第一种：

SELECT
 CASE
 WHEN price IS NULL THEN ‘Not yet priced’
 WHEN price < 10 THEN ‘Very Reasonable Title’
 WHEN price >= 10 and price < 20 THEN ‘Coffee Table Title’
 ELSE ‘Expensive book!’
 END AS “Price Category”,
CONVERT(varchar(20), title) AS “Shortened Title”
FROM pubs.dbo.titles
ORDER BY price

 第二种：

SELECT au_fname, au_lname,
   CASE state
      WHEN ‘CA’ THEN ‘California’
      WHEN ‘KS’ THEN ‘Kansas’
      WHEN ‘TN’ THEN ‘Tennessee’
      WHEN ‘OR’ THEN ‘Oregon’
      WHEN ‘MI’ THEN ‘Michigan’
      WHEN ‘IN’ THEN ‘Indiana’
      WHEN ‘MD’ THEN ‘Maryland’
      WHEN ‘UT’ THEN ‘Utah’
        END AS StateName
FROM pubs.dbo.authors
ORDER BY au_lname