Simple way to prevent a Divide By Zero error in SQL

Question

I have a SQL query which used to cause a

Divide By Zero exception

I\'ve wrapped it in a CASE statement to stop this fr

Answer 1

In my opinion the CASE statement is exactly the way to go. Rather than calculating something you state the value to return for the case that AttTotal is zero. You could even add another case branch for 0 of 0 being 100%.

Just a side note: I would not return 0 when AttTotal is zero and ClubTotal is greater than zero. NULL might be more appropriate. Or you would create strings (e.g. '10.50%') rather than numbers (e.g. 10.5%), containing "No att. total" in case AttTotal is zero:

PercentageString :=
  CASE
    WHEN AttTotal = 0 AND ClubTotal = 0 then '100%'
    WHEN AttTotal = 0 AND ClubTotal <> 0 THEN 'No att. total'
    ELSE to_char(ClubTotal / AttTotal * 100) || '%'
  END;