sql query, each column in result is a different WHERE clause [duplicate] - sql

Question

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SQL Server dynamic PIVOT query?
(9 answers)
Closed 6 years ago.
I'm trying to find the easiest way to return some results based on dates.
So for example the table is like this
product date qty
corn 4/18/16 5
corn 4/18/16 1
corn 4/15/16 10
I would want the results to be
product 4/15/16 4/18/16
corn 10 6
So I am grouping by the product, sum the qty, but each column in result will be a different WHERE filedate = .
Can someone please point me in the right direction?

Answer 1

Try like this
SELECT * FROM
(
SELECT product,date,qty
FROM Table1
)X
PIVOT
(
SUM(X.qty)
FOR date IN([4/18/16],[4/15/16])
)Y
For multiple source, you need to write dynamic query like below
DECLARE #cols AS NVARCHAR(MAX),#query AS NVARCHAR(MAX)
;WITH CTE (DATELIST, MAXDATE) AS
(
SELECT '01/04/2016' DATELIST, '30/04/2016' MAXDATE
UNION ALL
SELECT DATEADD(dd, 1, DATELIST), MAXDATE
FROM CTE
WHERE DATELIST < MAXDATE
)
SELECT C.DATELIST
INTO #TempDates
FROM CTE C
SELECT #cols = STUFF((SELECT DISTINCT ',' + QUOTENAME(convert(CHAR(10), DATELIST, 120))
FROM #TempDates
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')
SET #query = 'SELECT product,' + #cols + ' FROM
(
SELECT B.product, B.date, B.qty, D.DATELIST, CONVERT(CHAR(10), DATELIST, 120) PivotDate
FROM #TempDates D
LEFT JOIN YourTable B ON D.DATELIST BETWEEN ''01/04/2016'' AND ''30/04/2016''
) X
PIVOT
(
SUM(qty)
FOR PivotDate IN (' + #cols + ')
) P '
EXECUTE(#query)