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Writing efficient PHP
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 Tutorial: Writing efficient PHP 
Optimizing database queries
 1. The importance of efficient SQL
 2. Streamlining SELECT statements
 3. Eliminating any unnecessary ORDER BY clauses
 4. Watching for complex SELECTs
 5. Eliminating or reducing duplicate requests for the same data
 6. Considering indexes
 7. Handling results sets
 8. Section summary
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