Question

I am hoping to do something like:

SELECT client.id FROM client RIGHT JOIN ('[e-mail]', '[e-mail]', ...);

I have the following “client” table:

id   email
1    [e-mail]
2    [e-mail]

The user inputs a list of email addresses that he wants to invite, and I need to get the following result:

email_to_invite  client.id
[e-mail]      NULL
[e-mail]          1

so that I know who is already in the DB (and get’s a message with the internal message system), and who I need to invite by email (client.id IS NULL)

SOLUTION: (Thanks to Joe Stefanelli)

First I had to grant CREATE TEMPORARY TABLES permission to my user

CREATE TEMPORARY TABLE email (email VARCHAR(255));
INSERT INTO email VALUES ('[e-mail]'), ('[e-mail]');
SELECT e.email, c.id FROM email e LEFT JOIN client c ON e.email=c.email;

Answer 1

Put the user list into a temporary table and join against that.