分拆字符串并统计

create table #tb
(
 id int,
 col varchar(50),
 num int
)
insert into #tb select 1,'aa,bb,cc',10
union all select 2,'aa,aa,bb',20
union all select 3,'aa,aa,bb',20
union all select 4,'dd,ccc,c',30
union all select 5,'ddaa,ccc',40
union all select 6,'eee,ee,c',50

declare @Len int
select top 1 @Len=len(col)+1 from #tb order by len(col)
select @Len
set rowcount @Len
select ID=identity(int,1,1) into #TT from dbo.syscolumns A,dbo.syscolumns B
set rowcount 0
;with hgo as
(
   select b.id,
          number=substring(col,A.id,charindex(',',col+',',A.id)-A.id)
    from #TT A join #tb b on substring(','+col,A.id,1)=','
)
select number,count(distinct id) [count],count(number) [number] from hgo group by number