将列数据拆分为行的 SQL 查询 [英] SQL query to split column data into rows

问题描述

我有 sql 表，因为我有 2 个字段 No 和 declaration

I am having sql table in that I am having 2 fields as No and declaration

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

我需要将该代码的声明显示为:

I need to display the declaration for that code as:

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.

I need to split the column data to rows for that code.

推荐答案

对于这种类型的数据分离，我建议创建一个拆分函数:

For this type of data separation, I would suggest creating a split function:

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;

然后要在查询中使用它，您可以使用 outer apply 加入到您现有的表中:

Then to use this in a query you can use an outer apply to join to your existing table:

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

哪个会产生结果:

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

参见SQL Fiddle with Demo

或者你可以实现一个类似这样的 CTE 版本:

Or you can implement a CTE version similar to this:

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

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