Question

我正在尝试查询关系存储，以返回在数据包（broadcast.FirmwareVersionReported）中报告的值不同的对象与上次传递的值（device.firmwareid）相比较。

列broadcast.FirmwareVersionReported的类型为varchar
值示例为001。
列device.firmwareid的类型为int。
值示例为0001XX。

测试

我尝试使用LEFT从列firmware.softwareid中移除最后两个字符来平衡比赛场地，并使用CAST将两者都更改为VARCHAR以进行比较。但很明显，这种做法并不正确。

select 
    LEFT(CAST(firmware.softwareid as VARCHAR),4) AS softwareid, 
    CAST(broadcast.[FirmwareVersionReported] as VARCHAR) 
from 
    device
inner join 
    broadcast on broadcast.deviceid = device.deviceid
inner join 
    firmware on firmware.firmwareid = device.firmwareid
where
    softwareid <> [FirmwareVersionReported]

结果

Msg 468，Level 16，State 9，Line 7
无法在不等于操作的情况下解决“SQL_Latin1_General_CP1_CI_AS”和“Latin1_General_CI_AS”之间的排序规则冲突。

表格

广播

[DeviceId] [int],
[FirmwareVersionReported] [varchar](10),

固件

[FirmwareID] [int] IDENTITY(1,1),
[SoftwareID] [varchar](10),
[PacketSoftwareID] [varchar](10),

设备

[DeviceID] [int] IDENTITY(1,1),
[FirmwareID] [int],

问题

请寻求有关如何最好地解决此问题的建议。

Answer 1

不是转换为char，而是转换为int进行比较：

select 
    LEFT(CAST(firmware.softwareid as VARCHAR),4) AS softwareid, 
    CAST(broadcast.[FirmwareVersionReported] as VARCHAR) 
from device
    inner join broadcast on broadcast.deviceid = device.deviceid
    inner join firmware on firmware.firmwareid = device.firmwareid
WHERE floor(cast(softwareid as int)/100) <> cast([FirmwareVersionReported] as int)

Answer 2

enter code here
select 
    LEFT(CAST(firmware.softwareid as VARCHAR),4) AS softwareid_mod, 
    CAST(broadcast.[FirmwareVersionReported] as VARCHAR) 
from device
    inner join broadcast on broadcast.deviceid = device.deviceid
    inner join firmware on firmware.firmwareid = device.firmwareid
WHERE LEFT(CAST(firmware.softwareid as VARCHAR),4) COLLATE DATABASE_DEFAULT <> [FirmwareVersionReported] COLLATE DATABASE_DEFAULT

T-SQL如何将varchar字母数字值与int值

2 个答案: