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In this presentation: http://docs.google.com/present/view?id=ddqht6x_1559tbtcgg
Slide 6.
The presenter’s snippets_tags table has a primary key, why? isn’t that just wasting space?
I usually use the other two cols. and not bother with a primary key.
Yes, the id column is unnecessary, and the PK should be against the other two columns.
But please, let’s all be clear. ID column != Primary Key.