SQL - 案例陈述

Question

SQL 2008/2005

我在Case语句上有SQL查询语法问题 - 我正在寻找一些帮助.这是Case Statement上的一个简单的SQL语法问题.我已经在我的查询中评论了这个场景,我已经附上了..请建议继续前进..!

select   
    stuff(Dr.DrugNDCNbr,
          case when Dr.DrugNDCType in (50, 56) then 1 
               when Dr.DrugNDCType in (51, 57) then 6    
               when Dr.DrugNDCType = 52 then 10     
               -- when Dr.DrugNDCType = 49 then -- DO NOTHING .. GIVE THE ACTUAL VALUE
          end, 0, '0')   
    from drug Dr
    where Dr.drugnbrkey = 6284

Answer 1

它是您需要的嵌套CASE 表达式

select   
    case
         when Dr.DrugNDCType = 49 then Dr.DrugNDCNbr
         else
               stuff   (   Dr.DrugNDCNbr,
               case 
                       when Dr.DrugNDCType in (50, 56) then 1 
                       when Dr.DrugNDCType in (51, 57) then 6    
                       when Dr.DrugNDCType = 52 then 10     
               end, 0, '0')
    end

 from drug Dr
where Dr.drugnbrkey = 6284