与列标识符

我创建一个选择查询与三个表的联合.... 这样与列标识符

select a as A,b as B c as C where c = x union 
select b as A,d as B e as C where e = y and d = a union 
select f as A,g as B,h as C

和查询的结果SQL视图是这样的：

A B C 
=========== 
1 abc ... 
55 def ... 
1 sas ...

所以我希望有一个列可以计算行数，只是为了防止重复标识符。财产以后这样

Row A B C 
================ 
1 1 abc ... 
2 55 def ... 
3 1 sas ...

....

我的问题是如何能够做到？

来源

2012-01-13 jcvegan

看看'ROW_NUMBER（）'在2008 – JonH 2012-01-13 21:20:12

我尝试过，但我还没有看到它在工会上工作 – jcvegan 2012-01-13 21:21:21

你关心你获得行的顺序是什么？如果“行”是一个整数，从1开始并运行到行数，您是否关心？如果没有，还有'NEWID（）'，这可能更容易在这里使用。 – hvd 2012-01-13 21:22:59

CREATE VIEW dbo.vname 
AS 
    SELECT [Row] = ROW_NUMBER() OVER (ORDER BY A), A, B, C FROM 
    (<UNION query here>) AS x;

更换为了通过与任何命令你”喜欢看到应用。请注意，您需要在外部查询中针对dbo.viewname使用ORDER BY来确保Row将按照该顺序出现。

来源

2012-01-13 21:26:12

嘿，这工作很好。谢谢！ – jcvegan 2012-01-13 21:35:33

您可以使用ROW_NUMBER（）这样的：

SELECT ROW_NUMBER() OVER (ORDER BY A,B,C) AS RowNo, * 
FROM 
(
select a as A,b as B c as C where c = x 
union 
select b as A,d as B e as C where e = y and d = a 
union 
select f as A,g as B,h as C 
) x

来源

2012-01-13 21:23:06 AdaTheDev

您可以使用公用表表达式来实现这一目标：

WITH unionTable 
AS 
(
    select a as A, b as B, c as C where c = x union 
    select b as A, d as B, e as C where e = y and d = a union 
    select f as A, g as B, h as C 
) 
SELECT ROW_NUMBER() OVER (ORDER BY A) AS RowNumber, * 
FROM unionTable

来源

2012-01-13 21:23:08 tobias86

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