I noticed that in SQLDeveloper, the insight feature has a pretty cool feature, in that, you can select, "auto generate GROUP BY Clause" (Screen -1). What this means, is that when you change your select columns, SQLDeveloper will automatically generate the columns in the GROUP BY clause for you (Screen -2). Navigation: Tools-->Preferences. Expand Code Editor. Click on "Completion Insight" and ensure that the Check box for "Autogenerate GROUP BY Clause" is selected.
Bug: However, Insight adds another column, if you add another GROUPING Function. If executed as it is, it will result in ORA-00904 error (Screen - 3)
