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Re:Show HN: SQL Police Department – Learn SQL while solving ... by rpunkfu on Monday May 04, 2020 @11:10PM (#23076047)
Syntax is fine, it's complaining because you didn't include `JoinDate` column in your query.
Re:Show HN: SQL Police Department – Learn SQL while solving ... by mulmen on Tuesday May 05, 2020 @12:01AM (#23076353)
This appears to be a syntax error. I get a different error if I add JoinDate to the SELECT clause without adding the other columns it wants.