SQL Server 2008 中针对动态列的算术运算符

Question

我有查询要在下面创建表和结果：

-- tblPart PartCode[NVARCHAR(50)],UnitPrice[Decimal(18,2)]
SELECT * INTO #tblPart FROM(
SELECT 'A' PartCode, '10' UnitPrice
UNION All
SELECT 'B','11'
UNION All
SELECT 'C','38'
UNION All
SELECT 'D','20'
UNION All
SELECT 'E','12')part;

-- tblPartCondition ConditionCode[NVARCHAR(50)],PercentagePrice[Decimal(18,2)]
SELECT * INTO #tblPriceCondition FROM(
SELECT 'Weekly' ConditionCode, '3' PercentagePrice
UNION All
SELECT 'Urgent','-5'
UNION All
SELECT 'Hotline','-10'
UNION All
SELECT 'Normal','0')pricecondition


SELECT PartCode,
       [Weekly]=p.UnitPrice + (SELECT (CAST(c.PercentagePrice AS DECIMAL(18,2))/100) FROM #tblPriceCondition c WHERE c.ConditionCode='Weekly'),
       [Urgent]=p.UnitPrice + (SELECT (CAST(c.PercentagePrice AS DECIMAL(18,2))/100) FROM #tblPriceCondition c WHERE c.ConditionCode='Urgent'),
       [Hotline]=p.UnitPrice + (SELECT (CAST(c.PercentagePrice AS DECIMAL(18,2))/100) FROM #tblPriceCondition c WHERE c.ConditionCode='Hotline'),
       [Normal]=p.UnitPrice + (SELECT (CAST(c.PercentagePrice AS DECIMAL(18,2))/100) FROM #tblPriceCondition c WHERE c.ConditionCode='Normal')
FROM #tblPart p

DROP TABLE #tblPart
DROP TABLE #tblPriceCondition

得到以下结果：

PartCode    Weekly   Urgent   Hotline    Normal
........    ......   ......   .......    ......
   A         10.03     9.95     9.9        10
   B         11.03    10.95    10.9        11
   C         38.03    37.95    37.9        38
   D         20.03    19.95    19.9        20
   E         12.03    11.95    11.9        12

上面的查询基于#tblPartCondition 中的已知列，请。知道列是否未知吗？ （例如，如果用户添加新的 PercentageCode、PercentagePrice）。 我会很感激你的宝贵时间和分享。谢谢！

Answer 1

获取数据透视列

DECLARE @cols NVARCHAR (MAX)

SELECT @cols = COALESCE (@cols + ',[' + ConditionCode + ']', '[' + ConditionCode + ']')
               FROM (SELECT DISTINCT ConditionCode FROM #tblPriceCondition) PV 
               ORDER BY ConditionCode

使用CROSS JOIN 为每个PartCode 获取ConditionCode 和PercentagePrice

DECLARE @query NVARCHAR(MAX)
SET @query = 'SELECT PartCode,' + @cols + ' FROM 
             (                 
                 SELECT PARTCODE,ConditionCode,
                 CAST(UnitPrice + CAST(PercentagePrice AS DECIMAL(18,2))/100 AS DECIMAL(18,2))  VALUE
                 FROM #tblPart
                 CROSS JOIN #tblPriceCondition
             ) x
             PIVOT 
             (
                 MIN(VALUE)
                 FOR ConditionCode IN (' + @cols + ')
            ) p
            ' 

EXEC SP_EXECUTESQL @query 

• Click here查看结果

请回复如何处理负值。
会更新。