Question

I use the following statement to create a percentage calculation in a view:

round(((Surveys.RejectedAsAdvertising / Surveys.Responses) * 100),0) AS PercentageAdvertising

Basically, I divide the number of responses to a certain question (in this case, is something considered to be advertising) by the total number of responses.

In the end, I have columns that show percentages for each of five possible survey responses (“Is it advertising?”, “Is it boring?”, etc.).

This works perfectly but there’s one thing I’d like to tweak. When a response type (e.g., advertising) does not have any votes, my calculated field receives a NULL value.

When defining my view, how can I specify a default value of 0?

Thanks.

Answer 1

You need a coalesce in there. It selects the first non-NULL argument, so you need something like:

coalesce(
    round(
        ((Surveys.RejectedAsAdvertising / Surveys.Responses) * 100)
        ,0)
    ,0)
    AS PercentageAdvertising

Then, when the result of the round is NULL, it will give you zero instead.