T-SQL如何将逗号分隔的数字字符串转换为整数
我收到错误“将nvarchar值'23,24,3,45,91'转换为int数据类型时转换失败”。错误似乎发生在on子句上。E.ID是一个整数字段,而F.Legassise是一个由逗号分隔的整数组成的varchar字段。下面是出现该错误的代码T-SQL如何将逗号分隔的数字字符串转换为整数,sql,string,comma,delimited,Sql,String,Comma,Delimited,我收到错误“将nvarchar值'23,24,3,45,91'转换为int数据类型时转换失败”。错误似乎发生在on子句上。E.ID是一个整数字段,而F.Legassise是一个由逗号分隔的整数组成的varchar字段。下面是出现该错误的代码 SELECT F.[FDTitle], E.PrimaryOpID as [FD Primary OP ID], F.County as [FD County], F.Status as [FD Status], F.IssueDate as [FD Dat
SELECT F.[FDTitle], E.PrimaryOpID as [FD Primary OP ID], F.County as [FD County], F.Status as [FD Status], F.IssueDate as [FD Date]
FROM [dbo].[tbl_FinalDetMain] F
LEFT OUTER JOIN [dbo].[tbl_lk_Exemptions_FD] E ON E.ID = F.LegalIssue
WHERE F.[FDNbr] = '2013-0041'
我已经为on子句尝试了下面的代码,但它只返回一个整数值,而不是整串整数
E.ID = cast(LEFT(F.LegalIssue,PATINDEX('%[^0-9]%',F.LegalIssue)-1) as int)
结果应包括五个以逗号分隔的整数 您要么将F.legalise规范化为多行,要么使用类似的 差不多
CAST(E.ID A VARCHAR(50)) = F.LegalIssue
OR F.LegalIssue LIKE CAST(E.ID A VARCHAR(50)) + ',%'
OR '%,' + F.LegalIssue LIKE CAST(E.ID A VARCHAR(50)) + ',%'
OR '%,' + F.LegalIssue LIKE CAST(E.ID A VARCHAR(50))
如您所见,表的实际设计是问题所在。您应该避免当前的设计,选择1对多
或多对多
设计
下面是如何使用递归CTE展平值的演示
创建测试表和数据
CREATE TABLE Tada(
ID INT,
SomeCommaString VARCHAR(50)
)
INSERT INTO Tada Values (1, '10'),(2,'5,6,12,16')
把桌子弄平
;WITH Vals AS (
SELECT
ID,
CASE
WHEN CHARINDEX(',',SomeCommaString) = 0
THEN SomeCommaString
WHEN CHARINDEX(',',SomeCommaString) > 0
THEN LEFT(SomeCommaString,CHARINDEX(',',SomeCommaString) - 1)
END Val,
CASE
WHEN CHARINDEX(',',SomeCommaString) > 0
THEN RIGHT(SomeCommaString,LEN(SomeCommaString) - CHARINDEX(',',SomeCommaString))
ELSE NULL
END Remainder
FROM Tada
UNION ALL
SELECT
ID,
CASE
WHEN CHARINDEX(',',Remainder) = 0
THEN Remainder
WHEN CHARINDEX(',',Remainder) > 0
THEN LEFT(Remainder,CHARINDEX(',',Remainder) - 1)
END Val,
CASE
WHEN CHARINDEX(',',Remainder) > 0
THEN RIGHT(Remainder,LEN(Remainder) - CHARINDEX(',',Remainder))
ELSE NULL
END Remainder
FROM Vals
WHERE Remainder IS NOT NULL
)
SELECT ID, Val
FROM Vals
如果
legasisue
包含一个逗号分隔的数字字符串,那么您确实需要一个关联表。缺少这一点,以下是一种方便(但不是有效)的连接方式:
SELECT F.[FDTitle], E.PrimaryOpID as [FD Primary OP ID], F.County as [FD County],
F.Status as [FD Status], F.IssueDate as [FD Date]
FROM [dbo].[tbl_FinalDetMain] F LEFT OUTER JOIN
[dbo].[tbl_lk_Exemptions_FD] E
ON ','+F.LegalIssue+',' like '%,'cast(E.ID as varchar(255))+',%'
WHERE F.[FDNbr] = '2013-0041';
这会在列表前后加逗号以避免冲突,例如在“11001000”中查找“10”。使用xml数据类型,可以将字符串分解为如下所示的整数。对于用户定义的函数,我会说:-)
declare@test varchar(最大值)
设置@test='1,2,3,4,5'
挑选
T2.item.value('(./text())[1]',int')
从…起
(选择转换(xml,“+替换(@test,”,“)+”)为xmldoc)
作为xmltable
交叉应用xmltable.xmldoc.nodes('/items/t')作为T2(item)
请停止在单个列中存储逗号分隔的列表。你可能认为这是一个聪明和有用的设计,但它造成的问题多于它解决的问题。数据库不是JSON容器!
declare @test varchar(max)
set @test = '1,2,3,4,5'
select
T2.item.value('(./text())[1]','int')
from
(select convert(xml,'<items><t>'+replace(@test,',','</t><t>')+'</t></items>') as xmldoc)
as xmltable
CROSS APPLY xmltable.xmldoc.nodes('/items/t') as T2(item)