SQL 中 超簡單的模擬split

--> 測試數據: #T

if object_id('tempdb.dbo.#T') is not null drop table #T

create table #T (id int,name varchar(8))

insert into #T

select 1,'jame,job' union all

select 2,'paul,mc' union all

select 3,'carl';

--> 1. CTE 遞歸找分隔字符位置法：速度極快

with T (id,P1,P2) as

(

    select id,charindex(',',','+name),charindex(',',name+',')+1 from #T

    union all

    select a.id,b.P2,charindex(',',name+',',b.P2)+1 from #T a join T b on a.id=b.id where charindex(',',name+',',b.P2)>0

)

select a.id,name=substring(a.name+',',b.P1,b.P2 - b.P1 - 1) from #T a join T b on a.id=b.id order by 1