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Editorial Team
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Asked: 2026-06-13T12:59:56+00:00

I have a problem trying to make an alias for new column and using

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I have a problem trying to make an alias for new column and using it in GROUP BY clause: 

SELECT TOP 100 Percent
count(id) AS [items_by_day],    
(SELECT DATEADD(dd, 0, DATEDIFF(dd, 0, [date]))) AS [date_part]
FROM [MyDB].[dbo].[MyTable]
GROUP BY DAY([date]), MONTH([date]), YEAR([date]), date_part

I get the following error:

Msg 207, Level 16, State 1, Line 5
Invalid column name 'date_part'.

How is it possible to solve the problem?

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1 Answer

  1. Editorial Team

    How about a subquery?

    See my demo at sqlfiddle

    Select  Count(*) as nrOfRecords, sq.[items_by_day], sq.[date_part] 
From (
    SELECT TOP 100 Percent count(id) AS [items_by_day]
      ,(Select Dateadd(dd, 0, Datediff(dd, 0, [date]))) AS [date_part]
    From  [MyTable] 
    Group By id, date
) as sq
Group by sq.[items_by_day], sq.[date_part]

    The part (SELECT DateAdd(... DateDiff(...)) seems to return the plain date. Can you explain what i am missing?

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