case class A (a:String,b:Int)
case class B (c:Double,d:Int)

//TODO  class C has the property of A and B
class C( val a:A,val b:B ) {
}

//Now I want to create a table for C
class Tb(tag: Tag) extends Table[ C ](tag, "a") {
  def col1 = column[String]("k1")
  def col1 = column[Int]("k2")
  def col1 = column[Double]("k3")
  def col1 = column[Int]("k4")
  def * = //TODO I don't know how to write * function either
}