Would like the rows with max(date) - mysql

Question

This works in MYSQL:
SELECT hi_Historie_id,
hi_Klus_id,
hi_Datum_gedaan,
hi_Prijs,
hi_Voldaan,
hi_Datum_voldaan,
hi_Voldaan_via,
max(hi_next_date),
hi_Opmerking
FROM Historie
GROUP BY hi_Klus_id
This gives the right Result: all the rows with the hi_Klus_id with the latest date.
But than I will make a join with an other table:
LEFT OUTER JOIN Glazenwassen ON Historie.hi_Klus_id = Glazenwassen.gw_Klus_id
WHERE Historie.hi_next_date <= CURDATE()
This gives the error #1064.
Can anybody explain me why?

Answer 1

My suggestion would be to create a subquery to return the MAX(hi_next_date) and then join that result to both the Historie and Glazenwassen tables:
select h.hi_Historie_id,
h.hi_Klus_id,
h.hi_Datum_gedaan,
h.hi_Prijs,
h.hi_Voldaan,
h.hi_Datum_voldaan,
h.hi_Voldaan_via,
h.hi_next_date,
h.hi_Opmerking
from Historie h
inner join
(
select max(hi_next_date) hi_next_date, hi_Klus_id
from Historie
group by hi_Klus_id
) h2
on h.hi_Klus_id = h2.hi_Klus_id
and h.hi_next_date = h2.hi_next_date
left join Glazenwassen g
on h.hi_Klus_id = g.gw_Klus_id
where h.hi_next_date <= CURDATE()
When you join the subquery to the Historie table, you will want to join on both the hi_next_date and the hi_Klus_id.