Subqueriese sql coverage fix

Add comment: "-- This pattern will only generate statements in schemas that define at least one float column."
By specifying "float" instead of numeric as the the type of #numone, you are limiting the schemas where ths pattern will be used. This MAY be a very clever way to prevent test case explosion, or it may just have been an accident. In any case, it is subtle enough that it should be pointed out in a comment.