From RapidWiki

Contents 1 basics 1.1 SQL languages 1.2 Relational algebra 1.3 Web-based query languages 2 Uses in RapidMiner

basics

SQL languages

querying
updating tables
"dump" techniques, in analyzing PHP-based CMS systems (blogs, forums, KB, etc...)

Relational algebra

operators : left and right side "join", projection, reduction
normal forms
designing a relational database
designing an OLAP cube

Web-based query languages

• Regular expressions
• XPath

Uses in RapidMiner

• ExampleSetJoin
• ExampleSetMerge
• ExampleSetCartesian
• ExampleSetTranspose