A very useful and common function
https://www.w3schools.com/sql/func_sqlserver_coalesce.asp
Return the first non-null value in a list:
COALESCE(NULL, NULL, NULL, 'W3Schools.com', NULL, 'Example.com')
returns 'W3Schools.com'
It exits in SQL, Qlik Sense, etc...
Best regards,
Simon