A Window is part of a window function
specifying the window over which a window function operates.
Sequel::SQL::Window.new(partition: :col1)
# (PARTITION BY col1)
Sequel::SQL::Window.new(partition: [:col2, :col3])
# (PARTITION BY col2, col3)
Sequel::SQL::Window.new(order: :col4)
# (ORDER BY col4)
Sequel::SQL::Window.new(order: [:col5, Sequel.desc(:col6)])
# (ORDER BY col5, col6 DESC)
Sequel::SQL::Window.new(partition: :col7, frame: :all)
# (PARTITION BY col7 ROWS BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING)
Sequel::SQL::Window.new(partition: :col7, frame: :rows)
# (PARTITION BY col7 ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW)
Sequel::SQL::Window.new(partition: :col7, frame: "RANGE CURRENT ROW")
# (PARTITION BY col7 RANGE CURRENT ROW)
Sequel::SQL::Window.new(window: :named_window) # you can create a named window with Dataset#window
# (named_window)