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"ORA-00979: Not A GROUP BY Expression" After Upgrade to Database 12C (Doc ID 2005725.1)

Last updated on AUGUST 04, 2018

Applies to:

Oracle Application Express (APEX) - Version 4.2.6.00.03 to 5.0.1.00 [Release 4 to 5]
Information in this document applies to any platform.
@ Checked for relevance for APEX 4.2.6 on 01 June 2018

Symptoms

After upgrading the database to 12.1.0.2, logging into APEX and selecting "Administration" --> "Monitor Activity" ---> "Active Sesssion"
Returns error ORA-00979 : not a GROUP BY expression.

Cause

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