Manage Parameter from Database

Anonymous I have played with your situation for a while unfortunately i think you hit a roadblock at the moment as the approach i took was to create a query that connects to your sql server table and convert it to parameter. Then use that parameter to replace url string in power query however problem is currently on few queries (that returns a single number, text, scalar values) can be converted to parameters and not all. Therefore in this case query that will return your value from sql server table even if you do it as select 1 will be returned as table and therefore not able to convert it to parameter.

I have read somewhere that feature of converting query to parameter is going to grow with newer releases and i would suggest you wait until you're able to convert. Until then vote for this idea.

Hope it make sense.