As we all know how we Coalesce() function in SQL, it returns the first non-null value in a list.
For example : If we run the below query, will get the results as StatureStack.com
SELECT COALESCE(NULL, NULL, NULL, ‘StatureStack.com’, NULL, ‘mscrmtechie.blogspot.com’);
In simple words, it just returns whatever the first non-null value.
In the same way, we can use Coalecse function in Power Apps formulas as well. Today, I have two variables which has been set from different logics and I had to write the logic to get the not null value between two of them. I used below formula to get the not null value between two variables.
Coalesce(variable1, variable2, …)
Here is more information from Microsoft Docs
Hope this helps.