如何在php中获取最大日期数据

Question

i have three tables..

SEEKER
seeker_nic--- username---request_fulfilled
111-----------ali--------YES
222-----------bilal------YES

second table is

DONOR
donor_nic---username----area
999----------Fahad-------UK
555----------SAJAD------USA
777---------HAMZA-------PK

third table is

STATUS
status-id---seeker_nic---donor_nic--requestfulfilled_by----request_fulfilled_date 
1 -------------111-------999---------- Fahad-------------2012/04/09
2 -------------111-------555---------- SAJAD-------------2012/05/15
3--------------222------777-----------HAMZA--------------2012/07/20

now i want this result for SEEKER (111) with latest data..

seeker_nic---username--- request_fulfilled---requestfulfilled_by----area---request_fulfilled_date
111-----------ali--------YES-----------------SAJAD-----------------USA--------2012/05/15

i am trying this query, this query shows rite seeker_nic, and requestfulfilled_date, but it shows wrong donor-nic, area and requestfulfilled_by...

SELECT seeker.seeker_nic, donor.donor_nic, donor.area, 
status.requestfulfilled_b , max( status.`request_fulfilled_date` ) AS request_fulfilled_date
FROM seeker
JOIN STATUS ON seeker.seeker_nic = status.seeker_nic
JOIN DONOR ON status.donor_nic = donor.donor_nic
WHERE seeker.username = '$uname'
GROUP BY status.`seeker_nic` 

i am getting ans like this....

seeker_nic---username--- request_fulfilled---requestfulfilled_by--------area--------request_fulfilled_date
111-----------ali---------------YES-----------------HAMZA--------------PK------------2012/05/15

plz help me.. :(

Answer 1

Try this:

SELECT seeker.seeker_nic, donor.donor_nic, donor.area, status.requestfulfilled_by, status.request_fulfilled_date
FROM seeker
JOIN (
  SELECT seeker_nic, max(request_fulfilled_date) as last_date
  FROM status
  GROUP BY seeker_nic
) x ON x.seeker_nic = seeker.seeker_nic
JOIN STATUS 
  ON x.seeker_nic = status.seeker_nic
  AND x.last_date = status.request_fulfilled_date
JOIN DONOR 
  ON status.donor_nic = donor.donor_nic
WHERE seeker.username = '$uname'