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zantarel's avatar
zantarel
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1 year ago
Solved

Error Handling an empty source

Hi all  I'm querying ARG in PowerQuery, but one of my tables is returning empty, which is breaking the rest of the query. I have added error handling and i'm just trying to basically get an empty ta...
  • BA_Pete's avatar
    1 year ago

    Hi zantarel ,

     

    Not 100% sure what you mean by "one of my tables is returning empty" as there's a couple of ways to interpret this, but I'm assuming it's just completely void i.e. no columns or anything. If so, try something along these lines:

    let
        Source = #table(1, {{1}}),
        remCol = Table.RemoveColumns(Source,{"Column1"}),
        // Error handling from here ===>
        buildAltTable = #table({"id", "name", "type", "tenantId", "kind", "location", "resourceGroup", "subscriptionId", "managedBy", "sku", "plan", "properties", "tags", "identity", "zones", "extendedLocation"}, {}),
        repTable = if List.Count(Table.ColumnNames(remCol)) = 0 then buildAltTable else remCol
    in
        repTable

     

    Obviously this can be condensed into a single step, if you prefer, something like this:

    let
        Source = #table(1, {{1}}),
        remCol = Table.RemoveColumns(Source,{"Column1"}),
        // Error handling from here ===>
        repTable = if List.Count(Table.ColumnNames(remCol)) = 0
            then #table({"id", "name", "type", "tenantId", "kind", "location", "resourceGroup", "subscriptionId", "managedBy", "sku", "plan", "properties", "tags", "identity", "zones", "extendedLocation"}, {})
            else remCol
    in
        repTable

     

    Pete