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scavenging records not simply by date
Hello, All My database should help to track usage of some kind of tanks. There TWO events that can happen to a tank and that we want to track - event "0" (cleaning) and event "1" (using). The aim is to delete old events from EventLog table. Event is old, if it had happened before last cleaning... -
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complicated subtotal of field value
Hello, All My database should help to track usage of some kind of tanks. There TWO events that can happen to a tank and that we want to track - event "0" (cleaning) and event "1" (using). The aim is to count how many times was every tank used after it was cleaned. All events are entered into...