if not object_id('Tab') is null drop table Tab Go Create table Tab([Col1] int,[Col2] nvarchar(1)) Insert Tab select 1,N'a' union all select 1,N'b' union all select 1,N'c' union all select 2,N'd' union all select 2,N'e' union all select 3,N'f' Go合并表:SQL2000用函数:go if object_id('F_Str') is not null drop function F_Str go create function F_Str(@Col1 int) returns nvarchar(100) as begin declare @S nvarchar(100) select @S=isnull(@S+',','')+Col2 from Tab where Col1=@Col1 return @S end go Select distinct Col1,Col2=dbo.F_Str(Col1) from TabgoSQL2005用XML:方法1:select a.Col1,Col2=stuff(b.Col2.value('/R[1]','nvarchar(max)'),1,1,'') from (select distinct COl1 from Tab) a Cross apply (select COl2=(select N','+Col2 from Tab where Col1=a.COl1 For XML PATH(''), ROOT('R'), TYPE))b方法2:select a.Col1,COl2=replace(b.Col2.value('/Tab[1]','nvarchar(max)'),char(44)+char(32),char(44)) from (select distinct COl1 from Tab) a cross apply (select Col2=(select COl2 from Tab where COl1=a.COl1 FOR XML AUTO, TYPE) .query('<Tab> {for $i in /Tab[position()<last()]/@COl2 return concat(string($i),",")} {concat("",string(/Tab[last()]/@COl2))} </Tab>') )bSQL05用CTE:;with roy as(select Col1,Col2,row=row_number()over(partition by COl1 order by COl1) from Tab) ,Roy2 as (select COl1,cast(COl2 as nvarchar(100))COl2,row from Roy where row=1 union all select a.Col1,cast(b.COl2+','+a.COl2 as nvarchar(100)),a.row from Roy a join Roy2 b on a.COl1=b.COl1 and a.row=b.row+1) select Col1,Col2 from Roy2 a where row=(select max(row) from roy where Col1=a.COl1) order by Col1 option (MAXRECURSION 0) 生成结果: /* Col1 COl2 ----------- ------------ 1 a,b,c 2 d,e 3 f(3 行受影响) */ 拆分表:--> --> (Roy)生成測試數據
if not object_id('Tab') is null drop table Tab Go Create table Tab([Col1] int,[COl2] nvarchar(5)) Insert Tab select 1,N'a,b,c' union all select 2,N'd,e' union all select 3,N'f' GoSQL2000用辅助表: if object_id('Tempdb..#Num') is not null drop table #Num go select top 100 ID=Identity(int,1,1) into #Num from syscolumns a,syscolumns b Select a.Col1,COl2=substring(a.Col2,b.ID,charindex(',',a.Col2+',',b.ID)-b.ID) from Tab a,#Num b where charindex(',',','+a.Col2,b.ID)=b.ID --也可用 substring(','+a.COl2,b.ID,1)=',' SQL2005用Xml:select a.COl1,b.Col2 from (select Col1,COl2=convert(xml,'<root><v>'+replace(COl2,',','</v><v>')+'</v></root>') from Tab)a outer apply (select Col2=C.v.value('.','nvarchar(100)') from a.COl2.nodes('/root/v')C(v))b SQL05用CTE:;with roy as (select Col1,COl2=cast(left(Col2,charindex(',',Col2+',')-1) as nvarchar(100)),Split=cast(stuff(COl2+',',1,charindex(',',Col2+','),'') as nvarchar(100)) from Tab union all select Col1,COl2=cast(left(Split,charindex(',',Split)-1) as nvarchar(100)),Split= cast(stuff(Split,1,charindex(',',Split),'') as nvarchar(100)) from Roy where split>'' ) select COl1,COl2 from roy order by COl1 option (MAXRECURSION 0)生成结果: /* Col1 COl2 ----------- ----- 1 a 1 b 1 c 2 d 2 e 3 f */
declare @t table(col char(20)) insert @t values('15') insert @t values('235') insert @t values('1') insert @t values('44') insert @t values('ppt')SELECT MAX(CAST(col AS DECIMAL(10,2))), SUM(CAST(col AS DECIMAL(10,2)))*1.0/COUNT(*) FROM @t WHERE ISNUMERIC(col)=1
declare @t table(col char(20)) insert @t values('15') insert @t values('235') insert @t values('1') insert @t values('44') insert @t values('ppt') SELECT MAX(CAST(col AS DECIMAL(10,2)))最大值, avg(CAST(col AS DECIMAL(10,2)))*1.0/COUNT(*)平均值 FROM @t WHERE ISNUMERIC(col)=1 /*最大值 平均值 --------------------------------------- --------------------------------------- 235.00 18.437500(1 行受影响) */
declare @t table (col char(30) insert @t value('15') insert @t value('235') insert @t value('1') insert @t value('44') insert @t value('ppt') select max(cast(col as decimal(10,2)))最大值 avg(cast(col as decimal(10,1)))*1.0/count(*) 平均值 from @t where ISNumeric(col)=1
if object_id('tb') is not null drop table tb go create table tb(name varchar(100)) go insert into tb select '15,235,1,44,ppt' union all select '33,55,88,doc,99' union all select '11,23,exc,87,135' go if object_id('uf_getmax') is not null drop function uf_getmax go create function uf_getmax(@name varchar(100)) returns int as begin declare @str varchar(10) declare @i int declare @t table(i int) set @name=@name+',' while @name<>'' begin set @str=substring(@name,1,charindex(',',@name)-1) set @name=replace(@name,@str+',','') if isnumeric(@str)=1 insert into @t select @str end select @i=max(i) from @t return @i end go if object_id('uf_getavg') is not null drop function uf_getavg go create function uf_getavg(@name varchar(100)) returns int as begin declare @str varchar(10) declare @i int declare @t table(i int) set @name=@name+',' while @name<>'' begin set @str=substring(@name,1,charindex(',',@name)-1) set @name=replace(@name,@str+',','') if isnumeric(@str)=1 insert into @t select @str end select @i=avg(i) from @t return @i end goselect 最大数=dbo.uf_getmax(name),平均值=dbo.uf_getavg(name) from tb最大数 平均值 ----------- ----------- 235 73 99 68 135 64(所影响的行数为 3 行)
/******************************************************************************************************************************************************
合并分拆表数据整理人:中国风(Roy)日期:2008.06.06
******************************************************************************************************************************************************/--> --> (Roy)生成測試數據
if not object_id('Tab') is null
drop table Tab
Go
Create table Tab([Col1] int,[Col2] nvarchar(1))
Insert Tab
select 1,N'a' union all
select 1,N'b' union all
select 1,N'c' union all
select 2,N'd' union all
select 2,N'e' union all
select 3,N'f'
Go合并表:SQL2000用函数:go
if object_id('F_Str') is not null
drop function F_Str
go
create function F_Str(@Col1 int)
returns nvarchar(100)
as
begin
declare @S nvarchar(100)
select @S=isnull(@S+',','')+Col2 from Tab where Col1=@Col1
return @S
end
go
Select distinct Col1,Col2=dbo.F_Str(Col1) from TabgoSQL2005用XML:方法1:select
a.Col1,Col2=stuff(b.Col2.value('/R[1]','nvarchar(max)'),1,1,'')
from
(select distinct COl1 from Tab) a
Cross apply
(select COl2=(select N','+Col2 from Tab where Col1=a.COl1 For XML PATH(''), ROOT('R'), TYPE))b方法2:select
a.Col1,COl2=replace(b.Col2.value('/Tab[1]','nvarchar(max)'),char(44)+char(32),char(44))
from
(select distinct COl1 from Tab) a
cross apply
(select Col2=(select COl2 from Tab where COl1=a.COl1 FOR XML AUTO, TYPE)
.query('<Tab>
{for $i in /Tab[position()<last()]/@COl2 return concat(string($i),",")}
{concat("",string(/Tab[last()]/@COl2))}
</Tab>')
)bSQL05用CTE:;with roy as(select Col1,Col2,row=row_number()over(partition by COl1 order by COl1) from Tab)
,Roy2 as
(select COl1,cast(COl2 as nvarchar(100))COl2,row from Roy where row=1
union all
select a.Col1,cast(b.COl2+','+a.COl2 as nvarchar(100)),a.row from Roy a join Roy2 b on a.COl1=b.COl1 and a.row=b.row+1)
select Col1,Col2 from Roy2 a where row=(select max(row) from roy where Col1=a.COl1) order by Col1 option (MAXRECURSION 0)
生成结果:
/*
Col1 COl2
----------- ------------
1 a,b,c
2 d,e
3 f(3 行受影响)
*/
拆分表:--> --> (Roy)生成測試數據
if not object_id('Tab') is null
drop table Tab
Go
Create table Tab([Col1] int,[COl2] nvarchar(5))
Insert Tab
select 1,N'a,b,c' union all
select 2,N'd,e' union all
select 3,N'f'
GoSQL2000用辅助表:
if object_id('Tempdb..#Num') is not null
drop table #Num
go
select top 100 ID=Identity(int,1,1) into #Num from syscolumns a,syscolumns b
Select
a.Col1,COl2=substring(a.Col2,b.ID,charindex(',',a.Col2+',',b.ID)-b.ID)
from
Tab a,#Num b
where
charindex(',',','+a.Col2,b.ID)=b.ID --也可用 substring(','+a.COl2,b.ID,1)=','
SQL2005用Xml:select
a.COl1,b.Col2
from
(select Col1,COl2=convert(xml,'<root><v>'+replace(COl2,',','</v><v>')+'</v></root>') from Tab)a
outer apply
(select Col2=C.v.value('.','nvarchar(100)') from a.COl2.nodes('/root/v')C(v))b
SQL05用CTE:;with roy as
(select Col1,COl2=cast(left(Col2,charindex(',',Col2+',')-1) as nvarchar(100)),Split=cast(stuff(COl2+',',1,charindex(',',Col2+','),'') as nvarchar(100)) from Tab
union all
select Col1,COl2=cast(left(Split,charindex(',',Split)-1) as nvarchar(100)),Split= cast(stuff(Split,1,charindex(',',Split),'') as nvarchar(100)) from Roy where split>''
)
select COl1,COl2 from roy order by COl1 option (MAXRECURSION 0)生成结果:
/*
Col1 COl2
----------- -----
1 a
1 b
1 c
2 d
2 e
3 f
*/
insert @t values('15')
insert @t values('235')
insert @t values('1')
insert @t values('44')
insert @t values('ppt')SELECT
MAX(CAST(col AS DECIMAL(10,2))),
SUM(CAST(col AS DECIMAL(10,2)))*1.0/COUNT(*)
FROM @t
WHERE ISNUMERIC(col)=1
insert @t values('15')
insert @t values('235')
insert @t values('1')
insert @t values('44')
insert @t values('ppt')
SELECT
MAX(CAST(col AS DECIMAL(10,2)))最大值,
avg(CAST(col AS DECIMAL(10,2)))*1.0/COUNT(*)平均值
FROM @t
WHERE ISNUMERIC(col)=1
/*最大值 平均值
--------------------------------------- ---------------------------------------
235.00 18.437500(1 行受影响)
*/
insert @t value('15')
insert @t value('235')
insert @t value('1')
insert @t value('44')
insert @t value('ppt')
select max(cast(col as decimal(10,2)))最大值
avg(cast(col as decimal(10,1)))*1.0/count(*) 平均值
from @t
where ISNumeric(col)=1
insert #t values('15')
insert #t values('235')
insert #t values('1')
insert #t values('44')
insert #t values('ppt')select max(cast(col as decimal(19,2)))'最大值',
sum(cast(col as decimal(19,2))*1.0)/count(*)'平均值' from #t
where isnumeric(col)=1ISNUMERIC ( expression )
如果输入表达式的计算值为有效的整数、浮点数、money 或 decimal 类型时,ISNUMERIC 返回 1;否则返回 0。返回值为 1 时,指示可将 expression 至少转换为上述数值类型中的一种。
if object_id('tb') is not null
drop table tb
go
create table tb(name varchar(100))
go
insert into tb
select '15,235,1,44,ppt' union all
select '33,55,88,doc,99' union all
select '11,23,exc,87,135'
go
if object_id('uf_getmax') is not null
drop function uf_getmax
go
create function uf_getmax(@name varchar(100))
returns int
as
begin
declare @str varchar(10)
declare @i int
declare @t table(i int)
set @name=@name+','
while @name<>''
begin
set @str=substring(@name,1,charindex(',',@name)-1)
set @name=replace(@name,@str+',','')
if isnumeric(@str)=1
insert into @t select @str
end
select @i=max(i) from @t
return @i
end
go
if object_id('uf_getavg') is not null
drop function uf_getavg
go
create function uf_getavg(@name varchar(100))
returns int
as
begin
declare @str varchar(10)
declare @i int
declare @t table(i int)
set @name=@name+','
while @name<>''
begin
set @str=substring(@name,1,charindex(',',@name)-1)
set @name=replace(@name,@str+',','')
if isnumeric(@str)=1
insert into @t select @str
end
select @i=avg(i) from @t
return @i
end
goselect 最大数=dbo.uf_getmax(name),平均值=dbo.uf_getavg(name) from tb最大数 平均值
----------- -----------
235 73
99 68
135 64(所影响的行数为 3 行)