not a single group function error.
1617
ORA-00979 not a group by expression
26170
Error in  : object of type 'closure' is not subsettable
55747
Grouping functions (tapply, by, aggregate) and the *apply family
158751
Oracle ORA-00979 - "not a GROUP BY expression"
49366
Group of order 30 can't be simple
49162
Classify all groups with order $pq$, $p$ is not equal to $q$
12066
Group of order pq is not simple
118022
Show that a group of order $180$ is not simple.
81892
Find four groups of order 20 not isomorphic to each other.
109060
Group containing no subgroup of index 2
119012
What types of fields are groupable in a SOQL `GROUP BY` clause?
126793
no room for new \count error
133138
Selecting more then one column when groupBy is present (db_select) - Drupal 8 added 'ONLY_FULL_GROUP_BY'
20944
How do I show that every group of order 90 is not simple?
57883
Example of a Subgroup That Is Not Normal
62085
Division by zero error when trying to divide data
64099
oracle sql not a group by expression while counting