Question

我正在创建以下查询来计算每周磁盘空间差异，但是当年份更改时，它将显示错误的数据，我该如何处理？

select T.*, [Weekly Diff] = T.FreeGB - T1.FreeGB, [Monthely Diff]= T.FreeGB - T2.FreeGB, T1.*,T2.* From 
(SELECT  *, [Week No]= datepart(WEEK,CreatedDate),[Month No] = datepart(MONTH,CreatedDate), [Year] =datepart(YEAR,CreatedDate) FROM  Disk_Space ) T 
LEFT JOIN  (SELECT  *
,[Week No]= datepart(WEEK,CreatedDate),[Month No] = datepart(MONTH,CreatedDate), [Year] =datepart(YEAR,CreatedDate) FROM  Disk_Space ) T1 
on T1.[Week
 No] = T.[Week No] - 1 and T.Year = T1.Year and T.ServerName =     BT1.ServerName and T.Drive = T1.Drive

Answer 1

通过采取以下措施解决了此问题

选择T。*，[每周差异] = T.FreeGB-T1.FreeGB，[每月差异] = T.FreeGB-T2.FreeGB 从 DISK_SPACE T
左联接磁盘_空格T1 在DATEDIFF（week，T.createddate，T1.createddate）= 1和DATEDIFF（day，T.createddate，T1.createddate）= 7上并且T.ServerName = T1.ServerName和T.Drive = T1.Drive

希望当年份更改时两个字段之间的每周差异

1 个答案: