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I've built a functioning database that has worked for months. Last night, while an employee was using it, three queries suddenly stopped working. I checked and all of the data still exists in the table, but queries which were fine before are suddenly failing to retrieve the data. Furthermore...

I have a table of data for subjects in a research study. There have been 5 rounds of data collection, so every subject has 5 rounds of data (phone numbers, etc). I need to generate a report that shows the subjects name and ID number, and then every phone number that has been recorded for them in...