InterSystems IRIS TSQL Code 164 GROUP BY expressions must refer to colum

In this post, you’ll learn about the SQL error code 164 in InterSystems IRIS database the reason why you are receiving the TSQL message when using the InterSystems IRIS data platform

Error Code :

164

Reason for the Error code 164 in InterSystems IRIS DBMS

GROUP BY expressions must refer to column names that appear in the select list.

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