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Using group by on multiple columns
...| ITB001 | 2 | Jenny |
| ITB001 | 2 | James |
| MKB114 | 1 | John |
| MKB114 | 1 | Erica |
+---------+----------+----------+
When you use a group by on the subject column only; say:
select Subject, Count(*)
from Subject_Selection
group by Subject
You wi...
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edited Jul 24 '19 at 13:43
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