SQL分组报表一例(摘自book online)

[code]USE pubs
GO
SELECT   Category = 
      CASE type
         WHEN 'popular_comp' THEN 'Popular Computing'
         WHEN 'mod_cook' THEN 'Modern Cooking'
         WHEN 'business' THEN 'Business'
         WHEN 'psychology' THEN 'Psychology'
         WHEN 'trad_cook' THEN 'Traditional Cooking'
         ELSE 'Not yet categorized'
      END,
   CAST(title AS varchar(25)) AS 'Shortened Title',
   price AS Price
FROM titles
WHERE price IS NOT NULL
ORDER BY type, price
COMPUTE ***G(price) BY type
GO

[code]Category            Shortened Title           Price                      
------------------- ------------------------- -------------------------- 
Business            You Can Combat Computer S 2.99                       
Business            Cooking with Computers: S 11.95                      
Business            The Busy Executive's Data 19.99                      
Business            Straight Talk About Compu 19.99                      

                                              avg
                                              ==========================
                                              13.73                      

Category            Shortened Title           Price                      
------------------- ------------------------- -------------------------- 
Modern Cooking      The Gourmet Microwave     2.99                       
Modern Cooking      Silicon Valley Gastronomi 19.99                      

                                              avg
                                              ==========================
                                              11.49                      

Category            Shortened Title           Price                      
------------------- ------------------------- -------------------------- 
Popular Computing   Secrets of Silicon Valley 20.00                      
Popular Computing   But Is It User Friendly?  22.95                      

                                              avg
                                              ==========================
                                              21.48                      

Category            Shortened Title           Price                      
------------------- ------------------------- -------------------------- 
Psychology          Life Without Fear         7.00                       
Psychology          Emotional Security: A New 7.99                       
Psychology          Is Anger the Enemy?       10.95                      
Psychology          Prolonged Data Deprivatio 19.99                      
Psychology          Computer Phobic AND Non-P 21.59                      

                                              avg
                                              ==========================
                                              13.50                      

Category            Shortened Title           Price                      
------------------- ------------------------- -------------------------- 
Traditional Cooking Fifty Years in Buckingham 11.95                      
Traditional Cooking Sushi, Anyone?            14.99                      
Traditional Cooking Onions, Leeks, and Garlic 20.95                      

                                              avg
                                              ==========================
                                              15.96                      

(21 row(s) affected)

[code]