Oracle Open World Presentations

<p>
  At <a href="http://orancle.com/openworld">Oracle Open World 2011</a> there has been a large number of MySQL presentations. You can download the slides of my two presentations at <a href="http://effectivemysql.com/downloads/ExplainingTheMySQLEXPLAIN-OOW-2011.pdf">Explaining the MySQL Explain</a> and <a href="http://effectivemysql.com/downloads/ImprovingPerformanceWithBetterIndexes-OOW-2011.pdf">Improving Performance with Better Indexes</a>.
</p>

<p>
  You can find additional supporting information for these presentations in the <a href="http://effectivemysql.com/book/optimizing-sql-statements/">Effective MySQL: Optimizing SQL Statements</a> book.
</p>

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Tagged with: Databases MySQL MySQL Events

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.