要把字符串中的每个字符插入一个表中当做一行,
如字符串 str="my'sql数据库2000"
插入表后变成:
a(字段)
-----------
m
y
'
s
q
l
数
据
库
2
0
0
0
-----------想了想不知除了循环外还有什么方法更效率些,期待高手,谢谢了!
如字符串 str="my'sql数据库2000"
插入表后变成:
a(字段)
-----------
m
y
'
s
q
l
数
据
库
2
0
0
0
-----------想了想不知除了循环外还有什么方法更效率些,期待高手,谢谢了!
go
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
if object_id('dbo.f_str') is not null drop function dbo.f_str
go
create function dbo.f_str(@id int)
returns varchar(100)
as
begin
declare @str varchar(1000)
select @str = isnull(@str + ',','') + cast(value as varchar) from tb where id = @id
return @str
end
go--调用函数
select id , value = dbo.f_str(id) from tb group by iddrop function dbo.f_str
drop table tb
/*
id value
----------- ----------------------------------------------------------------------------------------------------
1 aa,bb
2 aaa,bbb,ccc(2 行受影响)
*/
IF OBJECT_ID('[tb]') IS NOT NULL
DROP TABLE [tb]
GO
CREATE TABLE [tb] ([a] [nvarchar](10))
INSERT INTO [tb]
SELECT 'm' UNION ALL
SELECT 'y' UNION ALL
SELECT 's' UNION ALL
SELECT 'q' UNION ALL
SELECT 'l' UNION ALL
SELECT '数' UNION ALL
SELECT '据' UNION ALL
SELECT '库' UNION ALL
SELECT '2' UNION ALL
SELECT '0' UNION ALL
SELECT '0' UNION ALL
SELECT '0'--SELECT * FROM [tb]-->SQL查询如下:
IF OBJECT_ID('dbo.f_str') IS NOT NULL
DROP FUNCTION dbo.f_str
GOCREATE FUNCTION dbo.f_str()
RETURNS VARCHAR(100)
AS
BEGIN
DECLARE @str VARCHAR(1000)
SELECT @str = ISNULL(@str, '')+CAST(a AS VARCHAR)
FROM tb
RETURN @str
END
GO
--调用函数
SELECT DISTINCT a = dbo.f_str()
FROM tb
/*
a
----------------------------------------------------------------------------------------------------
mysql数据库2000(1 行受影响)
*/
IF OBJECT_ID('[tb]') IS NOT NULL
DROP TABLE [tb]
GO
CREATE TABLE [tb] ([a] [nvarchar](10))
INSERT INTO [tb]
SELECT 'm' UNION ALL
SELECT 'y' UNION ALL
SELECT '''' UNION ALL
SELECT 's' UNION ALL
SELECT 'q' UNION ALL
SELECT 'l' UNION ALL
SELECT '数' UNION ALL
SELECT '据' UNION ALL
SELECT '库' UNION ALL
SELECT '2' UNION ALL
SELECT '0' UNION ALL
SELECT '0' UNION ALL
SELECT '0'--SELECT * FROM [tb]-->SQL查询如下:
DECLARE @str VARCHAR(40)
SELECT @str=ISNULL(@str,'')+a FROM tb
PRINT @str
--my'sql数据库2000
DECLARE @str VARCHAR(100)
SET @str = 'my''sql数据库2000'
SELECT number , SUBSTRING(@str,number+1,1)
FROM [master]..spt_values b
WHERE LEN(@str) > b.number AND TYPE='p'number
----------- ----
0 m
1 y
2 '
3 s
4 q
5 l
6 数
7 据
8 库
9 2
10 0
11 0
12 0(13 行受影响)