Question

i am new in php i have a problem in my php code.please help me..
i have two tables

seeker
seeker_nic-----username
111-------------ali
222-------------umer
333-------------raza

`

requestblood
id-------seeker_nic-----requireddate
1-------  111 ----------2012/9/9
2 ------- 222-----------2012/5/8
3 ------  111-----------2012/10/11
4 ------- 111-----------2012/11/12
5 ------- 222-----------2012/7/9
6 ------- 333 ----------2012/4/4

now i want to list users one time with maximum date like..

s.no---- username----- requireddate
 1------- ali---------- 2012/11/12
 2------- umer--------- 2012/7/9
 3------- raza--------- 2012/4/4

i am using this query

"SELECT  bloodrequest.requireddate, seeker.username
FROM 
bloodrequest
JOIN seeker ON bloodrequest.seeker_nic= seeker.seeker_nic
Join (SELECT max(requireddate)as maxdate FROM bloodrequest) maxresults on
bloodrequest.requireddate = maxresults.maxdate"

..
but it shows only 1 record not the list
and if use this query (left join instead of join)

"SELECT bloodrequest.requireddate, seeker.username
FROM 
bloodrequest
left JOIN seeker ON bloodrequest.seeker_nic = seeker.seeker_nic
left join (SELECT max(requireddate)as maxdate FROM bloodrequest) maxresults
on bloodrequest.requireddate = maxresults.maxdate";

then it shows all records with all dates but not tha maximum..

id------seeker_nic -------requireddate<br>
1 ------ ali   ---------   2012/9/9<br>
2 ------ ali ----------    2012/10/11<br>
3 ------ ali ------------  2012/11/12<br>
4------  umer------------- 2012/5/8<br>
5------- umer -------------2012/7/9<br>
6 ------ raza--------------2012/4/4<br>

Answer 1

You should be able to do this simpler:

select seeker.username, max(requestblood.requireddate)
from seeker
join requestblood on seeker.seeker_nic=requestblood.seeker_nic
group by seeker.username

Feel free to add any sorting order you need.