Cannot use an aggregate or a subquery in an expression used for the group by list of a GROUP BY clause.

Error Message:
Msg 144, Level 15, State 1, Line 4
Cannot use an aggregate or a subquery in an expression used for the group by list of a GROUP BY clause.

Severity level:
15.

Description:
This error message appears when you try to use an aggregate or a subquery in the group by list of the GROUP BY clause

Consequences:
The T-SQL statement can be parsed, but causes the error at runtime.

Resolution:
Error of the Severity level 15 are generated by the user and can be fixed by the SQL Server user. The statement cannot be run this way. You cannot run such a query.

Versions:
All versions of SQL Server.

Example(s):
SELECT
    MIN(1)
GROUP BY
    (SELECT MIN(1))

Remarks:
In the above example we try to use the MIN() aggregate in the subquery of the group by list. This raises the error.



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