SQL metric rows to date columns- - sql

Question

Suppose I have the following table:
Client ContainerID Year Month NumberOfViews
bar 116025 2019 1 2
dandy 2753 2020 1 3
dandy 2753 2020 2 2
dandy 4247 2020 1 1
demo 20037 2019 1 1
I want it to transform to the following table:
Client ContainerID Jan-2019 Jan-2020 Feb-2020
bar 116025 2 0 0
dandy 2753 0 3 2
dandy 4247 0 1 0
demo 20037 1 0 0
meaning: year + month cell rows turns into columns and the value for 'NumberOfViews' goes to the right date column.

Answer 1

There you go.
Replace your table name:
WITH cte AS(
SELECT Client
,ContainerId
,NumberOfViews
,FORMAT(CAST(CAST([Year] AS CHAR(4)) + '-' + CAST([Month] AS CHAR(2)) + '-01' AS DATE), 'MMM-yyyy') AS [DateCol]
FROM dbo.Test)
SELECT Client
,ContainerId
,ISNULL([Jan-2019], 0) AS [Jan-2019]
,ISNULL([Jan-2020], 0) AS [Jan-2020]
,ISNULL([Feb-2020], 0) AS [Feb-2020]
FROM cte
PIVOT
(
SUM(NumberOfViews)
FOR DateCol IN ([Jan-2019], [Jan-2020], [Feb-2020])
) AS PivotTable;

Answer 2

I think you need a Dynamic PIVOT as the month-year is not static. Please try this below logic-
Please use your original table name where ever you found "your_table" in the script.
DECLARE #cols AS NVARCHAR(MAX),
#sqlCommand AS NVARCHAR(MAX);
SELECT #cols =
STUFF((SELECT ( '],[' + A.YM)
FROM
(
SELECT
CASE Month
WHEN 1 THEN 'Jan-' WHEN 2 THEN 'Feb-' WHEN 3 THEN 'Mar-'
WHEN 4 THEN 'Apr-' WHEN 5 THEN 'May-' WHEN 6 THEN 'Hun-'
WHEN 7 THEN 'Jul-' WHEN 8 THEN 'Aug-' WHEN 9 THEN 'Sep-'
WHEN 10 THEN 'Oct-' WHEN 11 THEN 'Nov-' WHEN 12 THEN 'Dec-'
END
+ CAST(Year AS VARCHAR) YM
FROM your_table
) A
ORDER BY A.YM
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')+']'
FROM your_table
SET #sqlCommand=
N'SELECT Client,ContainerID,'+SUBSTRING(#cols,2,LEN(#cols))+'
FROM
(
SELECT Client,ContainerID,YM,NumberOfViews
FROM
(
SELECT Client,ContainerID,NumberOfViews,
CASE Month
WHEN 1 THEN ''Jan-'' WHEN 2 THEN ''Feb-'' WHEN 3 THEN ''Mar-''
WHEN 4 THEN ''Apr-'' WHEN 5 THEN ''May-'' WHEN 6 THEN ''Hun-''
WHEN 7 THEN ''Jul-'' WHEN 8 THEN ''Aug-'' WHEN 9 THEN ''Sep-''
WHEN 10 THEN ''Oct-'' WHEN 11 THEN ''Nov-'' WHEN 12 THEN ''Dec-''
END
+ CAST(Year AS VARCHAR) YM
FROM your_table
)A
) AS P
PIVOT
(
SUM(NumberOfViews)
FOR YM IN('+SUBSTRING(#cols,2,LEN(#cols))+')
) PVT'
--PRINT #sqlCommand
EXEC (#sqlCommand)