Using replace_string and a datatable

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After some help with a kusto query please.


I have a datatable:


let ClientId = datatable (cloud_Id: string, ClientName: string)
"IDabc", "Client1",
"IDdef", "Client2",
"IDghi", "Client3",
"IDjkl", "Client4"


Then within my Logs in AppInsignts ... I have a column called: cloudAlpha


All - I want to do is when I am returning the cloudAlpha in the main query  - I want to return the ClientName column instead.


I don't understand why this does not work....


replace_string(cloudAlpha, cloud_Id, ClientName)




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