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I have a large dataset (~1 million rows) of three variables: ID (patient's name), DATE (of appointment) and DIAGNOSIS (given on that date). Patients may have been assigned more than one diagnosis at any one appointment - leading to two rows, same ID and DATE but different DIAGNOSIS. The diagnoses may change between appointments. I want to subset the data in two ways: - define groups

I am trying to write a custom formatter to update a database record based on example results. Having a lot of trouble, so I thought to ask if anyone has a custom formatter that writes results to a database or outputs results in JSON or some other programmatic format. A working example will go a long way in helping me work thru my own use case. Thanks -------------- next part -------------- An