CSDN论坛上见到的一道sql问题

见：http://topic.csdn.net/u/20100625/21/cb7295e6-0514-4e28-888f-2935537208f4.html

有个表pages ,有5个属性，id, url, title, body, site.
问： 用一条SQL语句搜出url,body,或site中包含’test’字符串的数据，且将含有‘test’的url 的结果放在最前面,其次是body, 然后是site 且不能有重复数据

1. 如：

id url title body site
1 'a' 'b' 'c' 'd'
2 'a' 'b' 'c' 'test'
3 'a' 'b' 'test' 'd'
4 'ftest' 'b' 'c' 'd'
5 'test' 'b' 'test' 'test'
搜出的结果是：
id url title body site
4 'ftest' 'b' 'c' 'd'
5 'test' 'b' 'test' 'test'
3 'a' 'b' 'test' 'd'
2 'a' 'b' 'c' 'test'

============================================================

创建测试数据：

CREATE TABLE pages(id int,url nvarchar(100),Title nvarchar(100),body nvarchar(100),site nvarchar(100))
INSERT pages SELECT 1, 'a', 'b','c','d'
UNION ALL SELECT 2, 'a', 'b','c','test'
UNION ALL SELECT 3, 'a', 'b','test','d'
UNION ALL SELECT 4, 'ftest', 'b','c','d'
UNION ALL SELECT 5, 'ftest', 'b','test','test'
UNION ALL SELECT 6, 'fffffffffff', 'testb','testc','d'
GO

执行查询：

(1)

select * from pages

id          url          Title          body            site
----------------------------------------------------------------------
1           a               b           c               d
2           a               b           c               test
3           a               b           test            d
4           ftest           b           c               d
5           ftest           b           test            test
6           fffffffffff     testb       testc           d

(6 行受影响)

(2)

select * from pages where url like '%test%' or body like '%test%' or site like '%test%'
order by case
when url like '%test%' then 0
when body like '%test%' then 1
when site like '%test%' then 2 end

id          url         Title           body            site
-----------------------------------------------------------------------
4           ftest           b           c               d
5           ftest           b           test            test
6           fffffffffff     testb       testc           d
3           a               b           test            d
2           a               b           c               test

(5 行受影响)