Question

I have two columns in a table: VisitorID, and URL.

An entry exists in the table for every page view a visitor makes. I’d like to see the total number of visits for each Visitor, where NONE of the URLs in a visitor’s group are LIKE “%page=checkout%”.

I’m thinking it’s something like this:

SELECT *, COUNT(*) AS TotalVisits
FROM `VisitorLog`
GROUP BY VisitorID
HAVING `URL` NOT IN (SELECT * FROM ?? WHERE `URL` LIKE "%page=checkout%")

But I don’t entirely understand how the HAVING clause works with a sub-query, if I need a sub-query at all, etc? And how to make having negative?

And bonus points for anyone who can explain the answer so that I can do it myself next time!

Thanks,

Nick

Answer 1

SELECT *, COUNT(*) AS TotalVisits
FROM `VisitorLog`
WHERE 
    VisitorID NOT IN 
        (SELECT VisitorID FROM `VisitorLog` WHERE `URL` LIKE '%page=checkout%')
GROUP BY VisitorID