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The only way I could find to do this was to sort the dataset by timestamp and client id and then loop through it example by example with macros in hold the cumulative total and reset it each time a new client id is encountered. It works but it is VERY VERY slow - it's been running for 15 hours and still going. Most processes on this dataset take seconds....
Surely there has to be a better way of doing this?! (preferably using native operators)