②现要查询TeacherID为“1234”的教师的领导的TeaeheID,请给出相应的SQL语句,要求只使用一条SQL语句

参考答案:

② select T2.LeaderID from Treachers as T1 join Teachers as T2 on TLeaderID=T2.TeacherID where T1 TeacherID=‘1234’② select T2.LeaderID from Treachers as T1 join Teachers as T2 on TLeaderID=T2.TeacherID where T1 TeacherID=‘1234’ 解析：创建表格使用CREATE语句。对于查询表中领导的领