php - Updating different fields based on whether or not other fields have values -

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the query below works fine. following:

  • update flag1 = '$uflag' if flag1 empty.
  • update flag2 = '$uflag' if flag1 had value in , flag2 empty.
  • update flag3 = '$uflag' if flag1 , flag2 have values in them , flag3 empty.

how this?

update submission set votes_up = $votes_up, flag1 = '$uflag'  submissionid = $id

if want keep query simple, determine sql utilize in php using conditions prior sql's execution.


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