使用SQL Server,我如何分割一个字符串,以便我可以访问项目x?
拿一根“你好,约翰·史密斯”的绳子。我如何通过空格分割字符串并访问索引1应该返回“约翰”的项目?
使用SQL Server,我如何分割一个字符串,以便我可以访问项目x?
拿一根“你好,约翰·史密斯”的绳子。我如何通过空格分割字符串并访问索引1应该返回“约翰”的项目?
当前回答
在这里我发布了一个简单的解决方法
CREATE FUNCTION [dbo].[split](
@delimited NVARCHAR(MAX),
@delimiter NVARCHAR(100)
) RETURNS @t TABLE (id INT IDENTITY(1,1), val NVARCHAR(MAX))
AS
BEGIN
DECLARE @xml XML
SET @xml = N'<t>' + REPLACE(@delimited,@delimiter,'</t><t>') + '</t>'
INSERT INTO @t(val)
SELECT r.value('.','varchar(MAX)') as item
FROM @xml.nodes('/t') as records(r)
RETURN
END
像这样执行函数
select * from dbo.split('Hello John Smith',' ')
其他回答
试试这个:
CREATE function [SplitWordList]
(
@list varchar(8000)
)
returns @t table
(
Word varchar(50) not null,
Position int identity(1,1) not null
)
as begin
declare
@pos int,
@lpos int,
@item varchar(100),
@ignore varchar(100),
@dl int,
@a1 int,
@a2 int,
@z1 int,
@z2 int,
@n1 int,
@n2 int,
@c varchar(1),
@a smallint
select
@a1 = ascii('a'),
@a2 = ascii('A'),
@z1 = ascii('z'),
@z2 = ascii('Z'),
@n1 = ascii('0'),
@n2 = ascii('9')
set @ignore = '''"'
set @pos = 1
set @dl = datalength(@list)
set @lpos = 1
set @item = ''
while (@pos <= @dl) begin
set @c = substring(@list, @pos, 1)
if (@ignore not like '%' + @c + '%') begin
set @a = ascii(@c)
if ((@a >= @a1) and (@a <= @z1))
or ((@a >= @a2) and (@a <= @z2))
or ((@a >= @n1) and (@a <= @n2))
begin
set @item = @item + @c
end else if (@item > '') begin
insert into @t values (@item)
set @item = ''
end
end
set @pos = @pos + 1
end
if (@item > '') begin
insert into @t values (@item)
end
return
end
像这样测试它:
select * from SplitWordList('Hello John Smith')
在Azure SQL数据库(基于Microsoft SQL Server但不完全相同的东西)中,STRING_SPLIT函数的签名看起来像这样:
STRING_SPLIT ( string , separator [ , enable_ordinal ] )
当enable_ordinal标志设置为1时,结果将包括一个名为ordinal的列,该列由输入字符串中子字符串的基于1的位置组成:
SELECT *
FROM STRING_SPLIT('hello john smith', ' ', 1)
| value | ordinal |
|-------|---------|
| hello | 1 |
| john | 2 |
| smith | 3 |
这允许我们这样做:
SELECT value
FROM STRING_SPLIT('hello john smith', ' ', 1)
WHERE ordinal = 2
| value |
|-------|
| john |
如果enable_ordinal不可用,则有一个技巧,即假定输入字符串中的子字符串是惟一的。在这种情况下,CHAR_INDEX可以用来查找子字符串在输入字符串中的位置:
SELECT value, ROW_NUMBER() OVER (ORDER BY CHARINDEX(value, input_str)) AS ord_pos
FROM (VALUES
('hello john smith')
) AS x(input_str)
CROSS APPLY STRING_SPLIT(input_str, ' ')
| value | ord_pos |
|-------+---------|
| hello | 1 |
| john | 2 |
| smith | 3 |
我在网上寻找解决方案,下面的工作对我来说。 Ref。
然后像这样调用函数:
SELECT * FROM dbo.split('ram shyam hari gopal',' ')
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE FUNCTION [dbo].[Split](@String VARCHAR(8000), @Delimiter CHAR(1))
RETURNS @temptable TABLE (items VARCHAR(8000))
AS
BEGIN
DECLARE @idx INT
DECLARE @slice VARCHAR(8000)
SELECT @idx = 1
IF len(@String)<1 OR @String IS NULL RETURN
WHILE @idx!= 0
BEGIN
SET @idx = charindex(@Delimiter,@String)
IF @idx!=0
SET @slice = LEFT(@String,@idx - 1)
ELSE
SET @slice = @String
IF(len(@slice)>0)
INSERT INTO @temptable(Items) VALUES(@slice)
SET @String = RIGHT(@String,len(@String) - @idx)
IF len(@String) = 0 break
END
RETURN
END
CREATE TABLE test(
id int,
adress varchar(100)
);
INSERT INTO test VALUES(1, 'Ludovic Aubert, 42 rue de la Victoire, 75009, Paris, France'),(2, 'Jose Garcia, 1 Calle de la Victoria, 56500 Barcelona, Espana');
SELECT id, value, COUNT(*) OVER (PARTITION BY id) AS n, ROW_NUMBER() OVER (PARTITION BY id ORDER BY (SELECT NULL)) AS rn, adress
FROM test
CROSS APPLY STRING_SPLIT(adress, ',')
使用字符串和values()语句怎么样?
DECLARE @str varchar(max)
SET @str = 'Hello John Smith'
DECLARE @separator varchar(max)
SET @separator = ' '
DECLARE @Splited TABLE(id int IDENTITY(1,1), item varchar(max))
SET @str = REPLACE(@str, @separator, '''),(''')
SET @str = 'SELECT * FROM (VALUES(''' + @str + ''')) AS V(A)'
INSERT INTO @Splited
EXEC(@str)
SELECT * FROM @Splited
结果集。
id item
1 Hello
2 John
3 Smith