Reading the right MySQL Manual

I learned an extremely valuable lesson today on a client site. It’s important that users of MySQL read the right version of the manual for the product they are using. It’s very easy to just goto http://dev.mysql.com/doc/ which is what I type in directly and browser the manual. While the MySQL Manual has separate sections for 4.x, 5.0, 5.1 etc, the 5.0 Manual for example reflects the most current version of MySQL 5.0. You may not be running the most current version, infact most production systems rarely run the current version.

My specific case was with Connector/J (JDBC) Reference of 5.0.4. The manual pages reflects the new 5.0.5 or todays’ 5.0.6 release and a particular default is now a different value. With Connector/J the docs are bundled with the version. The MySQL Community Server product does not bundle the manual, and I don’t know where to view instances of the MySQL manual for each specific dot release!

Tagged with: Databases MySQL

Producing IQR and Outlier statistics with SQL

Producing IQR and Outlier statistics with SQL

The interquartile range (IQR) measures the spread of the middle 50% of a distribution — the distance between the first quartile (Q1) and the third quartile (Q3). Combined with Tukey’s 1.

Producing Mode statistics with SQL

Producing Mode statistics with SQL

The mode is the value or values that appear most frequently in a dataset. Unlike the mean or median, it applies naturally to categorical and ordinal data — star ratings, product codes, survey responses — and reveals what is most common, not what is average.

Extending MySQL Capabilies with UDFs, Plugins and Components - Part 2

Extending MySQL Capabilies with UDFs, Plugins and Components - Part 2

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 In my prior post I provided a new uuidv function that accepted a numeric argument to return a string of the version of UUID specified.