Select one row for each different value of column, MySQL -

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I am a bit shaky and can not get my head around this MySQL

< / P>

I want to get the last print time for each event, Then select the Sales ID, which is for sale with that event ID more than the last print time.

I have taken the burden of the way but I can not understand it please help! 

  select s.saleID, s.eventID, s.saleTime, lp from LastPrintTime (EventID Select LP.eventID = s.eventID and saleTime> on LP InnerWare Joint Sales S from the print group by eventID as maximum (print time), LastPrintTime. Lp.LastPrintTime

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