I’m at some internal MySQL training today at our US HQ. In a room of 11 people we are all using our laptops for access to additional machines. The beauty of this is we have Linux (Ubuntu 5.10, 6.10, 7.04, Red Hat Fedora), Mac OS/X and Windows Operating Systems on various staff machines. It’s great to realize we are not locked into just one infrastructure, and we have the ability to all do our work effectively and MySQL works just as well across these technologies. I can’t however SSH from my iPhone yet, unlike my previous Nokia E62 PDA.
Producing Chi-Squared statistics with SQL
The Chi-Squared test is one of the most widely used statistical tests for categorical data. It comes in two flavors: the goodness-of-fit test asks whether an observed frequency distribution matches an expected one, while the test of independence asks whether two categorical variables are associated with each other.
Speaking at COSCUP 2026 — Planning your upgrade to MySQL 9.7
I am excited to be speaking at COSCUP 2026 in Taipei, Taiwan on August 8th and 9th. COSCUP (Conference for Open Source Coders, Users and Promoters) is one of the largest open source conferences in Asia, and it is always a privilege to present to the engaged and technically sharp community there.
Producing Two Sample T-Test statistics with SQL
The two sample t-test for equal variance is a statistical test to determine if the means of two groups are different enough that the difference is likely caused by some underlying difference, rather than random chance.