T-SQL中的数据透视 [英] Pivot data in T-SQL
问题描述
我有一群人.我们称它们为A,B,C.我有一张桌子,显示每个月要付给他们多少钱....
I have a group of people. Lets call them A,B,C. I have a table that shows how much they were paid each month....
PERSON|MONTH|PAID
A JAN 10
A FEB 20
B JAN 10
B FEB 20
B SEP 30
C JAN 10
C JUNE 20
C JULY 30
C SEP 40
此表可以并且确实可以持续多年..
THIS table can and does go on for years and years..
是否有一种方法可以使该表旋转(在我看来,实际上不需要汇总,通常在数据透视中完成)?
Is there a way to pivot this table (nothing as I see really needs to be aggregated which is usually done in pivots) In a table that looks like the following?
JAN FEB MAR APR MAY JUN JUL AGU SEP
A 10 20
B 10 20 - - - - - - 30
C 10 - - - - 20 30 - 40
以前没有遇到过这样的事情,但是假设任何想法都是一个普遍的问题吗?
Haven't run into something like this before but assume it is a common problem any ideas?
推荐答案
如果您使用的是SQL Server 2005(或更高版本),则代码如下:
If you are using SQL Server 2005 (or above), here is the code:
DECLARE @cols VARCHAR(1000)
DECLARE @sqlquery VARCHAR(2000)
SELECT @cols = STUFF(( SELECT distinct ',' + QuoteName([Month])
FROM YourTable FOR XML PATH('') ), 1, 1, '')
SET @sqlquery = 'SELECT * FROM
(SELECT Person, Month, Paid
FROM YourTable ) base
PIVOT (Sum(Paid) FOR [Person]
IN (' + @cols + ')) AS finalpivot'
EXECUTE ( @sqlquery )
无论您拥有多少种不同的状态,这都将起作用.它使用PIVOT
动态组装查询.使用动态列执行PIVOT的唯一方法是动态组装查询,这可以在SQL Server中完成.
This will work no matter how many different status you have. It dynamically assembles a query with PIVOT
. The only way you can do PIVOT with dynamic columns is by assembling the the query dynamically, which can be done in SQL Server.
其他示例:
- SQL Server PIVOT perhaps?
- How do I build a summary by joining to a single table with SQL Server?
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