I have a query that needs the most recent record from a secondary table called
That table holds all the emails sent to clients. And most clients have several to hundreds of emails recorded. I want to pull a query that displays the most recent.
SELECT c.name, c.email, e.datesent FROM `tbl_customers` c LEFT JOIN `tbl_emails_sent` e ON c.customerid = e.customerid
I’m guessing a LEFT JOIN with a subquery would be used, but I don’t delve into subqueries much. Am I going the right direction?
Currently the query above isn’t optimized for specifying the most recent record in the table, so I need a little assistance.
It should be like this, you need to have a separate query to get the maximum date (or the latest date) that the email was sent.
SELECT a.*, b.* FROM tbl_customers a INNER JOIN tbl_emails_sent b ON a.customerid = b.customerid INNER JOIN ( SELECT customerid, MAX(datesent) maxSent FROM tbl_emails_sent GROUP BY customerid ) c ON c.customerid = b.customerid AND c.maxSent = b.datesent
Would this not work?
SELECT t1.datesent,t1.customerid,t2.email,t2.name FROM (SELECT max(datesent) AS datesent,customerid FROM `tbl_emails_sent` ) as t1 INNER JOIN `tbl_customers` as t2 ON t1.customerid=t2.customerid
Only issue you have then is what if two datesents are the same, what is the deciding factor in which one gets picked?