pg limit 되 돌아 오 는 줄 제한

limit 20:        20 
offset 20 limit 20：       40    20 

  ：
     ：
postgres=# create table test_limit(id int,name text);
CREATE TABLE
    ：
postgres=# insert into test_limit
select generate_series(1,100),'test';
INSERT 0 100
postgres=#

  limit  ：
postgres=# select * from test_limit order by id limit 20;
 id | name
----+------
  1 | test
  2 | test
  3 | test
  4 | test
  5 | test
  6 | test
  7 | test
  8 | test
  9 | test
 10 | test
 11 | test
 12 | test
 13 | test
 14 | test
 15 | test
 16 | test
 17 | test
 18 | test
 19 | test
 20 | test
(20 rows)

        20   。

postgres=# select * from test_limit order by id offset 20 limit 20;
 id | name
----+------
 21 | test
 22 | test
 23 | test
 24 | test
 25 | test
 26 | test
 27 | test
 28 | test
 29 | test
 30 | test
 31 | test
 32 | test
 33 | test
 34 | test
 35 | test
 36 | test
 37 | test
 38 | test
 39 | test
 40 | test
(20 rows)

    ，    40    20   。