Question

I have the following query on a populated Table variable that is supposed to return rows or each with the most recent date:

SELECT t.ID
    ,t.Column_2
    ,t.MaxDate AS [End Date Time]
    ,t.Column_3
    ,t.Column_4
    ,t.Column_5
FROM (
    SELECT ID
        ,Column_2
        ,MAX(EndDateTime) AS MaxDate
        ,Column_3
        ,Column_4
        ,Column_5
    FROM @MyTable
    GROUP BY Column_2
    ) t
INNER JOIN @MyTable o ON t.ID = o.ID
    AND t.MaxDate = o.EndDateTime

I keep getting the error: Column '@MyTable.ID' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause. Not sure what the problem is as I’m including a GROUP BY clause in the inner select statement, do I need one outter select query as well? Also, how can a modify this to ORDER BY EndDateTime DESC in the final return result?? Thank you in advance.

UPDATE:

Thank you all for your feedback, I corrected the error and learned something new. THanks.

Answer 1

You need to include all the columns that you are not aggregating. I think you should do the following:

SELECT o.ID
    ,o.Column_2
    ,t.MaxDate AS [End Date Time]
    ,o.Column_3
    ,o.Column_4
    ,o.Column_5
FROM (
    SELECT ID
        ,MAX(EndDateTime) AS MaxDate
    FROM @MyTable
    GROUP BY ID
    ) t
INNER JOIN @MyTable o ON t.ID = o.ID
    AND t.MaxDate = o.EndDateTime