Convert Rows to columns with variable number [duplicate] - sql

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Group by column and multiple Rows into One Row multiple columns
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I have read stuff on pivot tables and I am still having problems getting this correct.
I have a table where column 1 is a Productnr, and column 2 is LHS, column 3 is another Productnr and lastly column 4 is RHS. Also the number of entries of Productnr2 (belonging to Productnr) is variable between 1 and 5. For example, if there are only 3 associated Productnr2 (see article no = 060013 in Productnr) then the last two columns should remain empty.
Productnr LHS Productnr2 RHS
060009 411 099088 5
060013 228 194139 25
060013 228 194141 17
060013 228 175823 75
060022 951 147071 90
060034 424 099088 14
060034 424 102704 88
060034 424 080034 82
060034 424 108436 87
060034 424 108437 58
I would like it to come out as a pivot table, like this:
Productnr | LHS | 1 | RHS | 2 | RHS | 3 | RHS | 4 | RHS | 5 | RHS |
-----
060009 411 099088 5
060013 228 194139 25 194141 17 175823 75
060022 951 147071 90
060034 424 099088 14 102704 88 080034 82 108436 87 108437 58

Answer 1

This can achieve by the following query. But this will work only for five different columns only, if more columns needed then need to increase the case count, but this is not recommended. Better try some dynamic queries for more columns.
CREATE TABLE #temp(Productnr INT, LHS INT, Productnr2 INT, RHS INT)
INSERT INTO #temp VALUES (060009,411,099088,5 )
INSERT INTO #temp VALUES (060013,228,194139,25)
INSERT INTO #temp VALUES (060013,228,194141,17)
INSERT INTO #temp VALUES (060013,228,175823,75)
INSERT INTO #temp VALUES (060022,951,147071,90)
INSERT INTO #temp VALUES (060034,424,099088,14)
INSERT INTO #temp VALUES (060034,424,102704,88)
INSERT INTO #temp VALUES (060034,424,080034,82)
INSERT INTO #temp VALUES (060034,424,108436,87)
INSERT INTO #temp VALUES (060034,424,108437,58)
;WITH CTE AS(
SELECT *
,ROW_NUMBER() OVER(PARTITION BY Productnr ORDER BY Productnr)RN
FROM #temp
)
SELECT Productnr,LHS
,MAX(CASE WHEN RN=1 THEN Productnr2 END) [1]
,MAX(CASE WHEN RN=1 THEN RHS END) [RHS]
,MAX(CASE WHEN RN=2 THEN Productnr2 END) [2]
,MAX(CASE WHEN RN=2 THEN RHS END) [RHS]
,MAX(CASE WHEN RN=3 THEN Productnr2 END) [3]
,MAX(CASE WHEN RN=3 THEN RHS END) [RHS]
,MAX(CASE WHEN RN=4 THEN Productnr2 END) [4]
,MAX(CASE WHEN RN=4 THEN RHS END) [RHS]
,MAX(CASE WHEN RN=5 THEN Productnr2 END) [5]
,MAX(CASE WHEN RN=5 THEN RHS END) [RHS]
FROM CTE
GROUP BY Productnr,LHS
DROP TABLE #temp
Output:
Productnr LHS 1 RHS 2 RHS 3 RHS 4 RHS 5 RHS
----------- ----------- ----------- ----------- ----------- ----------- ----------- ----------- ----------- ----------- ----------- -----------
60009 411 99088 5 NULL NULL NULL NULL NULL NULL NULL NULL
60013 228 194139 25 194141 17 175823 75 NULL NULL NULL NULL
60022 951 147071 90 NULL NULL NULL NULL NULL NULL NULL NULL
60034 424 99088 14 102704 88 80034 82 108436 87 108437 58