This programmer pilot fish develops and maintains a custom manufacturing system for a client — and has been keeping it running for years.

“About four years ago, I created a report that looked at completed jobs for a given date range to compare on-time versus late deliveries,” says fish. “After I created the report, I didn’t receive any additional requests for changes or support.

“Until today. I was asked why there were errors appearing and no data on the report.

“After a quick review of the underlying queries, I realized from the way they were structured that I had unintentionally assumed that there would always be at least one job that shipped late.

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