当没有用 EXISTS 引入子查询时，在选择列表中只能指定一个表达式。
比如 select * from T_Employee where FNumber not in
( select top 5* from T_Employee order by FSalary desc)
order by FSalary 在sql中执行出现错误
更正：select * from T_Employee where FNumber not in
(select top 5 FNumber from T_Employee order by FSalary desc)
order by FSalary
因为：如果要用in,你后面select必须能只能由一个列组成，你的select后面跟了n个列，自然报那个错误了
如果是多个列
select * from A where exists(
select b from tab where A.b = tab.B and A.b2 = tab.B2)