Agreed, but you can still find fairly simple questions related to the domain they should know to weed out a lot of people. For applications that will use a lot

Agreed, but you can still find fairly simple questions related to the domain they should know to weed out a lot of people. For applications that will use a lot of SQL back end, I will ask the person to describe what a Left Outer Join does (what will it produce). That question lets me know if you have done any SQL beyond a basic query or basic inner join.