SQL server入门[第三章] T-SQL编程

tenexam<60
       if(@n>0)
           update stumarks set writtenexam = writtenexam+2
       else
           break
     end
print ''加分后的成绩为：''
select * from stumarks

……………………………………………………………………………………………………………………………………

> case 多分支语句

case
    when 条件1 then 结果1
    when 条件2 then 结果2
    ………
    else
end

select * form stumarks
select stuno,成绩 = case
   when writtenexam<60 then ''e''
   when writtenexam between 60 and 69 then ''d''
   when writtenexam between 70 and 79 then ''c''
   when writtenexam between 80 and 89 then ''b''
   else ''a''
end
from stumarks 

                                                                       author: k&j
                                                                       QQ:403455281
                                                                       16:51 2007-4-13