Short-Answer:   Do This Now:  

  Pick up all “SQL manuals” on your “desk” ... whether small or big(!)
  Personally whack your head against them

HTH™ ...

In reply to Re^2: DBD::Sqlite queries slow - and gives wrong results by eyepopslikeamosquito
in thread DBD::Sqlite queries slow - and gives wrong results by astroboy

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