Question

I’m having trouble with a SQL query, I can’t think how to phrase it.

It’s to pull a count of events from a log since you last checked it.

Currently I have this:

SELECT COUNT(*) AS alertcount, date AS alertdate 
FROM alerts WHERE to_id = '$id' AND date > '$lastcheck'

But, I want it to exclude all fields where expire=1 and the date is over 30 mins old.

So if both of them expressions are true, it will ignore that record in the count.

Answer 1

SELECT COUNT(*) AS alertcount, date AS alertdate 
FROM alerts 
WHERE to_id = '$id' AND (date between '$lastcheck' and getdate() -30 minutes ) and expire!=1

I dont know your DB engine but if is SQL Server, use the dateadd function to calculate the getdate() -30 minutes expression

EDIT:
here is the condition with your new comment. not sure where the to_id will fit in this scenario and also you dont need a date parameter

WHERE ((expire=0) OR (date > getdate() -30 minutes and expire=1) )