摘要:本文主要向大家介绍了SQLServer数据库字段合并,通过具体的内容向大家展示,希望能对大家学习SQLServer数据库有所帮助。
本文主要向大家介绍了SQLServer数据库字段合并,通过具体的内容向大家展示,希望能对大家学习SQLServer数据库有所帮助。
--建立测试环境
IF OBJECT_ID('tb') IS NOT NULL DROP TABLE tb GO CREATE TABLE tb ( id int identity, houseName varchar(10), proid int, procount int ) GO INSERT TB SELECT 'A仓库',1,100 union all SELECT 'A仓库',2,50 union all SELECT 'B仓库',1,60 union all SELECT 'B仓库',2,70 --查询 --1 IF OBJECT_ID('f_getproid') IS NOT NULL DROP function f_getproid GO create function f_getproid (@houseName varchar(10)) returns varchar(50) as begin declare @s varchar(50) select @s=isnull(@s+',','')+ltrim(proid) from tb where houseName=@houseName return @s end go IF OBJECT_ID('f_getprocount') IS NOT NULL DROP function f_getprocount GO create function f_getprocount (@houseName varchar(10)) returns varchar(50) as begin declare @s varchar(50) select @s=isnull(@s+',','')+ltrim(procount) from tb where houseName=@houseName return @s end go select houseName,dbo.f_getproid(houseName)proid,dbo.f_getprocount(houseName)procount from tb group by houseName go --2 select houseName, stuff((select ','+ltrim(proid) from tb where houseName=t.houseName for xml path('')),1,1,'') proid, stuff((select ','+ltrim(procount) from tb where houseName=t.houseName for xml path('')),1,1,'') procount from tb t group by houseName --结果 /* (4 行受影响) houseName proid procount ---------- ----- -------- A仓库 1,2 100,50 B仓库 1,2 60,70 (2 行受影响) houseName proid procount ---------- ----- -------- A仓库 1,2 100,50 B仓库 1,2 60,70 (2 行受影响) */ /* 标题:按某字段合并字符串之一(简单合并) 作者:爱新觉罗.毓华(十八年风雨,守得冰山雪莲花开) 时间:2008-11-06 地点:广东深圳 描述:将如下形式的数据按id字段合并value字段。 id value ----- ------ 1 aa 1 bb 2 aaa 2 bbb 2 ccc 需要得到结果: id value ------ ----------- 1 aa,bb 2 aaa,bbb,ccc 即:group by id, 求 value 的和(字符串相加) */ --1、sql2000中只能用自定义的函数解决 create table tb(id int, value varchar(10)) insert into tb values(1, 'aa') insert into tb values(1, 'bb') insert into tb values(2, 'aaa') insert into tb values(2, 'bbb') insert into tb values(2, 'ccc') go create function dbo.f_str(@id int) returns varchar(100) as begin declare @str varchar(1000) set @str = '' select @str = @str + ',' + cast(value as varchar) from tb where id = @id set @str = right(@str , len(@str) - 1) return @str end go --调用函数 select id , value = dbo.f_str(id) from tb group by id drop function dbo.f_str drop table tb
--2、sql2005中的方法
create table tb(id int, value varchar(10)) insert into tb values(1, 'aa') insert into tb values(1, 'bb') insert into tb values(2, 'aaa') insert into tb values(2, 'bbb') insert into tb values(2, 'ccc') go select id, [value] = stuff((select ',' + [value] from tb t where id = tb.id for xml path('')) , 1 , 1 , '') from tb group by id drop table tb
--3、使用游标合并数据
create table tb(id int, value varchar(10)) insert into tb values(1, 'aa') insert into tb values(1, 'bb') insert into tb values(2, 'aaa') insert into tb values(2, 'bbb') insert into tb values(2, 'ccc') go declare @t table(id int,value varchar(100))--定义结果集表变量 --定义游标并进行合并处理 declare my_cursor cursor local for select id , value from tb declare @id_old int , @id int , @value varchar(10) , @s varchar(100) open my_cursor fetch my_cursor into @id , @value select @id_old = @id , @s='' while @@FETCH_STATUS = 0 begin if @id = @id_old select @s = @s + ',' + cast(@value as varchar) else begin insert @t values(@id_old , stuff(@s,1,1,'')) select @s = ',' + cast(@value as varchar) , @id_old = @id end fetch my_cursor into @id , @value END insert @t values(@id_old , stuff(@s,1,1,'')) close my_cursor deallocate my_cursor select * from @t drop table tb
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