Thursday, March 28, 2013

What does it mean when you check your field “email” so unique for each record?


Request created by mike j: What does it mean when your asked to make a field “email” so its unique for each record?

What does it mean when your asked to make a field “email” so its unique for each record?


Also how do you make it so the email must contain both an ‘@’ symbol and a ‘.’ in the string?


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Solution:


Answer by T. Ricky

You will need to tell us what programming language you are working with. Without this information we cannot answer the question about the @ and “.” in string.


As far as the unique email address I assume this error occurs when adding a record to your database table. Your database table probably has been defined to use email as the primary key. Primary keys cannot be used more than one time. Also, there can be only one record which does not have an email address (meaning null). If the field is not the primary key, but has been defined as a field with unique constraints, the same rules apply.


Answer by Oso

In addition no matter what language you choose, you will be using regular expressions. Look up email validations for whatever language you are currently using.


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What does it mean when you check your field “email” so unique for each record?

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