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  • I suggest that none of the reasons from To normalize or not apply in your case. 1# you're looking at 2 JOIN's vs 0/1 JOIN and only 25k rows. Database engines are designed to handle high loads (Facebook runs on MySQL; and benchmark 40-100k inserts per second. 2# This just means that putting conditions in WHERE is same as in JOIN clauses (performance-wise). 3# You don't have large columns, MyISAM & InnoDB are both fine - just dont' mix them. Commented Jan 26, 2016 at 0:22
  • @Serge: If you would pharse your comment as an answer with a recommended approach, and explaining your reasoning like above, I would be happy to upvote it, possibly even accept it. Commented Jan 27, 2016 at 8:28