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
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, ',')
其他回答
一个简单的优化算法:
ALTER FUNCTION [dbo].[Split]( @Text NVARCHAR(200),@Splitor CHAR(1) )
RETURNS @Result TABLE ( value NVARCHAR(50))
AS
BEGIN
DECLARE @PathInd INT
Set @Text+=@Splitor
WHILE LEN(@Text) > 0
BEGIN
SET @PathInd=PATINDEX('%'+@Splitor+'%',@Text)
INSERT INTO @Result VALUES(SUBSTRING(@Text, 0, @PathInd))
SET @Text= SUBSTRING(@Text, @PathInd+1, LEN(@Text))
END
RETURN
END
几乎所有其他答案都是替换正在分割的字符串,这浪费了CPU周期并执行不必要的内存分配。
我在这里介绍了一种更好的进行字符串拆分的方法:http://www.digitalruby.com/split-string-sql-server/
代码如下:
SET NOCOUNT ON
-- You will want to change nvarchar(MAX) to nvarchar(50), varchar(50) or whatever matches exactly with the string column you will be searching against
DECLARE @SplitStringTable TABLE (Value nvarchar(MAX) NOT NULL)
DECLARE @StringToSplit nvarchar(MAX) = 'your|string|to|split|here'
DECLARE @SplitEndPos int
DECLARE @SplitValue nvarchar(MAX)
DECLARE @SplitDelim nvarchar(1) = '|'
DECLARE @SplitStartPos int = 1
SET @SplitEndPos = CHARINDEX(@SplitDelim, @StringToSplit, @SplitStartPos)
WHILE @SplitEndPos > 0
BEGIN
SET @SplitValue = SUBSTRING(@StringToSplit, @SplitStartPos, (@SplitEndPos - @SplitStartPos))
INSERT @SplitStringTable (Value) VALUES (@SplitValue)
SET @SplitStartPos = @SplitEndPos + 1
SET @SplitEndPos = CHARINDEX(@SplitDelim, @StringToSplit, @SplitStartPos)
END
SET @SplitValue = SUBSTRING(@StringToSplit, @SplitStartPos, 2147483647)
INSERT @SplitStringTable (Value) VALUES(@SplitValue)
SET NOCOUNT OFF
-- You can select or join with the values in @SplitStringTable at this point.
虽然类似于josejuan基于XML的回答,但我发现只处理一次XML路径,然后旋转稍微更有效:
select ID,
[3] as PathProvidingID,
[4] as PathProvider,
[5] as ComponentProvidingID,
[6] as ComponentProviding,
[7] as InputRecievingID,
[8] as InputRecieving,
[9] as RowsPassed,
[10] as InputRecieving2
from
(
select id,message,d.* from sysssislog cross apply (
SELECT Item = y.i.value('(./text())[1]', 'varchar(200)'),
row_number() over(order by y.i) as rn
FROM
(
SELECT x = CONVERT(XML, '<i>' + REPLACE(Message, ':', '</i><i>') + '</i>').query('.')
) AS a CROSS APPLY x.nodes('i') AS y(i)
) d
WHERE event
=
'OnPipelineRowsSent'
) as tokens
pivot
( max(item) for [rn] in ([3],[4],[5],[6],[7],[8],[9],[10])
) as data
8:30开始
select id,
tokens.value('(/n[3])', 'varchar(100)')as PathProvidingID,
tokens.value('(/n[4])', 'varchar(100)') as PathProvider,
tokens.value('(/n[5])', 'varchar(100)') as ComponentProvidingID,
tokens.value('(/n[6])', 'varchar(100)') as ComponentProviding,
tokens.value('(/n[7])', 'varchar(100)') as InputRecievingID,
tokens.value('(/n[8])', 'varchar(100)') as InputRecieving,
tokens.value('(/n[9])', 'varchar(100)') as RowsPassed
from
(
select id, Convert(xml,'<n>'+Replace(message,'.','</n><n>')+'</n>') tokens
from sysssislog
WHERE event
=
'OnPipelineRowsSent'
) as data
9点20分跑
从SQL Server 2016开始,我们使用string_split
DECLARE @string varchar(100) = 'Richard, Mike, Mark'
SELECT value FROM string_split(@string, ',')
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