================================================================================
whole table
================================================================================
delete from tasks;
--------------------------------------------------------------------------------

(source_file
  (delete_statement
    (identifier)))

================================================================================
where
================================================================================
delete from tasks where status <> 'Musical';
--------------------------------------------------------------------------------

(source_file
  (delete_statement
    (identifier)
    (where_filter
      (op_expression
        (identifier)
        (comparison_op)
        (string)))))

================================================================================
returning
================================================================================
DELETE FROM tasks WHERE status = 'DONE' RETURNING *;
--------------------------------------------------------------------------------

(source_file
  (delete_statement
    (identifier)
    (where_filter
      (op_expression
        (identifier)
        (comparison_op)
        (string)))
    (select_item
      (star))))

================================================================================
delete using subselect
================================================================================
DELETE FROM foo a USING (select baz from bar) b WHERE a.b = b.b;
--------------------------------------------------------------------------------

(source_file
  (delete_statement
    (identifier)
    (identifier)
    (delete_using
      (from_item
        (from_select
          (select_statement
            (select_item
              (identifier))
            (select_from
              (from_item
                (from_table
                  (identifier)))))
          (identifier))))
    (where_filter
      (op_expression
        (identifier)
        (comparison_op)
        (identifier)))))

================================================================================
with cte
================================================================================
with foo as (select * from bar)
delete from baz;
--------------------------------------------------------------------------------

(source_file
  (delete_statement
    (with_query
      (with_query_item
        (identifier)
        (select_statement
          (select_item
            (star))
          (select_from
            (from_item
              (from_table
                (identifier)))))))
    (identifier)))

================================================================================
returning into
================================================================================
delete from foo
returning id into _backup_id;
--------------------------------------------------------------------------------

(source_file
  (delete_statement
    (identifier)
    (select_item
      (identifier))
    (into
      (identifier))))