Question

我有下表

 SpareParts | JPY  | INR  | SGD  | IDR  |

   sp1         1      25     75    200
   sp2         4      33     35    400 
   sp3         5      44     77    200

我想要像BELOW一样放弃

   SpareParts  | currency  |  value

     sp1           JPY         1
     sp1           INR         25
     SP1           SGD         74
     SP1           IDR         200

     sp2           JPY         4
     sp2           INR         33
     SP2           SGD         35
     SP2           IDR         400

     sp3           JPY         5
     sp3           INR         44
     SP3           SGD         77
     SP3           IDR         200

请帮我解决这个问题。

Answer 1

您尝试的操作通常称为UNPIVOT。虽然SQL Server提供UNPIVOT作为操作，但我发现以下模式通常更有效;

;WITH SpareParts (SpareParts, JPY, INR,SGD, IDR) AS
(
   SELECT 'sp1', 1, 25, 75, 200 UNION ALL
   SELECT 'sp2', 4, 33, 35, 400 UNION ALL
   SELECT 'sp3', 5, 44, 77, 200  
)
SELECT   SP.SpareParts
        ,CA.*
FROM SpareParts SP
CROSS 
APPLY   (
            SELECT 'JPY', JPY   UNION ALL
            SELECT 'INR', INR   UNION ALL
            SELECT 'SGD', SGD   UNION ALL
            SELECT 'IDR', IDR
        )       CA (Currency, [Value])

Answer 2

以下是使用UNPIVOT对您的数据进行格式化的示例：

-- create a temp table with your sample data
SELECT * INTO #temp
FROM  
    (SELECT 'sp1' as spareParts, 1 as JPY, 25 as INR, 75 as SGD, 200 as IDR
     UNION
     SELECT 'sp2' as spareParts, 4 as JPY, 33 as INR, 35 as SGD, 400 as IDR
     UNION
     SELECT 'sp3' as spareParts, 5 as JPY, 44 as INR, 75 as SGD, 200 as IDR) as t

-- output the sample data in current format
SELECT * FROM #temp

-- preform the unpivot and show reformatted data
SELECT SpareParts, Currency, Value
FROM 
   (SELECT SpareParts, JPY, INR, SGD, IDR
   FROM #temp) t
UNPIVOT
   (Value FOR Currency IN 
      (JPY, INR, SGD, IDR)
)AS unpvt

您可以在管理工作室的新查询窗口中运行它，看它是否正常工作。

Answer 3

您也可以使用交叉连接来实现相同的

Select SpareParts
,CASE Value
WHEN 'JPY' THEN JPY
WHEN 'INR' THEN INR
WHEN 'SGD' THEN SGD
WHEN 'IDR' THEN IDR
END AS Currency
,Value
from Currency
Cross JOIN (VALUES ('JPY'),('INR'),('SGD'),('IDR')) AS CC(Value)

用单列重复表列

3 个答案: