Arithmetic operators against dynamic column in SQL

Question

I have query to create table and result below:

-- 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

and got result below:

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

The query above is based on known columns in #tblPartCondition, Pls. any idea if columns were unknown? (example if user add new PercentageCode, PercentagePrice). I would appreciate your value time and share. Thanks!

Answer 1

Get columns for pivot

DECLARE @cols NVARCHAR (MAX)

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

Use CROSS JOIN to get ConditionCode and PercentagePrice for each PartCode

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 to view result

Please reply to what to do on negative values.
Will update.