Question

我有一个表格，其中版本值是nvarchar而不是整数，因此当我使用大于语句时，它不会撤回正确的数据

我正在尝试将版本转换为整数但收到错误，请帮助

Declare @dversion   int;

set @dversion = (select convert(int, displayversion) from Inv_AddRemoveProgram where DisplayName like 'Symantec Enterprise Vault%')

select distinct v1.name, v1.[user], t1.displayname, @dversion from vComputer v1

inner join Inv_AddRemoveProgram t1
on v1.Guid = t1._ResourceGuid

where t1.DisplayName like 'Symantec Enterprise Vault%'

and @dversion > '10.0.17573'

收到错误：消息245，级别16，状态1，行3 转换nvarchar值时转换失败＆＃39; 10.0.17573＆＃39;数据类型int。

我还尝试编写两个简单的查询来转换该表中的版本值，该值也没有用

select displayname, CONVERT(INT, displayversion) from Inv_AddRemoveProgram

Error:  Msg 245, Level 16, State 1, Line 1
Conversion failed when converting the nvarchar value '3.1.05160' to data type int.

select displayname, CAST(displayversion AS INT) from Inv_AddRemoveProgram

Error:  Msg 245, Level 16, State 1, Line 1
Conversion failed when converting the nvarchar value '3.1.05160' to data type int.

Answer 1

看起来您的问题可能是您正在尝试将float转换为int。或者，实际上，我不确定是什么类型的数字＆＃39; 3.1.05160＆＃39;可能。可能甚至不是一个带有两位小数的浮点数。

如果你想在这样的领域进行安排，我认为你需要将这个数字分成3个部分，然后将它们分成数字，然后按顺序排列？

Answer 2

你需要int in clausule。试试这个：

and @dversion > CAST(replace('10.0.17573', '.', '') as int)

Answer 3

试试这个：

DECLARE @t TABLE ( v NVARCHAR(20) )
INSERT  INTO @t
VALUES  ( '10.0.17573' ),
        ( '10.1.17573' ),
        ( '10.0.1753' ),
        ( '12.3.17573' ),
        ( '11.0.17573' ),
        ( '9.0.17573' ),
        ( '9.20.17573' )

SELECT  *
FROM    @t
WHERE   CAST(PARSENAME(v, 3) AS INT) > CAST(PARSENAME('10.0.17573', 3) AS INT)
        OR ( CAST(PARSENAME(v, 3) AS INT) >= CAST(PARSENAME('10.0.17573', 3) AS INT)
             AND CAST(PARSENAME(v, 2) AS INT) > CAST(PARSENAME('10.0.17573', 2) AS INT))
        OR ( CAST(PARSENAME(v, 3) AS INT) >= CAST(PARSENAME('10.0.17573', 3) AS INT)
             AND CAST(PARSENAME(v, 2) AS INT) >= CAST(PARSENAME('10.0.17573',2) AS INT)
             AND CAST(PARSENAME(v, 1) AS INT) > CAST(PARSENAME('10.0.17573',1) AS INT))

输出：

在SQL中将nvarchar转换为整数

3 个答案: