SQL SERVER 2005 
The GROUP BY statement is used in conjunction with the aggregate functions to group the result-set by one or more columns.
 
The GROUP BY statement is used in conjunction with the aggregate functions to group the result-set by one or more columns.
DECLARE@ProductDtls  TABLE(id INT, Department VARCHAR(30),Product VARCHAR(100))
--INSERT MULTIPLE RECORDS WITH ONE QUERY
INSERT INTO @ProductDtls (ID, Department, Product)
SELECT 1,'Electronics', 'Cameras & Video'UNION ALL
SELECT 2,'Electronics','Cameras & Video'UNION ALL
SELECT 3,'Electronics','Cell Phones & Accessories' UNION ALL
SELECT 4,'Electronics','Cell Phones & Accessories' UNION ALL
SELECT 5,'Electronics','Cell Phones & Accessories' UNION ALL
SELECT 6,'Electronics','Computers, Tablets & Laptops' UNION ALL
SELECT 7,'Electronics','Computers, Tablets & Laptops' UNION ALL
SELECT 8,'Fashion','Clothing & Accessories'UNION ALL
SELECT 9,'Fashion','Clothing & Accessories'UNION ALL
SELECT 10,'Fashion','Shoes' UNION ALL        
SELECT 11,'Fashion','Shoes' UNION ALL
SELECT 10,'Collectibles & Art','Antiques' UNION ALL
SELECT 11,'Collectibles & Art','Antiques' UNION ALL
SELECT 10,'Collectibles & Art','Antiques' UNION ALL
SELECT 11,'Collectibles & Art','Art' UNION ALL
SELECT 12,'Collectibles & Art','Art' 
--SELECT ALL RECORDS
SELECT * FROM @ProductDtls
--GET COUNT ON THE BASIS OF GROUP RECORDS
SELECT Department, COUNT(T.Product) 'ProductCount' FROM 
(SELECT DISTINCT Department,Product FROM @ProductDtls) T 
GROUP BY Department

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