0

我的问题：我想要在同一个表和多个表中没有重复的记录？如何在 SQL 中继续执行此操作？

让我解释一下我的尝试：

Select distinct Col1, col2
from Table
where order id = 143

输出

VolumeAnswer1    AreaAnswer1    heightAnswer1
VolumeAnswer2    AreaAnswer1    heightAnswer2
VolumeAnswer3    AreaAnswer1    heightAnswer2

预期输出
它显示了第二个表的副本，但我需要输出如下：

VolumeAnswer1    AreaAnswer1    heightAnswer1
VolumeAnswer2                   heightAnswer2
VolumeAnswer3

对于多个表，我需要相同的场景，也需要为连接找到相同的重复项。如果不能在 SQL Server 中处理，我们如何在 .Net 中处理呢？我使用了多项选择，但他们过去常常在单选中更改它。每一列都应该绑定在下拉列表中......

4

1 回答 1

1

这样的事情可能是一个很好的起点：

;with cte1 as (
Select col1, cnt1
From (
  Select
    col1
    ,row_number() over(Partition by col1 Order by col1) as cnt1
  From tbltest) as tbl_sub1
Where cnt1 = 1
), cte2 as (
Select col2, cnt2
From (
  Select
    col2
    ,row_number() over(Partition by col2 Order by col2) as cnt2
  From tbltest) as tbl_sub2
Where cnt2 = 1
), cte3 as (
Select col3, cnt3
From (
  Select
    col3
    ,row_number() over(Partition by col3 Order by col3) as cnt3
  From tbltest) as tbl_sub3
Where cnt3 = 1
)
Select
col1, col2, col3
From cte1
full join cte2 on col1 = col2
full join cte3 on col1 = col3

Sql Fiddle 展示示例：http ://sqlfiddle.com/#!3/c9127/1

于 2012-07-24T19:05:11.117 回答