Mysql实例mysql子查询中EXISTS用法的例子

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本文介绍了Mysql实例mysql子查询中EXISTS用法的例子，希望对您有用。如果有疑问，可以联系我们。

本节内容：
mysql子查询中EXISTS的用法MYSQL入门

sql语句：??????
?MYSQL入门

mysql> CREATE TABLE titles (
??? ->?? titleID int(11),
??? ->?? title varchar(100),
??? ->?? subtitle varchar(100),
??? ->?? edition tinyint(4),
??? ->?? publID int(11),
??? ->?? catID int(11),
??? ->?? langID int(11),
??? ->?? year int(11),
??? ->?? isbn varchar(20),
??? ->?? comment varchar(255),
??? ->?? ts timestamp,
??? ->?? authors varchar(255),
??? ->?? PRIMARY KEY? (titleID)
??? -> );
Query OK,0 rows affected (0.01 sec)MYSQL入门

mysql> INSERT INTO titles VALUES (1,'Linux','Installation',5,1,57,2,2000,NULL,'2005-02-28 13:34:21','Michael'),
??? ->?????????????????????????? (2,'Excel',3,'2005-02-28 13:34:22','David'),
??? ->?????????????????????????? (3,'XML',1997,'Edwards'),
??? ->?????????????????????????? (4,'PHP',6,'Tom'),
??? ->?????????????????????????? (5,'MySQL','',34,'Paul'),
??? ->?????????????????????????? (6,'Java',4,1999,'Tim');
Query OK,6 rows affected (0.00 sec)
Records: 6? Duplicates: 0? Warnings: 0MYSQL入门

mysql> CREATE TABLE publishers (
??? ->?? publID int(11) NOT NULL auto_increment,
??? ->?? publName varchar(60) collate latin1_german1_ci NOT NULL default '',
??? ->?? ts timestamp NOT NULL default CURRENT_TIMESTAMP on update CURRENT_TIMESTAMP,
??? ->?? PRIMARY KEY? (publID),
??? ->?? KEY publName (publName)
??? -> ) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_german1_ci;
Query OK,0 rows affected (0.00 sec)MYSQL入门

mysql> INSERT INTO publishers VALUES (1,'A','2004-12-02 18:36:58'),
??? ->???????????????????????????????? (2,'Apress',
??? ->???????????????????????????????? (3,'New Riders',
??? ->???????????????????????????????? (4,'O'Reilly & Associates',
??? ->???????????????????????????????? (5,'Hanser','2004-12-02 18:36:58');
Query OK,5 rows affected (0.00 sec)
Records: 5? Duplicates: 0? Warnings: 0MYSQL入门

mysql> SELECT title FROM titles WHERE EXISTS --//exists的用法
??? -> (SELECT * FROM publishers WHERE
??? -> titles.publID = publishers.publID AND
??? -> publName LIKE 'O%');
+-------+
| title |
+-------+
| Java? |
+-------+
1 row in set (0.00 sec)MYSQL入门

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