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How to use ROLLUP with GROUP BY clause in SQL Server

As we know GROUP BY clause use to groups the result set into summary. For example pleas execute the following query.

I am creating a productSales table which have sales data of product for country.

CREATE TABLE #ProductSales
       ID INT IDENTITY(1,1),
       Country VARCHAR(500),
       Product VARCHAR(400),
       Sales DECIMAL(16,2),
       CreatedDate DATETIME

INSERT INTO #ProductSales
SELECT 'INDIA','A',200000,'01/01/2015'
SELECT 'INDIA','B',400000,'02/01/2015'
SELECT 'INDIA','C',100000,'02/01/2015'
SELECT 'USA','A',300000,'03/01/2014'
SELECT 'USA','B',500000,'04/01/2014'
SELECT 'CHINA','A',600000,'03/01/2014'
SELECT 'CHINA','B',800000,'04/01/2014'

Grouping result set using GROUP BY clause in bellow query.

SELECT Country, Product, SUM(Sales) AS Sales FROM #ProductSales
GROUP BY Country, Product

Result Set

Country           Product          Sales
CHINA             A                600000.00
INDIA             A                200000.00
USA               A                300000.00
CHINA             B                800000.00
INDIA             B                400000.00
USA               B                500000.00
INDIA             C                100000.00

(7 row(s) affected)

WITH ROLLUP: It is use to generate a subtotal row and grand total row for aggregate row. Please see following script.

SELECT Country, Product, SUM(Sales) AS [Total Sales] FROM #ProductSales

Result Set

Country        Product       Total Sales
CHINA          A             600000.00
CHINA          B             800000.00
CHINA          NULL          1400000.00-- Total Sales of China
INDIA          A             200000.00
INDIA          B             400000.00
INDIA          C             100000.00
INDIA          NULL          700000.00-- Total Sales of India
USA            A             300000.00
USA            B             500000.00
USA            NULL          800000.00-- Total Sales of USA
NULL           NULL          2900000.00-- Grand Total sales

(11 row(s) affected)

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