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PL/SQL Feed

Oracle PL/SQL (Procedural Language/Structured Query Language) resources, news, and support articles.

SQL and date ranges: don’t make NULL mean something

We often use NULL values in date ranges, usually in the end date to signify the indefinite future. I have decided that this is a bad idea; here are my reasons. [Update 2014-07-04] There have been some great replies to this post. I am going to address some of their points. 1) NULL should not mean anything […]

Fedora VMWare Upgrade

New update of VMWare came out, and it is time to upgrade VMWare Tools. Here’s an update on the instructions for upgrading VMWare Tools:

July 1, 1858: Co-discovery of Evolution by Natural Selection

On this day in 1858, members of the Linnaean Society of London listened to the reading of a composite paper, with two authors, announcing the discovery of evolution by natural selection.
One author you've probably heard of: Charles Darwin
The other? Famous in his time, but in the 20th and 21st centuries largely forgotten: Alfred Russel Wallace.

APEX_ESCAPE, a new (and better) way of HTF.ESCAPE_SC

Last week, at the yearly ODTUG Kscope Conference, I did my presentation "Getting Started with APEX Plugin Development". After the session Patrick Wolf, Principal Member of Technical Staff for APEX, pointed out an improvement that could be made.
In the presentation I point out the need to escape the input that you get from a user of the plugin in order to protect the plugin from unwanted use, like SQL Injection, Cross Site Scripting and the like.

KScope14 - on my way home

For some reasons I got lounge access here at Seattle airport when going home fra KScope14. So I can use the last couple hours here lounging comfortably writing a few words about an awesome week here.

SQL to find World Cup matches with comebacks

Lucas Jellema is writing a great series on SQL applied to the World Cup of football / soccer. In the article about finding matches with comebacks, he challenged readers to “find ‘dramatic comebacks’ where a team was two goals behind at some stage and yet managed to win the game.” Here is my reply, since replying […]

ODTUG Kscope 2014: Wednesday

The morning started nice, ODTUG organized breakfast with country themes. There were tables for Australia, Canada and The Netherlands. If you are Dutch you might have expected to have hagelslag or cheese, this was not the case. It was a nice and hearty American style breakfast, eggs, bacon, potatoes.
The first session of the day that I went to was by Nathan Catlow on Oracle APEX Security, an interesting topic.

ODTUG Kscope 2014: Tuesday

Mark Drake, the product manager for XMLDB and the new JSON features in the database, started Tuesday with a session on flexible storage.
After a short history of the XMLDB ("more than just a LOB Store"), he went to the heart of the presentation: flexible storage.

ODTUG Kscope 2014: Monday

Monday morning started with the opening keynote. At the same time the Dutch soccer team played Chile (which the Dutch won with 2-0). A small Dutch delegation went to watch the game, all dressed in orange, I was one of them.
During the keynote the location of Kscope 2015 was announced: Hollywood, Florida.
Lunch was special, there were lunch and learn. There were "reserved" tables were you could sit on and talk tech with ACE Directors. We had some nice discussions at the table that I sat on, including the soccer game.

ODTUG KScope14 Sunday APEX Symposium

The ODTUG Kscope conference always starts with a full day symposium. There are several specialized tracks going on, and I attended the APEX track (mainly).
The room was packed, I would estimate around a 175 delegates.
Joel Kallman started the day with an overview of the history of APEX, including a video of Steve Balmer being very enthousiastic about APEX. He also told a bit about the background and how some features evolved throughout the years, like Themes and lessons learned with the packaged applications.

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