字符串整理系列

原帖地址:http://topic.csdn.net/u/20090209/08/a945701c-e0d5-40cb-85f2-f4f56ac2999b.html

--(1)字符串分拆并统计 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 --(2)分拆字符串求和 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) desc set rowcount @len select id=identity(int,1,1) into # from dbo.syscolumns A,dbo.syscolumns B set rowcount 0 ;with hgo as ( select distinct data=substring(A.col,b.id,charindex(',',A.col+',',b.id)-b.id), A.num,b.id from #tb A,# b where substring(','+A.col,b.id,1)=',' ) select data,sum(num) from hgo group by data --(3)合并法(函数) create table tb1 ( col1 varchar(10), col2 int ) insert into tb1 select 'a',1 union all select 'a',2 union all select 'b',1 union all select 'b',2 union all select 'b',3 create function dbo.FC_Str(@col1 varchar(100)) returns varchar(100) as begin declare @i varchar(100) set @i='' select @i=@i+','+cast(col2 as varchar) from tb1 where col1=@col1 return(stuff(@i,1,1,'')) end select col1,dbo.FC_Str(col1) from tb1 group by col1 --(4)固定行合并法 create table #tb ( col1 varchar(10), col2 int ) insert into #tb select 'a',1 union all select 'a',2 union all select 'b',1 union all select 'b',2 union all select 'c',3 select col1, col2=cast(min(col2) as varchar)+ case when count(*)=1 then '' else +','+cast(max(col2) as varchar) end from #tb group by col1 --(5)临时表合并法 if object_id('tb') is not null drop table tb create table tb ( col1 varchar(10), col2 int ) insert into tb select 'a',1 union all select 'a',2 union all select 'b',1 union all select 'b',2 union all select 'b',3 select col1,col2=cast(col2 as varchar(100)) into #t1 from tb order by col1,col2 declare @col1 varchar(20) declare @col2 varchar(100) update #t1 set @col2= case when @col1=col1 then @col2+ ',' +col2 else col2 end, @col1=col1, col2=@col2 select * from #t1 select col1,col2=max(col2) from #t1 group by col1 --(6)字符串拆分 create function FC_SlpitStr(@Str nvarchar(4000),@Split nvarchar(100)) returns @R table (Col nvarchar(100)) as begin declare @StrLen int set @StrLen=len(@Str) while charindex(@Split,@StrLen)>0 begin insert into @R values(left(@Str,charindex(@Split,@StrLen)-1)) set @Str=stuff(@Str,1,charindex(@Split,@StrLen),'') end insert into @R values(@Str) return end declare @a nvarchar(4000) set @a='1,23,a' select dbo.FC_SlpitStr(@a,',') --(2)动态T-sql语句 declare @S varchar(100) set @s='1,23,a' declare @sql varchar(100) set @sql='select col='''+replace(@S, ',' , ''' union all select ''')+'''' print(@sql) --(8)分拆数据到列 ;declare @tb table ( col varchar(20) ) insert into @tb select 'aa,bb,cc' union all select 'AAA,BB' union all select 'AAA' declare @i int,@j varchar set @j=1 select col+',' as col into #t1 from @tb--加上',' select @i=max(len(Col)-len(replace(Col,',',''))) from #t1 while @j!>@i begin exec('alter table #t1 add [Col'+@j+'] varchar(10)') exec('update #t1 set [Col'+@j+']=left(col,charindex('','',col)-1),col=stuff(col,1,charindex('','',col),'''') where Len(col)>1') set @j=@j+1 end alter table #T1 drop column Col select * from #t1 drop table #t1; /* Col1 Col2 Col3 ---------- ---------- ---------- aa bb cc AAA BB NULL AAA NULL NULL */ --(9)字符串分拆并统计 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 number count number -------------------------------------------------- ----------- ----------- aa 3 5 bb 3 3 c 2 2 cc 1 1 ccc 2 2 dd 1 1 ddaa 1 1 ee 1 1 eee 1 1 (9 行受影响)