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Message Posted: Wed, 20 Jan 2010 @ 14:51:42 GMT


     
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Subj:   Re: Workaround to avoid product join
 
From:   Geoffrey Rommel

Teradata does product joins pretty well. Perhaps, instead of separate minute and second fields, the start and end times should be stored as seconds since midnight (0-86399). This will make the calculations easier.

If it is too late to change the physical tables, you could calculate those values in a derived table. Instead of "FROM Table A A", use something like this:

     FROM
      (select MINUTE_STARTING, MINUTE_ENDING, SEC_FIRST_MIN,
        SEC_LAST_MIN,
        (MINUTE_STARTING * 60) + SEC_FIRST_MIN as LOGON_SEC,
        (MINUTE_ENDING * 60) + SEC_LAST_MIN as LOGOFF_SEC, ...
        from TableA)   A

Hope this helps....



     
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