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Group by Months/Weeks

May 13, 2013 Leave a comment

Beautiful bit of code for counting valid fields and grouping the results in month/week chunks – simply replace the %%INTERVAL%% with either WEEK or MONTH (or any other valid DATEADD identifier, for that matter) and specify the table and %%DateField%% you are interested in:

    ;WITH d(d) AS 
    (
      SELECT DATEADD(%%INTERVAL%%, n, DATEADD(%%INTERVAL%%, 
DATEDIFF(%%INTERVAL%%, 0, @minDate), 0)) FROM ( SELECT TOP (DATEDIFF(%%INTERVAL%%, @minDate, @maxDate) + 1) n = ROW_NUMBER() OVER (ORDER BY [object_id]) - 1 FROM sys.all_objects ORDER BY [object_id] ) AS n ) SELECT --COALESCE(op.Id, @ID) AS ID, d.d AS Date, count(op.%%DateField%%) AS CountOfItems FROM d LEFT OUTER JOIN (select * FROM Ops o WHERE
o.Operation_Project = @Project_ID or @Project_ID = 1) op
ON op.%%DateField%% >= d.d AND
op.%%DateField%% < DATEADD(%%INTERVAL%%, 1, d.d) GROUP BY --op.Operation_Project, d.d HAVING d.d < (SELECT MAX(o.%%DateField%%) FROM Ops o
WHERE o.Id = @Project_ID or @Project_ID = 1) ORDER BY d.d

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Categories: SQL Server
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