Query Table Formula Question

Query Table Formula Question

Hello, I am having an issue with my attempt to create a formula column in my query table. I'm combining two tables and would like the sum of the X&Y column to appear in Column Z. I'm finding that if either column X or Y is blank column Z will be empty as well. 

I understand it would need a step where empty cells in columns X and Y need to be converted to zero but I'm unsure how to do it.

My code:

SELECT
"2022 Retail Revenue - By Day - ST"."Year",
"2022 Retail Revenue - By Day - ST"."Period",
"2022 Retail Revenue - By Day - LS"."Total",
"2022 Retail Revenue - By Day - ST"."Total Revenue",
"2022 Retail Revenue - By Day - ST"."Completed Jobs",
"2022 Retail Revenue - By Day - ST"."2023 Goals",
"2022 Retail Revenue - By Day - ST"."Total Revenue" + "2022 Retail Revenue - By Day - LS"."Total" as "TOTAL$$"
FROM  "2022 Retail Revenue - By Day - LS"
RIGHT JOIN "2022 Retail Revenue - By Day - ST" ON "2022 Retail Revenue - By Day - ST"."Period"  = "2022 Retail Revenue - By Day - LS"."Period"


Outcome:

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