Subquery with EXISTS : Exists « Select Clause « SQL / MySQL

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SQL / MySQL » Select Clause » Exists 
Subquery with EXISTS
       
mysql>
mysql>
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, rows affected (0.01 sec)

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

mysql>
mysql> CREATE TABLE publishers (
    ->   publID int(11NOT NULL auto_increment,
    ->   publName varchar(60collate 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, rows affected (0.00 sec)

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

mysql>
mysql>
mysql>
mysql> SELECT title FROM titles WHERE EXISTS
    -> (SELECT FROM publishers WHERE
    -> titles.publID = publishers.publID AND
    -> publName LIKE 'O%');
+-------+
| title |
+-------+
| Java  |
+-------+
row in set (0.00 sec)

mysql>
mysql>
mysql> drop table titles;
Query OK, rows affected (0.00 sec)

mysql> drop table publishers;
Query OK, rows affected (0.00 sec)

mysql>

   
    
    
    
    
    
    
  
Related examples in the same category
1.Subquery: Using EXIST Operator
2.Use the NOT EXISTS operator in the same way as the EXISTS operator, only the opposite results are returned.
3.Sub query with EXISTS command
4.Sub query with NOT EXISTS command
5.Exists and subquery
6.Not exists and subquery of constant value
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