What?
In view of the fact that this error pops up in so many systems I take over, I have often gone down the wrong path following the red herring as it were when in fact the answer to this is very common. ...
...
I'll use this table to create the calendar.
Query #1: Works from command-line but may generate "Empty Query 1065"
SELECT
calendar.WeekNumber AS AcademicWeek,
DATE_FORMAT(calendar.StartDate, ...
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