sql server 中的动态 sql pivot [英] dynamic sql pivot in sql server

问题描述

现在在 sql server 2008 中运行此查询，但很快计划将其移动到在 sql 报告服务中创建报告:

Running this query in sql server 2008 now, but soon plan to move it in creating a report in sql reporting services:

SELECT * from ( SELECT Amount, Year, column1, column2,column3 from BUYSCTE ) BUY 

我的表结果在没有数据透视的查询之上运行是这样的

My table results running above query without the pivot is this

Column1 | Column2 | Column3| FYYear| Amount|

 1           cat     dog      2011   50 
 1           cat     dog      2012   75
 1           cat     dog      2013   65
 2          fish     snake    2011   23
 2          fish     snake    2012   39
 2          fish     snake    2013   59
 .. 
 ..  
 ..                           2016

所以基本上我希望结果是这样的:

so basically I want the results to end up like this:

Column1 | Column2 | Column3| 2011| 2012 | 2013 
 1           cat     dog      50    75     65
 2          fish     snake    23    39     59

所以为了实现这一点，我想出的查询是我首先创建了一个表变量并将其设为动态变量，然后像这样进行了透视，

so the query I came up with to make this happen is I first created a table variable and made it a dynamic variable and did a pivot like this,

declare @Year nvarchar(Max)
set @Year = STUFF(
(SELECT ', ' + quotename(FYYear)
from BUYSCTE Group By FYYear order by
FYYear For XML PATH(''))
, 1, 2, '');

上面用 [2011]、[2012]、[2013]、[2014]、[2015]、[2016] 填充 @Year 值

The above populates the @Year value with: [2011], [2012], [2013], [2014], [2015], [2016]

我知道因为我将上面的选择更改为 SELECT @Year 只是为了检查值是否设置正确

I know that because I change the above select to SELECT @Year just to check if the value is set correctly

从那里我将表变量之后的上述选择更改为

from there I change the above select after the table variable to

SELECT * from ( SELECT Amount, FYYear, column1, column2,column3 from BUYSCTE ) BUY 
PIVOT( SUM(Amount) FOR FYYear in ([@Year]) ) pvt

但我的结果最终是这样的

but my results end up being this

 Column1 | Column2 | Column3| @Year|
 1           cat     dog      null   
 2          fish     snake    null

我做错了什么?似乎我错过了一些我看不到自己的小东西.即使我将聚合函数从 SUM 更改为 COUNT，它也会为 @Year 列值提供 0 而不是 null

What am I doing wrong? it seems like something small I am missing that I cannot see myself. even if I change the aggregate function from SUM to COUNT it gives 0 for the @Year column values instead of null

推荐答案

你已经很接近了，但要让它工作，你必须使用动态 SQL 构造你的 PIVOT 然后执行它.因此，在填充变量 @Year 之后，您需要执行以下操作:

You are close, but for this to work you have to construct your PIVOT using dynamic SQL and then execute it. So, after you populate your variable @Year, you need to do something like this:

DECLARE @Query VARCHAR(MAX)

SET @Query = '
SELECT * from ( SELECT Amount, FYYear, column1, column2,column3 from BUYSCTE ) BUY 
PIVOT( SUM(Amount) FOR FYYear in ('+ @Year + ') ) pvt'

EXEC(@Query)

虽然在这样做之前，您应该先看看这个链接.

Though before doing this, you should take a look at this link.

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