如何计算总日期？

Question

I have two tables, and I want to get the last enterd date.

The first table is seeker:

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

The second one is requestblood:

id-------seeker_nic-----requireddate
1-------  111 ----------2012/10/9
2 ------- 222-----------2012/5/8
3 ------  111-----------2012/12/12
4 ------- 111-----------2012/11/12
5---------111-----------2012/09/09
6 ------- 222-----------2012/7/9
7 ------- 333 ----------2012/4/4

i am listing user with last inserted date by this query

SELECT s.username,
(
    SELECT br1.requireddate 
    from bloodrequest as br1 
    where br1.bloodrequest_id = 
    (
        select max(br2.bloodrequest_id)
        from bloodrequest as br2 
        where br2.seeker_nic = s.seeker_nic
    )
) as requireddate
FROM seeker as s

this query works proper and show me data like this.

s.no---- username----- requireddate
 1------- ali---------- 2012/09/09
 2------- umer--------- 2012/7/9
 3------- raza--------- 2012/4/4

now i also want one more fild to show the total no of dates for a specific user .. like this

s.no---- username----- requireddate-----total dates
 1------- ali---------- 2012/09/09-------4
 2------- umer--------- 2012/7/9---------2
 3------- raza--------- 2012/4/4---------1

anyone please tell me how to adjust count in this query.. i shall be thankfull..... plzz need help

Answer 1

Does the following work? Please give a try:

SELECT s.username,
(
    SELECT br1.requireddate
    from bloodrequest as br1 
    where br1.bloodrequest_id = 
    (
        select max(br2.bloodrequest_id)
        from bloodrequest as br2 
        where br2.seeker_nic = s.seeker_nic
    )
) as requireddate,
(
    SELECT count(br3.id)
    from bloodrequest as br3
        where br3.seeker_nic = s.seeker_nic
) as total_dates

FROM seeker as s

Though, it may not be the most efficient one.