Comments on: Anyone know what this is?

By: Neil_Shearing

Neil_Shearing — Thu, 08 Nov 2007 11:51:48 +0000

LOL. Hi Alex!

I did wonder if that blog post would bring you out of hiding.

How are things with you?

Neil.

By: alex

alex — Thu, 08 Nov 2007 10:08:49 +0000

“Get me a list of everyone on X mailing list that has not yet received Y email” is the type of problem which this style of query can answer:

SELECT * FROM users LEFT JOIN user_received_email ON ure_usid = us_id WHERE ure_id IS NULL AND ure_emailid = $email_id

We used to use this in an old company as an SQL test for potential new hires. Its a pretty useful one to know.

By: Mike White

Mike White — Wed, 07 Nov 2007 17:01:50 +0000

That’s definitely database talk. It’s part of how you pull the data out of the tables and actually put it together to be used. I recently had some database problems myself because the code was a little messed up. It was a JOIN problem too.