在tsql中使用Sum函数进行数据透视 [英] Pivoting with Sum function in tsql

问题描述

我有以下格式的数据

Client       Business Unit    Year  Quarter     USD Amt
BalckRock    Pricing          2010  Q1          234
BalckRock    Pricing          2010  Q2          343
BalckRock    Pricing          2010  Q3          545
BalckRock    Pricing          2010  Q4          5435
BalckRock    Pricing          2011  Q1          5425
BalckRock    Pricing          2011  Q2          3524
BalckRock    Pricing          2011  Q3          54
BalckRock    Pricing          2011  Q4          5425
BalckRock    Pricing          2012  Q1          545
BalckRock    Pricing          2012  Q2          5445
BalckRock    Pricing          2012  Q3          545
BalckRock    Pricing          2012  Q4          4545
BalckRock    Sales            2010  Q1          23
BalckRock    Sales            2010  Q2          3434
BalckRock    Sales            2010  Q3          4234
BalckRock    Sales            2010  Q4          4234
BalckRock    Sales            2011  Q1          3423
BalckRock    Sales            2011  Q2          1
BalckRock    Sales            2011  Q3          1341
BalckRock    Sales            2011  Q4          434
BalckRock    Sales            2012  Q1          421
BalckRock    Sales            2012  Q2          42
BalckRock    Sales            2012  Q3          434
BalckRock    Sales            2012  Q4          4214

我希望它具有以下格式

Client        Business Unit    2010    2011    2012
BalckRock     Pricing          6557    14428   11080
BalckRock     Sales            11925   5199    5111

基本上，美元是每年的总和，但以年为列标题

Basically the sum of USD amnt year wise, but years as the column heading

有人可以帮我吗?

推荐答案

您可以轻松地使用

You can easily use a PIVOT for this. As the other have said you can use a Static Pivot that you code the columns that you want or you can use a Dynamic Pivot, which get the list of columns at run-time.

静态枢轴(请参见 Sql Fiddle for Demo )

select *
from
(
  select client, businessunit, year, USD_Amount
  from t
) x
pivot
(
  sum(USD_Amount)
  for year in ([2010], [2011], [2012])
) p

但是，为此，我可能会建议您使用动态Pivot，这样您在进入新的一年时就不必更改代码. (请参见带有演示的Sql Fiddle )

But for this, I might recommend a dynamic Pivot so you don't have to change you code when you get into a new year. (See Sql Fiddle with Demo)

DECLARE @cols AS NVARCHAR(MAX),
    @query  AS NVARCHAR(MAX)


select @cols = STUFF((SELECT distinct ',' + QUOTENAME(year) 
                    from t
            FOR XML PATH(''), TYPE
            ).value('.', 'NVARCHAR(MAX)') 
        ,1,1,'')

set @query = 'SELECT client, businessunit, ' + @cols + ' from 
             (
                select client, businessunit, year, USD_Amount
                from t
            ) x
            pivot 
            (
                sum(USD_Amount)
                for year in (' + @cols + ')
            ) p '

execute(@query)

两个查询都将产生相同的结果.但是，动态枢轴的优势在于，当您拥有其他年份的数据时，则不必更新查询以包括这些字段.查询的第一部分获取表中的distinct years列表，然后使用该years列表确定您要查找的SUM.

Both queries will produce the same results. However, the plus with the dynamic pivot is that when you have data from additional years, you will not have to update the query to include those fields. The first part of the query gets the list of the distinct years in your table, it then uses that list of years to determine the SUM that you are looking for.

这篇关于在tsql中使用Sum函数进行数据透视的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！