Call now: 252-767-6166  
Oracle Training Oracle Support Development Oracle Apps

 E-mail Us
 Oracle Articles
New Oracle Articles

 Oracle Training
 Oracle Tips

 Oracle Forum
 Class Catalog

 Remote DBA
 Oracle Tuning
 Emergency 911
 RAC Support
 Apps Support
 Oracle Support

 SQL Tuning

 Oracle UNIX
 Oracle Linux
 Remote s
 Remote plans
 Application Server

 Oracle Forms
 Oracle Portal
 App Upgrades
 SQL Server
 Oracle Concepts
 Software Support

 Remote S


 Consulting Staff
 Consulting Prices
 Help Wanted!


 Oracle Posters
 Oracle Books

 Oracle Scripts

Don Burleson Blog 








Oracle Concepts - PL/SQL REPEAT-UNTIL Loop

Oracle Tips by Burleson Consulting


The WHILE loop test at the start of the loop and it the condition is false, the loop code is never executed.  If you want to ensure that the loop code is executed at least one, the test must be preformed at the bottom of the loop.  This is referred to as a REPEAT-UNTIL or DO-WHILE loop.  PL/SQL does not directly implement a REPEAT-UNTIL loop however it is easy to construct one using an endless loop.  By placing the EXIT WHEN (condition = true) statement as the last line of code in an endless loop you will achieve the same results.

SQL> declare
  2    n_num number := 1;
  3  begin
  4    loop
  5      dbms_output.put(n_num||', ');
  6      n_num := n_num + 1;
  7      exit when n_num > 5;
  8    end loop;
  9    dbms_output.put_line('Final: '||n_num);
 10  end;
 11  /
1, 2, 3, 4, 5, Final: 6
PL/SQL procedure successfully completed.

Since the condition test is at the bottom of the loop, you ensure that the loop code is executed at least once.

For the complete story, we recommend the book ?Easy Oracle PL/SQL Programming?.  Once you have mastered basic SQL you are ready for the advanced book ?Oracle PL/SQL Tuning? by Dr. Timothy Hall.

This is an excerpt from the bestselling "Easy Oracle Jumpstart" by Robert Freeman and Steve Karam (Oracle ACE and Oracle Certified Master).  It?s only $19.95 when you buy it directly from the publisher here.

If you like Oracle tuning, you may enjoy the new book "Oracle Tuning: The Definitive Reference", over 900 pages of BC's favorite tuning tips & scripts. 

You can buy it direct from the publisher for 30%-off and get instant access to the code depot of Oracle tuning scripts.



Oracle Training at Sea
oracle dba poster

Follow us on Twitter 
Oracle performance tuning software 
Oracle Linux poster


Burleson is the American Team

Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

Verify experience! Anyone considering using the services of an Oracle support expert should independently investigate their credentials and experience, and not rely on advertisements and self-proclaimed expertise. All legitimate Oracle experts publish their Oracle qualifications.

Errata?  Oracle technology is changing and we strive to update our BC Oracle support information.  If you find an error or have a suggestion for improving our content, we would appreciate your feedback.  Just  e-mail:  

and include the URL for the page.


Burleson Consulting

The Oracle of Database Support

Oracle Performance Tuning

Remote DBA Services


Copyright © 1996 -  2017

All rights reserved by Burleson

Oracle ® is the registered trademark of Oracle Corporation.

Remote Emergency Support provided by Conversational