Feature:
Things to Avoid in Queries
Subqueries and Correlated subqueries
http://dev.mysql.com/doc/refman/4.1/en/correlated-subqueries.html
Jan Kneschke?s post on Groupwise Maximum:
http://jan.kneschke.de/projects/mysql/groupwise-max
Calculated comparisons do not use indexes
INSERT IGNORE
REPLACE
INSERT?ON DUPLICATE KEY
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