ANSI Join Syntax

I was reviewing some code for an Oracle colleague of mine the other day before it was released to the general public, and one of my comments was that I preferred to use the ANSI syntax for joins that came into the database with release 9i.

The original developer then asked what the point was, since the code was always doing a full join anyway.  One of the simple reasons that I like the ANSI syntax is because it is immediately obvious which parts of the WHERE clause are there to join tables together, and which parts are the “real” data selection criteria.

The place that I found best for explaining the syntax and what each means is the O’Reilly site here, which gives a great overview of what each type of join offers.

By continuing to use the site, you agree to the use of cookies. more information

In common with almost all professionally run websites, this website logs the IP address of each visitor in order to keep it running reliably. This is also essential for protecting the website and its visitors from malicious attacks, including infection with malware.

This website provides information as a service to visitors such as yourself, and to do this reliably and efficiently, it sometimes places small amounts of information on your computer or device (e.g. mobile phone). This includes small files known as cookies. The cookies stored by this website cannot be used to identify you personally.

We use cookies to understand what pages and information visitors find useful, and to detect problems such as broken links, or pages which are taking a long time to load.

We sometimes use cookies to remember a choice you make on one page, when you have moved to another page if that information can be used to make the website work better. For example:
- avoiding the need to ask for the same information several times during a session (e.g. when filling in forms), or
- remembering that you have logged in, so that you don’t have to re-enter your username and password on every page.

You can prevent the setting of cookies by adjusting the settings on your browser (see your browser Help for how to do this). Be aware that disabling cookies will affect the functionality of this and many other websites that you visit.

Close