Mysql: (date) functions and indexes

Mysql is usually pretty fast by default, but to keep performance to the max sometimes requires knowledge on how mysql works and how to write queries that does their job most efficiently. Today we ran across a simple example which illustrates that mysql’s ability to use an index depends on the way you write the query.
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SQL and beyond

SQL is a common language implemented by most databases. While it’s a nice language it does lack some features available in some databases (which often differ from database to database). Some argue, that you shouldn’t go beyond the contrains and limitations in SQL because that removes your ability to switch to a different database. That’s just wrong (in my opinion).
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