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datalib: get_logs_user*() - fix invalid SQL - MDL-12426
Oracle does not accept column labels in the GROUP BY section - get_logs_usercourse() and get_logs_userday() were computing the day/hours column and using it in the GROUP BY. The compatible fix is to reproduce the same computation in the GROUP BY section. Credit for the fix goes to Dennis Rochford <Dennis.Rochford@usq.edu.au>.
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