嗨我需要点帮助。select members.membership_no,members.first_name,members.last_name,employment.position,members.start_date LEFT JOIN employment ON employment.membership_no=members.membership_no limit 10select members.membership_no,members.first
我是数据库新手,我的问题是如何使用复合主键进行删除。下面是我的表结构, DeveloperID int NOT NULL, WorkDate Datetime, Overtime int, Primary key(DeveloperID,ProjectID,WorkDate)
insert into DevProj (DeveloperID,Pro