SQL$HELP72.HLB  —  Errors  SQL_ERRORS, BADARGAVG
  Argument of AVG, STDDEV and VARIANCE must be numeric or interval

  Explanation:  The expression for an AVG, STDDEV and VARIANCE
  function must be numeric or interval.

  User Action:  Change the value expression to contain only
  numeric or interval fields, or remove the function.
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