SQL联合在where子句中使用coalesce（？）

I am trying to incorporate old help desk records into a newer help desk app. I still have all the data from the old help desk app and it uses the same fields as the new one but its in a different file. This select statement works fine for the newer application to search all the past calls for something specific, whether its a keyword or who it is allocated to and so on.I am trying to incorporate old help desk record