如何从PostgreSQL获取具有特定电子邮件域的用户？

Question

I want to get all users with a specific domain in their email. How can I accomplish this with a PostgreSQL command so I don't need to fetch all the users and then filter them out with Ruby?

where('user.email == ?', '*@domain.com')

What's the most efficient way to do this? split and then join ? Or is there a super command in PostgreSQL that you can use?

Answer 1

You're looking for the " like " command.

In particular you want something similar to:

'user.email like "%?"'

The % is a wildcard in like clauses, that tells PostgreSQL to find the string given at the end of the field being searched.

PostgreSQL supports regular expressions also, but like should be sufficient for what you're after.