
What is SQL and How Do We Use It?
With every transaction a business makes, a new piece of data is formed. We can tap into this data by querying, or asking, the computer’s database for the data that we are interested in analyzing, using SQL (Structured Query Language).

The Many Flavors of SQL
Imagine looking at the customer purchase history of a company and all of the data one can put into a database. Instead of looking at all the data as a whole, we would logically split the data into parts, such as the store data, the customer identification data, the product data and the purchased data.

SQL Commands Cheat Sheet
This handy cheat sheet will serve as a reference for your basic SQL querying needs and provide some examples to apply the material.