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Greg Wilson [Sun, 10 Nov 2013 10:30:52 +0000 (05:30 -0500)]
More database lessons for novices. To do:
* `group by` in aggregation
* data hygiene
* explain the `%%sqlite` magic
Greg Wilson [Sat, 9 Nov 2013 16:43:13 +0000 (11:43 -0500)]
First three lessons on SQL for beginners