Microsoft
Microsoft: Relationships Between Tables in a Data Model
Add more power to your data analysis by creating relationships among different tables. A relationship is a connection between two tables that contain data: one column in each table is the basis for the relationship. To see why...
Khan Academy
Khan Academy: Life Tables, Survivorship, & Age Sex Structure
This article describes tools ecologists use to describe the present state of a population and predict its future growth.
US Energy Information Administration
Energy Information Association: u.s. Household Electricity Report
The report provides an overview of the electricity consumption in households in 2001. End-use (lighting, appliances, heating) data is presented in written, graph and table form. Background on efficiency standards and regional factors...
Khan Academy
Khan Academy: Go Beyond the Hour
Continue learning the basics of using SQL to create tables, insert data, query data, and aggregate that data.