要:
联合查询使用关键子union,用于在多个表种查询信息,并且信息类型相同的查询! union 关键子用于联合查询 如: (select *from student where student.score>10 limit 1)union all(select * from student where 阅读全文
摘要:
MySQL中 date表示只有日期; insert into stu values(id = null, birthday = '2000-01-11'); datetime则还包含了时间; insert into testdate values(id = null, birthday = '199 阅读全文