with ties 什么意思？

[lw1a2]

例如：
select top 50 with ties * from employee order by emp_id
我看了帮助，没看明白

[xluzhong]

相当于
select * from employee where emp_id in(select distinct emp_id from(select top 50 with ties * from employee order by emp_id)t)

[wudan8057]

指定从基本结果集中返回附加的行，这些行包含与出现在 TOP n (PERCENT) 行最后的 ORDER BY 列中的值相同的值。如果指定了 ORDER BY 子句，则只能指定 TOP ...WITH

[lw1a2]

看了楼上的，头更大了

[lw1a2]

wudan8057(开心每一天) 不用粘帮助了，我看不懂

[wudan8057]

相当于下面实现的功能:
select top 0 * into #test from employee

declare @s_empid varchar(20)

declare c_getempid cursor for
select distinct emp_id
(
select top 50 * from employee order by emp_id
) as info
open c_getempid
fetch next from c_getempid into @s_empid
while @@fetch_status = 0
begin
insert #test
select top 50 * from employee where emp_id = @s_empid order by emp_id
fetch next from c_getempid into @s_empid
end
close c_getempid

[亦饮亦歌]

select top 50 with ties * from employee order by emp_id
这句的意思是按emp_id从小到大的顺序取employee的前50条记录,如果第50条的emp_id重复,那么这个emp_id号的记录都取出来,这样取出来的记录就不止50条了

[lw1a2]

我搜了一下，大概明白了

我的例子有点不太好