Define foreign key : Foreign Key « Key « SQL / MySQL

SQL / MySQL
1. Backup Load
2. Command MySQL
3. Cursor
4. Data Type
5. Database
6. Date Time
7. Flow Control
8. Function
9. Insert Delete Update
10. Join
11. Key
12. Math
13. Procedure Function
14. Select Clause
15. String
16. Table Index
17. Transaction
18. Trigger
19. User Permission
20. View
21. Where Clause
Java
Java Tutorial
Java Source Code / Java Documentation
Java Open Source
Jar File Download
Java Articles
Java Products
Java by API
Photoshop Tutorials
Maya Tutorials
Flash Tutorials
3ds-Max Tutorials
Illustrator Tutorials
GIMP Tutorials
C# / C Sharp
C# / CSharp Tutorial
C# / CSharp Open Source
ASP.Net
ASP.NET Tutorial
JavaScript DHTML
JavaScript Tutorial
JavaScript Reference
HTML / CSS
HTML CSS Reference
C / ANSI-C
C Tutorial
C++
C++ Tutorial
Ruby
PHP
Python
Python Tutorial
Python Open Source
SQL Server / T-SQL
SQL Server / T-SQL Tutorial
Oracle PL / SQL
Oracle PL/SQL Tutorial
PostgreSQL
MySQL Tutorial
VB.Net
VB.Net Tutorial
Flash / Flex / ActionScript
VBA / Excel / Access / Word
XML
XML Tutorial
Microsoft Office PowerPoint 2007 Tutorial
Microsoft Office Excel 2007 Tutorial
Microsoft Office Word 2007 Tutorial
SQL / MySQL » Key » Foreign Key 
Define foreign key

Drop table Books;
Drop table Authors;
Drop table AuthorBook;


CREATE TABLE Books (
   BookID SMALLINT NOT NULL PRIMARY KEY,
   BookTitle VARCHAR(60NOT NULL,
   Copyright YEAR NOT NULL
)
ENGINE=INNODB;

INSERT INTO Books VALUES (1'Letters', 1934),
                         (2'Ohio', 1919),
                         (3'Angels', 1966),
                         (4'Speaks', 1932),
                         (5'Man', 1996),
                         (6'A'1980),
                         (7'Card', 1992),
                         (8'The', 1993);

CREATE TABLE Authors (
   AuthID SMALLINT NOT NULL PRIMARY KEY,
   AuthFN VARCHAR(20),
   AuthMN VARCHAR(20),
   AuthLN VARCHAR(20)
)
ENGINE=INNODB;

INSERT INTO Authors VALUES (1'Henry', 'S.', 'Thompson'),
                           (2'Jack', 'Carol', 'Oates'),
                           (3'Red', NULL, 'Elk'),
                           (4'White', 'Maria', 'Rilke'),
                           (5'Anne', 'Kennedy', 'Toole'),
                           (6'Jane', 'G.', 'Neihardt'),
                           (7'Jane', NULL, 'Yin'),
                           (8'Alan', NULL, 'Wang');

CREATE TABLE AuthorBook (
   AuthID SMALLINT NOT NULL,
   BookID SMALLINT NOT NULL,
   PRIMARY KEY (AuthID, BookID),
   FOREIGN KEY (AuthIDREFERENCES Authors (AuthID),
   FOREIGN KEY (BookIDREFERENCES Books (BookID)
)
ENGINE=INNODB;

INSERT INTO AuthorBook VALUES (18)
                              (27)
                              (36)
                              (45),
                              (54)
                              (62)
                              (81);



           
       
Related examples in the same category
www.java2java.com | Contact Us
Copyright 2009 - 12 Demo Source and Support. All rights reserved.
All other trademarks are property of their respective owners.