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How to normalize events with multiple keys?

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I have a couple of fields, Node and NodeID, which will both have a number. Then I have NodeName which is of the format "Node001", so to make sure they all have a NodeName, I did this

eval NodeName="Node".substr("000".NodeId,-3) | eval NodeName = "Node".substr("000".Node,-3)

However, this seems rather wasteful. How would I combine this into one statement? It's unlikely an event will have both Node and NodeID, but I'd have to dig through the data more

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Try this

.... | eval NodeName="Node".substr("000", coalesce(NodeId, Node), -3)
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