Is email address a bad candidate for primary when compared to auto incrementing numbers?
Our web application needs the email address to be unique in the system. So, I thought of using email address as primary key. However my colleague suggests that string comparison will be slower than integer comparison.
Is it a valid reason to not use email as primary key?
We are using `PostgreSQL`.
Not only are strings inherently slower, but what if two people from the same household that share the same email address want to each register on the application?
