Doxygen Project

What the?

Well this is the inheritance diagram of the Item Class in the MySQL 5.1 Source tree, nicely documented using the Doxygen tool as mentioned by Jay in his presentation at MySQL Camp .

Jay started the Community Doxygen Project on the Forge to improve the level of commenting enabling a better platform for the community to contribute MySQL server code changes.

At this early stage David Shrewsbury is working on fine tuning initial documentation examples for QA and review. You can check out the Status Page of automated commenting conversion.

You can see the present documentation of MySQL 5.1 source here .

Tagged with: General MySQL MySQL Camp 1 - 2006

Producing Alternative Means statistics with SQL

Producing Alternative Means statistics with SQL

MySQL’s built-in AVG() computes the arithmetic mean — the sum divided by the count. That is the right default for many questions, but it is not always the right measure of central tendency.

Extending MySQL Capabilities with UDFs, Plugins and Components

Extending MySQL Capabilities with UDFs, Plugins and Components

MySQL offers three different approaches to extending the SQL capabilities with the default product you download and install. These are: User Defined Function (UDF) MySQL Manual MySQL Plugin MySQL Manual MySQL Component MySQL Manual For the purposes of this post I will be using the current LTS version MySQL 8.

Producing One-Sample Z-Test statistics with SQL

Producing One-Sample Z-Test statistics with SQL

The one-sample Z-test determines whether a sample mean differs significantly from a known population mean when the population standard deviation is also known. It is the appropriate test when the population parameters are established — quality control benchmarks, national averages, long-run process measurements — and you want to evaluate whether a new sample is consistent with them.