Getting max date from a joined table with group by - mysql

Question

I've got 3 tables - entryrecord, employee and employee_entryrecord (linking table).
The query I'd like is for it to return the most recent (max time) inout record for each employee.
employee
id employee
1 John
2 Tom
entryrecord
id created_date inout
1 2016-07-22 16:01:38 1
2 2016-07-22 16:03:22 1
3 2016-07-22 16:05:22 2
4 2016-07-22 16:07:22 2
5 2016-07-22 16:09:22 1
I'd like the follow output
created_date employee inout entryrecordid
2016-07-22 16:09:22 John 1 5
2016-07-22 16:05:22 Tom 2 3
However, in the sqlfiddle below you can see it does not return the correct inout and entryrecordid values.
I've created a sqlfiddle to view what I've done.
SQL Fiddle
Any help would be great.
Thanks.

Answer 1

Please give it a try:
SELECT
finalALias.created_date,
E.employee,
finalALias.inout,
finalALias.id AS entryrecordid
FROM employee E
INNER JOIN
(
SELECT
*
FROM entryrecord entryR
INNER JOIN
(
SELECT
EER.employeeid,
MAX(created_date) max_time
FROM entryrecord ER
INNER JOIN employee_entryrecord EER ON ER.id = EER.entryrecordid
GROUP BY EER.employeeid
) t
ON t.max_time=entryR.created_date
) AS finalALias
ON E.id = finalALias.employeeid
ORDER BY finalALias.created_date DESC;
WORKING DEMO
Just a gentle reminder:
E -> employee
ER -> entryrecord
ERR -> employee_entryrecord

Answer 2

The problem is that grouping happens before ordering. You will have to do a sub query. You always want to try and keep your sub queries to a minimum as they put a heavy toll on the SQL server.
I changed your LEFT JOINS to INNER JOINS because it looked like you wanted to only get employees that were in the other tables.
SELECT
entryrecord.created_date,
employee.employee,
entryrecord.inout,
entryrecord.id
FROM
entryrecord
INNER JOIN
employee_entryrecord ON entryrecord.id = employee_entryrecord.entryrecordid
INNER JOIN
employee ON employee_entryrecord.employeeid = employee.id
WHERE
entryrecord.inout in (1,2)
AND entryrecord.id = (
SELECT er2.id
FROM employee_entryrecord eer2, entryrecord er2
WHERE eer2.employeeid = employee.id
AND er2.id = eer2.entryrecordid
ORDER BY er2.created_date DESC LIMIT 1
)