FlattenOption converts Option[Option[T]] into Option[T].

MapOption returns Some[U] whose inner value is o's value mapped by f if o is Some.

MapOrElseOption returns value o's value applied by f if o is some.

MapOrOption returns o's value applied by f if o is some.

Option represents an optional value.

SqlNull[T] adapts Option[T] to sql.Scanner and driver.Valuer.