I would tend to be very suspicious of any set of universal best practices because, for most of these fields, the devil is in the details.Just because the information is relatively common doesn't mean that your application uses the data in exactly the same way that other applications use it.You can contact the Zoosk customer service department, but only by phone or mail. The mailing address was not found on the website where users can easily access the information. PST, but that information is not listed with the customer service phone number.

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Taxes can apply at many levels, so if you can point a tax rate at an abstract geographic area, you are golden.

Geographic Area: Add line2, and line3 if you need to. Multiple people can live at an address, and a person can have multiple addresses at the same time, and over time, so you need a many-many table for that. A party can have multiple phone numbers, and a phone number can be used by multiple people. Phone Number The min might be 3 (for "911"), or maybe 7 ("310-4NET", which is a special kind of local number that does not allow you to dial the area code) You could split this into country code, etc if necessary.

320 should be more than enough for an email address (you can check the ANSI standard to be sure).

For address error on the side of caution with 255 characters.

Just because you are in the US doesn't mean that you don't want to accept foreign characters into your columns.

That said, I usually recommend 50 characters for names.She also told us there was no email address for the customer service department.Many good questions generate some degree of opinion based on expert experience, but answers to this question will tend to be almost entirely based on opinions, rather than facts, references, or specific expertise.Don't forget that state should be optional as many countries don't have states. Or 3 if you want to track local domain email addresses max: 254 (RFC) The amount of code to validate an email is actually insane, so let's just assume it's valid if it has a "@" You may want to abstract an email address as a "communication method", so that you can easily list all methods with which to communicate with a user.My bum is getting sore from sitting on the fence, so I am going to just throw out some answers and hope to not get down-voted into oblivion. Gender can change over time, so you could track that if it's important to you.We asked the hours of operation for customer service and she immediately answered without reserve.