================================================================================
basic
================================================================================
insert into my_table values (1);
--------------------------------------------------------------------------------

(source_file
  (insert_statement
    (identifier)
    (insert_items
      (insert_values
        (insert_item (number))
      )
    )
  )
)

================================================================================
insert into table by specified columns
================================================================================
insert into my_table (name, email, display_name) values
  ('foo', 'bar@biz.baz', 'Foo bar');
--------------------------------------------------------------------------------

(source_file
  (insert_statement
    (identifier)
    (columns
      (identifier)
      (identifier)
      (identifier)
    )
    (insert_items
      (insert_values
        (insert_item (string))
        (insert_item (string))
        (insert_item (string))
      )
    )
  )
)

================================================================================
insert into table by specified columns with many values
================================================================================
insert into my_table (name, email, display_name) values
  ('foo', 'bar@biz.baz', 'Foo bar'),
  ('foo', 'bar@biz.baz', 'Foo bar'),
  ('foo', 'bar@biz.baz', 'Foo bar');
--------------------------------------------------------------------------------

(source_file
  (insert_statement
    (identifier)
    (columns
      (identifier)
      (identifier)
      (identifier)
    )
    (insert_items
      (insert_values
        (insert_item (string))
        (insert_item (string))
        (insert_item (string))
      )
      (insert_values
        (insert_item (string))
        (insert_item (string))
        (insert_item (string))
      )
      (insert_values
        (insert_item (string))
        (insert_item (string))
        (insert_item (string))
      )
    )
  )
)

================================================================================
insert into table with alias
================================================================================
insert into foo.my_table as alias values(1);
--------------------------------------------------------------------------------

(source_file
  (insert_statement
    (identifier)
    (as (identifier))
    (insert_items
      (insert_values
        (insert_item (number))
      )
    )
  )
)

================================================================================
insert into default values
================================================================================
insert into foo.my_table default values;
--------------------------------------------------------------------------------

(source_file
  (insert_statement
    (identifier)
    (insert_items)
  )
)

================================================================================
insert into with many value items
================================================================================
insert into foo.my_table values (1, 2);
--------------------------------------------------------------------------------

(source_file
  (insert_statement
    (identifier)
    (insert_items
      (insert_values
        (insert_item (number))
        (insert_item (number))
      )
    )
  )
)

================================================================================
insert into with different kind of value items
================================================================================
insert into foo.my_table values (1, DEFAULT, (select 1, 2));
--------------------------------------------------------------------------------

(source_file
  (insert_statement
    (identifier)
    (insert_items
      (insert_values
        (insert_item (number))
        (insert_item)
        (insert_item
          (select_statement
            (select_item (number))
            (select_item (number))
          )
        )
      )
    )
  )
)

================================================================================
insert into from select
================================================================================
insert into foo.my_table select column1 from foo bar;
--------------------------------------------------------------------------------

(source_file
  (insert_statement
    (identifier)
    (insert_items
      (select_statement
        (select_item (identifier))
        (select_from
          (from_item
            (from_table
              (identifier)
              (identifier)
            )
          )
        )
      )
    )
  )
)

================================================================================
insert into a table with the select enclosed in parentheses
================================================================================
insert into foo.my_table (select column1 from foo bar);
--------------------------------------------------------------------------------

(source_file
  (insert_statement
    (identifier)
    (insert_items
      (select_statement
        (select_item (identifier))
        (select_from
          (from_item
            (from_table
              (identifier)
              (identifier)
            )
          )
        )
      )
    )
  )
)

================================================================================
insert into with returning clause
================================================================================
insert into foo values (1) returning *, 1;
--------------------------------------------------------------------------------

(source_file
  (insert_statement
    (identifier)
    (insert_items
      (insert_values
        (insert_item (number))
      )
    )
    (returning
      (select_item (star))
      (select_item (number))
    )
  )
)

================================================================================
insert into using with clause
================================================================================
with foo as (select * from bar)
insert into my_table values (1);
--------------------------------------------------------------------------------

(source_file
  (insert_statement
    (with_query
      (with_query_item
        (identifier)
        (select_statement
          (select_item (star))
          (select_from
            (from_item
              (from_table
                (identifier)
              )
            )
          )
        )
      )
    )
    (identifier)
    (insert_items
      (insert_values
        (insert_item (number))
      )
    )
  )
)

================================================================================
insert into statement with returning into clause
================================================================================
insert into foo (bar, baz) select * from another
returning id into _var;
--------------------------------------------------------------------------------

(source_file
  (insert_statement
    (identifier)
    (columns
      (identifier)
      (identifier)
    )
    (insert_items
      (select_statement
        (select_item (star))
        (select_from
          (from_item
            (from_table
              (identifier)
            )
          )
        )
      )
    )
    (returning
      (select_item (identifier))
    )
    (into (identifier))
  )
)