查询的几个操作
select distinct sex from stuInfo//查询不重复的
select top 3 * from stuInfo//查询表的前三行
select top 30 percent * from stuInfo//查询表的前边的百分之三十行
select top 2 * from stuInfo order by NEWID()
select distinct sex from stuInfo//查询不重复的
select top 3 * from stuInfo//查询表的前三行
select top 30 percent * from stuInfo//查询表的前边的百分之三十行
select top 2 * from stuInfo order by NEWID()