求sql代码程序

[zaytsing]

create table info1
(
na nvarchar(10) not null,
p1 int,
p2 int,
p3 int
)
insert into info1
select 'aaa',67, 85,90 union all
select 'bbb',97,78,59

na p1 p2 p3
aaa 67 85 90
bbb 97 78 59

就是成绩在60以下为不及格，60-75及格，75-89为良好，90-100为优秀
要求出现
na p1 p2 p3
aaa 及格 良好 优秀
bbb 优秀 良好 不及格

[rucypli]

case when

[feixianxxx]

create table info1 
( 
na nvarchar(10) not null, 
p1 int, 
p2 int, 
p3 int 
) 
insert into info1 
select 'aaa',67, 85,90 union all 
select 'bbb',97,78,59 
go
select 
na,
p1 =case when p1 between 60 and 75 then '及格' when p1 between 76 and 89 then '良好'
            when p1 between 90 and 100 then  '优秀'  else '不及格' end,
p2 =case when p2 between 60 and 75 then '及格' when p2 between 76 and 89 then '良好'
            when p2 between 90 and 100 then  '优秀'  else '不及格' end,
p3 =case when p3 between 60 and 75 then '及格' when p3 between 76 and 89 then '良好'
            when p3 between 90 and 100 then  '优秀'  else '不及格' end
from info1
            


na         p1     p2     p3
---------- ------ ------ ------
aaa        及格     良好     优秀
bbb        优秀     良好     不及格

[--小F--]

select na,
p1=case  when p1<'60' then '不及格', 
         when '60'<=p1<'75' then '及格',
         when '75'<p1<='89' then '良好',
         else '优秀' end,
p2=case  when p1<'60' then '不及格', 
         when '60'<=p1<'75' then '及格',
         when '75'<p1<='89' then '良好',
         else '优秀' end,
p3=case  when p1<'60' then '不及格', 
         when '60'<=p1<'75' then '及格',
         when '75'<p1<='89' then '良好',
         else '优秀' end
from info1

[guguda2008]

23L正解，懒得和你们抢了

[昵称被占用了]

select n
  ,case when P1>=90 then '优秀' when P1>=75 then '良好' when P1>=60 then '及格' else '不及格' end as P1
  ,case when P2>=90 then '优秀' when P2>=75 then '良好' when P2>=60 then '及格' else '不及格' end as P2
  ,case when P3>=90 then '优秀' when P3>=75 then '良好' when P3>=60 then '及格' else '不及格' end as P3
from info1 

[soft_wsx]

create table info1 
( 
na nvarchar(10) not null, 
p1 int, 
p2 int, 
p3 int 
) 
insert into info1 
select 'aaa',67, 85,90 union all 
select 'bbb',97,78,59 

na  p1  p2  p3 
aaa  67  85  90 
bbb  97  78  59 


select a.na,p1=case 
                 when  p1 between  60 and 75 then '及格'
                 when  p1 between   75 and 89 then '及格'
                 when  p1 between   90 and 100 then '优秀'
                 else '不及格'
                end,
             p2=case 
                 when p2 between  60 and 75 then '及格'
                 when p2 between    75 and 89 then '及格'
                 when p2 between    90 and 100 then '优秀'
                 else '不及格'
                end,
             p3=case 
                 when p3 between      60 and 75 then '及格'
                 when p3 between      75 and 89 then '及格'
                 when p3 between      90 and 100 then '优秀'
                 else '不及格'
                end         
  from info1 A
/*
na	p1	p2	p3
aaa	及格	及格	优秀
bbb	优秀	及格	不及格
*/

[soft_wsx]

抢不过你们

[soft_wsx]

这对楼主有帮助
SQL CASE WHEN用法 
SQL CASE WHEN用法 
CASE 可能是 SQL 中被误用最多的关键字之一。虽然你可能以前用过这个关键字来创建字段，但是它还具有更多用法。例如，你可以在 WHERE 子句中使用 CASE 。 
 
首先让我们看一下 CASE 的语法。在一般的 SELECT 中，其语法如下： 
 
 SELECT <</SPAN>myColumnSpec > = 
 CASE 
 WHEN <</SPAN>A > THEN <</SPAN>somethingA > 
 WHEN <</SPAN>B > THEN <</SPAN>somethingB > 
 ELSE <</SPAN>somethingE > 
 END 
 
在上面的代码中需要用具体的参数代替尖括号中的内容。下面是一个简单的例子： 
 
 USE pubs 
 GO 
 SELECT 
 Title, 
 ' Price Range ' = 
 CASE 
 WHEN price IS NULL THEN ' Unpriced ' 
 WHEN price <</SPAN> 10 THEN ' Bargain ' 
 WHEN price BETWEEN 10 and 20 THEN ' Average ' 
 ELSE ' Gift to impress relatives ' 
 END 
 FROM titles 
 ORDER BY price 
 GO 
 
这是 CASE 的典型用法，但是使用 CASE 其实可以做更多的事情。比方说下面的 GROUP BY 子句中的 CASE ： 
 
 SELECT ' Number of Titles ' , Count ( * ) 
 FROM titles 
 GROUP BY 
 CASE 
 WHEN price IS NULL THEN ' Unpriced ' 
 WHEN price <</SPAN> 10 THEN ' Bargain ' 
 WHEN price BETWEEN 10 and 20 THEN ' Average ' 
 ELSE ' Gift to impress relatives ' 
 END 
 GO 
 
你甚至还可以组合这些选项，添加一个 ORDER BY 子句，如下所示： 
 
 USE pubs 
 GO 
 SELECT 
 CASE 
 WHEN price IS NULL THEN ' Unpriced ' 
 WHEN price <</SPAN> 10 THEN ' Bargain ' 
 WHEN price BETWEEN 10 and 20 THEN ' Average ' 
 ELSE ' Gift to impress relatives ' 
 END AS Range, 
 Title 
 FROM titles 
 GROUP BY 
 CASE 
 WHEN price IS NULL THEN ' Unpriced ' 
 WHEN price <</SPAN> 10 THEN ' Bargain ' 
 WHEN price BETWEEN 10 and 20 THEN ' Average ' 
 ELSE ' Gift to impress relatives ' 
 END , 
 Title 
 ORDER BY 
 CASE 
 WHEN price IS NULL THEN ' Unpriced ' 
 WHEN price <</SPAN> 10 THEN ' Bargain ' 
 WHEN price BETWEEN 10 and 20 THEN ' Average ' 
 ELSE ' Gift to impress relatives ' 
 END , 
 Title 
 GO 
 
注意，为了在 GROUP BY 块中使用 CASE ，查询语句需要在 GROUP BY 块中重复 SELECT 块中的 CASE 块。 
 
除了选择自定义字段之外，在很多情况下 CASE 都非常有用。再深入一步，你还可以得到你以前认为不可能得到的分组排序结果集。 

[zaytsing]

感谢大哥大姐和各位父老乡亲的照顾。。