Summarizing Data – Part 3

The SELECT reserved word is part of the Data Manipulation Language (DML) defined by Codd and is used to query data from the database. Because of its popularity, there are many clauses and functions that can be used to construct a query to retrieve data. I am continuing our exploration by reviewing SELECT queries that aggregate data. Data aggregation is the process of converting many records into a few records with special meaning. I will be using the Adventure Works 2012 sample database supplied by Microsoft during this talk. I…