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我目前正在尝试了解拆分功能以及如何实际使用它。我有一张桌子需要拆分，并认为我需要使用拆分（因此尝试学习）。但是我对如何让它工作感到困惑！

使用excel来模拟第一组数据就是这样。第二组是我想要的样子。 在此处输入图像描述

任何人都可以帮忙吗？

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2 回答 2

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对每一列使用字符串拆分函数，并使用union all后跟一个枢轴组合结果，以便以适当的方式检索您的值。

select P.SaveName, P.Para1, P.Para2, P.Para3, P.Para4, P.Para5, P.Para6
from (
     select T.SaveName, S.ID, S.Item, S.Para
     from YourTable as T 
       cross apply (select ID, Item, 'Para1' from dbo.SplitString(T.Para1, ',') union all
                    select ID, Item, 'Para2' from dbo.SplitString(T.Para2, ',') union all
                    select ID, Item, 'Para3' from dbo.SplitString(T.Para3, ',') union all
                    select ID, Item, 'Para4' from dbo.SplitString(T.Para4, ',') union all
                    select ID, Item, 'Para5' from dbo.SplitString(T.Para5, ',') union all
                    select ID, Item, 'Para6' from dbo.SplitString(T.Para6, ',')
                   ) as S(ID, Item, Para)
     ) as C
pivot (min(C.Item) for C.Para in (Para1, Para2, Para3, Para4, Para5, Para6)) as P
order by P.SaveName, P.ID

SQL小提琴

于 2013-09-04T13:48:30.773 回答
3

作为使用拆分函数的替代方法，您可以使用递归 common-table-expression拆分数据。

;with cte as
(
  select SaveName,
    cast(left(Para1, charindex(',',Para1+',')-1) as varchar(50)) para1,
    stuff(Para1, 1, charindex(',',Para1+','), '') para1list,
    cast(left(Para2, charindex(',',Para2+',')-1) as varchar(50)) para2,
    stuff(Para2, 1, charindex(',',Para2+','), '') para2list,
    cast(left(Para3, charindex(',',Para3+',')-1) as varchar(50)) para3,
    stuff(Para3, 1, charindex(',',Para3+','), '') para3list,
    cast(left(Para4, charindex(',',Para4+',')-1) as varchar(50)) para4,
    stuff(Para4, 1, charindex(',',Para4+','), '') para4list,
    cast(left(Para5, charindex(',',Para5+',')-1) as varchar(50)) para5,
    stuff(Para5, 1, charindex(',',Para5+','), '') para5list,
    cast(left(Para6, charindex(',',Para6+',')-1) as varchar(50)) para6,
    stuff(Para6, 1, charindex(',',Para6+','), '') para6list
  from yourtable
  union all
  select SaveName,
    cast(left(para1list, charindex(',',para1list+',')-1) as varchar(50)) para1,
    stuff(para1list, 1, charindex(',',para1list+','), '') para1list,
    cast(left(Para2list, charindex(',',Para2list+',')-1) as varchar(50)) para2,
    stuff(Para2list, 1, charindex(',',Para2list+','), '') para2list,
    cast(left(Para3list, charindex(',',Para3list+',')-1) as varchar(50)) para3,
    stuff(Para3list, 1, charindex(',',Para3list+','), '') para3list,
    cast(left(Para4list, charindex(',',Para4list+',')-1) as varchar(50)) para4,
    stuff(Para4list, 1, charindex(',',Para4list+','), '') para4list,
    cast(left(Para5list, charindex(',',Para5list+',')-1) as varchar(50)) para5,
    stuff(Para5list, 1, charindex(',',Para5list+','), '') para5list,
    cast(left(Para6list, charindex(',',Para6list+',')-1) as varchar(50)) para6,
    stuff(Para6list, 1, charindex(',',Para6list+','), '') para6list
  from cte
  where para1list > ''
    or para2list > ''
    or para3list > ''
    or para4list > ''
    or para5list > ''
    or para6list > ''
) 
select SaveName, para1, para2, para3, para4, para5, para6
from cte
order by savename;

请参阅带有演示的 SQL Fiddle

于 2013-09-04T14:24:11.800 回答