SQL Server - Aggregation WITH ROLLUP options
In this tutorial, you will learn how to use the SQL ROLLUP to generate multiple grouping sets
The ROLLUP is an extension of the GROUP BY clause. The ROLLUP option allows you to include extra rows that represent the subtotals, which are commonly referred to as super-aggregate rows, along with the grand total row.
It is useful-
A. By using the ROLLUP option, you can use a single query to generate multiple grouping sets.
B. ROLLUP generates a result set that shows aggregates for a hierarchy of values in the selected columns.
C. By using ROLLUP, you can find total for corresponding to one or more columns
Examples
1. SQL ROLLUP with single column
2. SQL ROLLUP with multiple columns
3. SQL ROLLUP with partial rollup
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