Planet MySQL contains the aggregation of MySQL articles from over 500 individuals and countries.
In the MySQL Community Blogging article, Ronald Bradford was recognized as the all-time top individual MySQL blogger at Planet MySQL. Ronald was also recognized as the top MySQL blogger in 2010 with 99 articles. If only I had known, I would have written one more.
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.
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.
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.
