How Can I Find Last Entered Record - mysql

Question

I have two tables: attendees & history. History table is where I post payments for all the attendees. It also stores an historyid and the attendeeid. The query I'm using to try to get to the last record entered in the history table for a particular attendee is:
$stmt = $db->prepare('SELECT a.fname, a.lname, h.amount, h.subsidy, h.last_payment, h.balance
FROM history AS h
INNER JOIN
attendees AS a
ON a.attendeeid = h.attendeeid
WHERE a.attendeeid = :id
ORDER BY historyid DESC LIMIT 1)');
$stmt->bindValue(':id', $id, PDO::PARAM_INT);
$stmt->execute();
$result = $stmt->fetchAll();
But the code is failing to return anything at all. Since there will likely be historyid's greater than the one I'm trying to retrieve, how do I associate the greatest historyid for that attendee so I get the last record entered for them in the History table? What I'm using is obviously not the answer. Thanks in advance for your help.
Sorry. The schemas are:
TABLE attendees (
attendeeid int(10) unsigned NOT NULL AUTO_INCREMENT,
fname varchar(20) NOT NULL,
lname varchar(20) NOT NULL,
dojid varchar(10) NOT NULL,
address1 varchar(25) NOT NULL,
address2 varchar(25) NOT NULL,
city varchar(20) NOT NULL,
state char(2) NOT NULL,
zipcode varchar(5) NOT NULL,
phonenumber varchar(15) NOT NULL,
memberid int(10) unsigned NOT NULL,
PRIMARY KEY (attendeeid),
KEY memberid (memberid),
CONSTRAINT attendees_ibfk_2 FOREIGN KEY (memberid) REFERENCES members (memberid) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
TABLE history (
historyid int(10) unsigned NOT NULL AUTO_INCREMENT,
amount float NOT NULL,
subsidy char(1) NOT NULL,
last_payment date NOT NULL,
amount_paid float NOT NULL,
balance float NOT NULL,
attendeeid int(10) unsigned NOT NULL,
memberid int(10) unsigned NOT NULL,
PRIMARY KEY (historyid),
KEY attendeeid (attendeeid),
CONSTRAINT history_ibfk_2 FOREIGN KEY (attendeeid) REFERENCES attendees (attendeeid) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

Answer 1

Please can you provide the structure of both tables? I'm guessing your tables contains a date columns, or something like that.
Anyway, I would try something like:
select *
from (select a.attendeeid,max(h.id)
FROM history AS h INNER JOIN attendees AS a ON a.attendeeid = h.attendeeid
group by a.attendeeid) as maxHistoryPerAttendee
In that way, you will have the maximun history id per each attendeeid. I'm guessing the max id, is the last inserted row.

Answer 2

This is your query with a couple fields added:
select *
from (select a.attendeeid,max(h.historyid),fname,lname,last_payment,amount
FROM history AS h INNER JOIN attendees AS a ON a.attendeeid = h.attendeeid
group by a.attendeeid) as maxHistoryPerAttendee
where attendeeid = 29
In doing that, I got the first-row entry for that attendee's last_payment instead of the last_payment associated with the MAX(historyid) row.
To add to this and call it done, I got this to work. It's very near my original query.
$stmt = $db->prepare('SELECT fname, lname, amount, subsidy, last_payment, balance, a.attendeeid, h.historyid
FROM history AS h
INNER JOIN attendees AS a ON a.attendeeid = h.attendeeid
where h.attendeeid = :id
ORDER BY h.historyid DESC LIMIT 1');
$stmt->bindValue(':id', $id, PDO::PARAM_INT);
$stmt->execute();
Works like a champ!