SQL查询将列数据拆分成行

我有sql表,因为我有2个字段为否和声明

Code  Declaration
123   a1-2 nos,a2- 230 nos,a3 - 5nos

我需要将该代码的声明显示为：

Code  Declaration 
123   a1 - 2nos 
123   a2 - 230nos 
123   a3 - 5nos

我需要将列数据拆分为该代码的行.

解决方法

对于这种类型的数据分离,我建议创建一个拆分函数：

create FUNCTION [dbo].[Split](@String varchar(MAX),@Delimiter char(1))       
returns @temptable TABLE (items varchar(MAX))       
as       
begin      
    declare @idx int       
    declare @slice varchar(8000)       

    select @idx = 1       
        if len(@String)<1 or @String is null  return       

    while @idx!= 0       
    begin       
        set @idx = charindex(@Delimiter,@String)       
        if @idx!=0       
            set @slice = left(@String,@idx - 1)       
        else       
            set @slice = @String       

        if(len(@slice)>0)  
            insert into @temptable(Items) values(@slice)       

        set @String = right(@String,len(@String) - @idx)       
        if len(@String) = 0 break       
    end   
return 
end;

然后在查询中使用它,您可以使用外部应用程序加入到现有表中：

select t1.code,s.items declaration
from yourtable t1
outer apply dbo.split(t1.declaration,',') s

这将产生结果：

| CODE |  DECLaraTION |
-----------------------
|  123 |     a1-2 nos |
|  123 |  a2- 230 nos |
|  123 |    a3 - 5nos |

见SQL Fiddle with Demo

或者您可以实现类似于此的CTE版本：

;with cte (code,DeclarationItem,Declaration) as
(
  select Code,cast(left(Declaration,charindex(',Declaration+',')-1) as varchar(50)) DeclarationItem,stuff(Declaration,1,'),'') Declaration
  from yourtable
  union all
  select code,'') Declaration
  from cte
  where Declaration > ''
) 
select code,DeclarationItem
from cte