Login | Register   
LinkedIn
Google+
Twitter
RSS Feed
Download our iPhone app
TODAY'S HEADLINES  |   ARTICLE ARCHIVE  |   FORUMS  |   TIP BANK
Browse DevX
Sign up for e-mail newsletters from DevX


advertisement
 

Tip: SQL Joins

A JOIN clause is used to combine rows from two or more tables.


advertisement
1. SELECT  FROM TableA A INNER JOIN TableB B ON A.key=B.key
2. SELECT  FROM TableA A RIGHT JOIN TableB B ON A.key=B.key 
3. SELECT  FROM TableA A RIGHT JOIN TableB B ON A.key=B.key WHERE A.key IS NULL
4. SELECT  FROM TableA A LEFT  JOIN TableB B ON A.key=B.key 
5. SELECT  FROM TableA A RIGHT JOIN TableB B ON A.key=B.key WHERE B.key IS NULL
6. SELECT  FROM TableA A FULL OUTER JOIN TableB B ON A.key=B.key
7. SELECT  FROM TableA A FULL OUTER JOIN TableB B ON A.key=B.key WHERE A.key IS NULL OR B.key IS NULL

 

Visit the DevX Tip Bank

 





   
Octavia Andreea Anghel is a senior PHP developer currently working as a primary trainer for programming teams that participate at national and international software-development contests. She consults on developing educational projects at a national level. She is a coauthor of the book "XML Technologies--XML in Java" (Albastra, ISBN 978-973-650-210-1), for which she wrote the XML portions. In addition to PHP and XML, she's interested in software architecture, web services, UML, and high-performance unit tests.
Comment and Contribute

 

 

 

 

 


(Maximum characters: 1200). You have 1200 characters left.

 

 

Sitemap
Thanks for your registration, follow us on our social networks to keep up-to-date