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ORA-00937: not a single-group group function tips

Oracle Error Tips by Burleson Consulting

 

Oracle docs note this about ORA-00937:

 

ORA-00937 not a single-group group function

Cause: A SELECT list cannot include both a group function, such as AVG, COUNT, MAX, MIN, SUM, STDDEV, or VARIANCE, and an individual column expression, unless the individual column expression is included in a GROUP BY clause.

Action: Drop either the group function or the individual column expression from the SELECT list or add a GROUP BY clause that includes all individual column expressions listed.

Here is another example of a user encountering ORA-00903 from the OraFAQ forums:

Question:

I am trying to use a function that I created which will calculate my customer's bills, including discounts. 

However, every time I try to use the function, I receive ORA-00903.  Any suggestions?

Answer:

You are missing the GROUP BY clause in your function.  Try to take the SQL out and run it in SQL*Plus until it works again.  ORA-00937 can probably be detected during compile, but even if the function shows that it has been compiled, errors such as ORA-00937 may still be thrown.

Also, ORA-00937 may be occurring because of your SELECT clause.   Note that COUNT() and SUM() have to be grouped by all members in the SELECT clause.   


 

 

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