mysql in和not in子查询实例讲解

首先有这样三张表：books表、authors表和authorbook

book表：

BookID	BookTitle	Copyright
12786	Java	1934
13331	MySQL	1919
14356	PHP	1966
15729	PERL	1932
16284	Oracle	1996
17695	Pl/SQL	1980
19264	JavaScript	1992
19354	www.java2s.com	1993

authors表

AuthID	AuthFN	AuthMN	AuthLN
1006	H	S.	T
1007	J	C	O
1008	B		E
1009	R	M	R
1010	J	K	T
1011	J	G.	N
1012	A		P
1013	A		W
1014	N		A

authorbook表

AuthID	BookID
1009	12786
1006	14356
1008	15729
1011	15729
1014	16284
1010	17695
1012	19264
1012	19354

现在我们开始in和not in子查询实例

1.获取book表中bookid为12786或14356或17695或19354的数据：

select *from book where bookid in(12786,14356,17695,19354)

结果为：

BookID	BookTitle	Copyright
12786	Java	1934
14356	PHP	1966
17695	Pl/SQL	1980
19354	www.java2s.com	1993

这是一个非常简单的mysql in实例，上面的SQL语句其实也可以用or代替：

select *from book where bookid=12786 or bookid=14356 or bookid=17695 or bookid=19354

2.获取book表中bookid字段的值在authorbook表中存在的书本信息：

select *from book where bookid in(select distinct BookID from authorbook)

结果为：

BookID	BookTitle	Copyright
12786	Java	1934
14356	PHP	1966
15729	PERL	1932
16284	Oracle	1996
17695	Pl/SQL	1980
19264	JavaScript	1992
19354	www.java2s.com	1993

因为bookid为13331的书本不在authorbook表中，所以该书本信息不在查询结果集中。

3.获取book表中bookid字段的值不在authorbook表中的书本信息：

select *from book where bookid not in(select distinct BookID from authorbook)

结果为：

BookID	BookTitle	Copyright
13331	MySQL	1919

4.再来一个复杂一点的：

SELECT BookTitle, Copyright
FROM Books
WHERE Copyright NOT IN
(
SELECT b.copyright
FROM Books AS b JOIN AuthorBook AS ab USING (BookID)
 JOIN Authors AS a USING (AuthID)
WHERE AuthLN='MySQL'
)
ORDER BY BookTitle 
/* http://www.manongjc.com/article/1404.html */

运行结果：

BookID	BookTitle	Copyright
12786	Java	1934
19264	JavaScript	1992
13331	MySQL	1919
16284	Oracle	1996
15729	PERL	1932
14356	PHP	1966
17695	Pl/SQL	1980
19354	www.java2s.com	1993

5. not in 其实相当于<> ALL， 因此在第三个实例中，SQL代码也可以这样写：

select *from book where bookid <> all(select distinct BookID from authorbook)