Using The GROUPING SETS Operator

Kevin Feasel

2017-11-16

T-SQL

Alfonso Hernandez goes into detail with what you can do with GROUPING SETS:

In T-SQL, you summarize data by using the GROUP BY clause within an aggregate query. This clause creates groupings which are defined by a set of expressions. One row per unique combination of the expressions in the GROUP BY clause is returned, and aggregate functions such as COUNT or SUMmay be used on any columns in the query. However, if you want to group the data by multiple combinations of group by expressions, you may take one of two approaches. The first approach is to create one grouped query per combination of expressions and merge the results using the UNION ALLoperator. The other approach is to use the GROUPING SETS operator along with the GROUP BY clause and define each grouping set within a single query.

In this article I’ll demonstrate how to achieve the same results using each method.

Mastering GROUPING SETS makes reporting queries in T-SQL so much more effective.

Related Posts

Computing Time to Payment on Invoices

Daniel Hutmacher has a painful but realistic problem to solve: Here’s an example customer. You’ll notice right off the bat that we’re sending this customer an invoice every day on the 20th of the month. To add some complexity, the customer will arbitrarily pay parts of the invoiced amount over time, and to add insult […]

Read More

Tracking Who Changed Data

Bert Wagner is on a quest to find out who moved his cheese: Have you ever wondered who was the last person (or process) to modify a piece of data in your database? SQL Server offers plenty of system views and functions that provide insight into how your server is running and how your queries are performing. […]

Read More

Categories

November 2017
MTWTFSS
« Oct Dec »
 12345
6789101112
13141516171819
20212223242526
27282930