API Return a Value For Nulls

I have a Query All Records step in my API. Based on some joins in the API one of my returned columns either has a 1 or a null. I instead would like it to return a 1 or 0 before the final output.

What is the most efficient way to achieve this recoding from null to 0? Is it possible to address it in the original Query All Records step, or do I need to create a second function? If I need an additional function, what is the most light weight/fastest way to do this?

Working with APIs
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