Returns the first non-Null value from the arguments provided.
argument 1 (required) Arguments can be numbers, equations, column references or functions. If all values are Null, Null is returned.
argument 2+ (optional) Coalesce can evaluate several arguments.
NOTE: Arguments must all be of the the same type. All inputed arguments must be numbers, dates, or string, without mixing types. If you need to evaluate different types of arguments, you can use text(<argument>) to force the Coalesce function to read the input as a string.