我知道在SQL server中不能在WHERE子句中使用别名作为列名。虽然我目前拥有的过滤器似乎不起作用,但我已经多次尝试通过扩展名(仅LDF和MDF)过滤文件,但它不起作用。以下是我所拥有的,我想知道是否有人知道实现这一目标的方法。
我想在我的输出集中是在FileType列中具有LDF或MDF的行。
这是我尝试过的
SELECT DISTINCT
CWV.SystemName ,
CIL.CIL_INSTANCE_NAME AS [Instance Name] ,
CWV.DriveLetter ,
UPPER(RIGHT(CIDFP.physical_name, 3)) AS FileType ,
CIDFP.physical_name AS [Physical Name]
FROM CCS_InstanceDatabaseFilesProperty AS CIDFP
INNER JOIN CCS_INSTANCE_LIST AS CIL ON CIL.CIL_ID = CIDFP.CIL_ID
INNER JOIN CCS_InstanceServerProperty AS CSP ON CSP.CIL_ID = CIDFP.CIL_ID
LEFT OUTER JOIN CCS_Win32_Volume AS CWV ON CIL.CSL_ID = CWV.CSL_ID
AND LEFT(CIDFP.physical_name,
2) = CWV.DriveLetter
WHERE ( CWV.SystemName IS NOT NULL )
AND ( CWV.DriveLetter IS NOT NULL )
OR RIGHT(CIDFP.physical_name, 3) = 'mdf'
OR RIGHT(CIDFP.physical_name, 3) = 'ldf'
提前感谢您的输入/回答。
将WHERE子句改为:
WHERE ( CWV.SystemName IS NOT NULL )
AND ( CWV.DriveLetter IS NOT NULL )
AND (RIGHT(CIDFP.physical_name, 3) = 'mdf'
OR RIGHT(CIDFP.physical_name, 3) = 'ldf')
您的AND
/OR
逻辑没有正确分组
如果你想要驱动器不是空AND
physical_name = 'mdf' OR
'ldf'你可以改变它像这样:
WHERE CWV.SystemName IS NOT NULL
AND CWV.DriveLetter IS NOT NULL
AND RIGHT(CIDFP.physical_name, 3) in ('mdf', 'ldf')