从 date/time table 计算 "age"

Question

我有一个格式为“13.10.2020 06:08:43”的 Date/Time 列，我需要从当前时间计算“年龄”。输出应该类似于给定的示例：“4h”，因为它的 10:08 atm - Date/Time 列是 4 小时前。我需要用 M 语言在 visual studio 2019 年使用。

我用过：

let

        Source = Sql.Database("xxxx", "xxxxx", [Query="SELECT#(lf)#(tab)storeid as 'Shop'#(lf)#(tab), concat('SCO', posnr) as POS#(lf)#(tab),  concat(datediff(hour,[LastTransactionDate]#(lf)#(tab), CURRENT_TIMESTAMP),' h') as 'Age'#(lf)#(tab), POSIPaddress as 'IP'#(lf)#(tab),[PosNr]#(lf)    ,[AdapterPosOrGroupId]#(lf)    ,[UpdatedOn]#(lf)    ,[LastTransactionDate]#(lf)    ,[LastStartDate]#(lf)    ,[Open]#(lf)    ,[Locked]#(lf)    ,[CashDisabled]#(lf)    ,[IsCashEnabled]#(lf)    ,[CashDevicesTraficLight]#(lf)    ,[POSIPAddress]#(lf)    ,[ScoPosServiceVersion]#(lf)    ,[WinScoVersion]#(lf)    ,[StoreType]#(lf)FROM [LaneEventDatabase ].[dbo].[POS.LaneCurrentState]"]),
        #"Added Conditional Column" = Table.AddColumn(Source, "Custom", each if [CashDevicesTraficLight] = "green" then 1 else if [CashDevicesTraficLight] = "yellow" then 2 else if [CashDevicesTraficLight] = "red" then 3 else 4),
        #"Changed Type" = Table.TransformColumnTypes(#"Added Conditional Column",{{"Custom", type number}})
    in
        #"Changed Type"

效果很好，但 visual studio 不喜欢处理源代码的方式，并且在部署时出现错误：

Failed to save modifications to the server. Error returned: 'An M partition uses a data function which results in access to a data source different from those defined in the model.

'.

Answer 1

只需使用以下代码创建一个新的自定义列-

= Text.From(
    (Duration.Days(DateTime.LocalNow()-[date]) * 24) +
    Duration.Hours(DateTime.LocalNow()-[date])
) & "h"

这是示例输出-

从 date/time table 计算 "age"

Calculate "age" from date/time table

m

visual-studio