sql> desc test;
名稱 是否為空? 型別
--------------------- -------- ---------------
id not null number(8)
username varchar2(32)
password varchar2(32)
age number(3)
birthday date
address
varchar2(40)
sql> select count(*) from test;
count(*)
----------
5000001
sql> select
*from
test
where
rownum
<10;
idusername
password
agebirthday
address--
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
325610
user325610
password325610
1015
-10月-15
the_earth
325611
user325611
password325611
1115
-10月-15
the_earth
325612
user325612
password325612
1215
-10月-15
the_earth
325613
user325613
password325613
1315
-10月-15
the_earth
325614
user325614
password325614
1415
-10月-15
the_earth
325615
user325615
password325615
1515
-10月-15
the_earth
325616
user325616
password325616
1615
-10月-15
the_earth
325617
user325617
password325617
1715
-10月-15
the_earth
325618
user325618
password325618
1815
-10月-15
the_earth
這種方式比較好理解，而且內層查詢效率高，整體查詢效率較穩定。
sql> select *
2from (select row_.*, rownum rownum_
3from (select *
4from test
5order
by id asc) row_
6where rownum <= 20)
7where rownum_ >= 10;
sql> select *
2from (select test.*, rownum rownum_ from test where rownum <= 5000000
order
by id asc)
3where rownum_ >= 4999990;
id
username
password
agebirthday
address--
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
---4999989
user4999989
password4999989
6915
-10月-15
the_earth
4999990
user4999990
password4999990
7015
-10月-15
the_earth
4999991
user4999991
password4999991
7115
-10月-15
the_earth
4999992
user4999992
password4999992
7215
-10月-15
the_earth
4999993
user4999993
password4999993
7315
-10月-15
the_earth
4999994
user4999994
password4999994
7415
-10月-15
the_earth
4999995
user4999995
password4999995
7515
-10月-15
the_earth
4999996
user4999996
password4999996
7615
-10月-15
the_earth
4999997
user4999997
password4999997
7715
-10月-15
the_earth
4999998
user4999998
password4999998
7815
-10月-15
the_earth
4999999
user4999999
password4999999
7915
-10月-15
the_earth
已選擇11行。
採用這種方式，查詢越靠後，效率越低，整體需要查詢兩次，而且逐條比較，不推薦使用。
sql> select *
2from test
3where id not
in4 (select id from test
5where rownum <= 20)
6and rownum <= 10
order
by id asc;
這種是採用minus函式取差集的方式獲取，同樣查詢越靠後，效率越低
sql> select *
2from test
3where rownum <= 20
4 minus
5select * from test where rownum <= 10;
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