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are you sure that works? (Score:1)

by bpphillips (5948) on 2009.12.07 13:56 (#71340)

Shouldn't it be (as it appears was suggested in your earlier post):

SUM( COALESCE( price, 0 ) ) AS total

If the coalesce is outside the sume, it doesn't fix the underlying issue of apply an aggregate function on a set of data that may contain a NULL value. Or, perhaps I'm missing something...

Reply to This
- Re: (Score:1)
  
  by derobert (9509)
  
  SUM ignores NULLs. So the sum of 1 and NULL is 1.
  SUM's behavior, of course, makes perfect sense: as 1+NULL yields NULL, so clearly the sum is 1.</sarcasm>

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