It collected user details such as names, emails, and phone numbers. I can still remember my first web application. That's an important consideration because it drives home the importance of generating useful defaults as well as front-end validation. In either case, you're looking for valid data, and not just filler. Other times, a non-null column might contain audit information, such as the user ID or a timestamp. Nullable columns don't present the same challenges as non-null ones do, so why not allow nulls in all non-key columns? In many instances, the point of applying the non-null constraint to a column is to force the application or system that populates it to supply a value. In today's follow-up blog, we'll tackle when to use default values, and how to come up with good ones. Part 1 explored the ramifications of MySQL's Strict SQL Mode, as well as how to view and set it using Navicat for MySQL 15. There are many reasons for providing default column values - some good, and some, less so. Hopefully you're also aware that keeping error messages at bay is not in-itself a valid reason for supplying default values. You probably already know that setting a default value on non-null columns helps get rid of those pesky "Field 'xyz' doesn't have a default value" errors. MySQL Default Values: Good or Bad? - Part 2: When To Use Them by Robert Gravelle Part 2: When To Use Them
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