用LEFT JOIN 代替NOT IN 或 NOT EXISTS：
SQL> conn scott/tiger
Connected.
SQL> CREATE TABLE testa
2 (
3 id number,
4 value varchar2(10)
5 );
Table created.
SQL> INSERT INTO testa VALUES(1,'a');
1 row created.
SQL> INSERT INTO testa VALUES(2,'b');
1 row created.
SQL> INSERT INTO testa VALUES(3,'c');
1 row created.
SQL> INSERT INTO testa VALUES(4,'d');
1 row created.
SQL> INSERT INTO testa VALUES(5,'e');
1 row created.
SQL> INSERT INTO testa VALUES(6,'f');
1 row created.
SQL> COMMIT;
Commit complete.
SQL> CREATE TABLE testb AS
2 SELECT * FROM testa WHERE 1=0;
Table created.
SQL> INSERT INTO testb VALUES(2,'b');
1 row created.
SQL> INSERT INTO testb VALUES(4,'d');
1 row created.
SQL> INSERT INTO testb VALUES(6,'f');
1 row created.
SQL> COMMIT;
Commit complete.
用左连接，结果testb表里TempColum的值为NULL：
SQL> SELECT a.*,b.id "TempColum" FROM testa a LEFT JOIN testb b ON a.id=b.id;
ID VALUE TempColum
---------- ---------- ----------
2 b 2
4 d 4
6 f 6
5 e NULL
3 c NULL
1 a NULL
6 rows selected.
将NULL值过滤出来就是最后需要的结果：
SQL>
SELECT c.id,c.value FROM
(
SELECT a.*,b.id "TempColum" FROM testa a LEFT JOIN testb b ON a.id=b.id
) c
WHERE c."TempColum" IS NULL
ORDER BY c.id
SQL>
ID VALUE
---------- ----------
1 a
3 c
5 e
)
