Quick Search:
Oracle PL/SQL Code Library
Find Or Post Oracle Jobs
Oracle Discussion & Chat
 mySQL: Opposite of UNION Jump to:  
Category: >> mySQL >> Opposite of UNION Bookmark and Share

<< lastnext >>

Snippet Name: Opposite of UNION

Description: This finds all rows in table1 with an id value that is not present in table2 (that is, all rows in table1 with no corresponding row in table2). This assumes that table_2.id is declared NOT NULL.

Comment: (none)

Language: SQL
Highlight Mode: MYSQL
Last Modified: February 26th, 2009

SELECT table_1.* FROM table_1 
     LEFT JOIN table_2 ON table1.id=table_2.id
WHERE table_2.id IS NULL;

Oracle Magazine
and Oracle White Papers

SQL University.net courses meet the most demanding needs of the business world for advanced education in a cost-effective manner. SQL University.net courses are available immediately for IT professionals and can be taken without disruption of your workplace schedule or processes.

Compared to traditional travel-based training, SQL University.net saves time and valuable corporate resources, allowing companies to do more with less. That's our mission, and that's what we deliver.

Click here to find out more
Home      :      Code Library      :      Sponsors      :      Privacy      :      Terms of Use      :      Contact Us 43 users online    © 2009 psoug.org

Forgot your password?