Inline query issue

Question

Hi,
I'm creating a report which will dislplay all purchase orders pending for approval :
iI've a table po_headers_all will give all purchase orders
I've another table called po approival history from that table I need to check whether particular purchase is approved or not if it is not approved I need to pull most recent user as approver
po_orders table is like this :
po number   creation date header id   
1111            12/31/2012     234   .....History table is like this
Seq  po number  creation date             action        approver
1       1111          01/01/2013  12:00    submit        abc
2       1111          01/01/2013  1:30      forward      abc
3       1111           01/10/2013  12:50    in process   bcd
4       1111           01/12/2013    1:30     approve     gcf
5       1111           01/13/2013    2:30     approve     hcfwhile pulling the purchase order details from po_headers table I need to joiin these table and get
the most recent approver i.e for action=approve
I'm expecting result like this :
po number header id  approver
1111          234          hcfBut I'm getting more than one record with the following query :
select a.po_number,
         a.header_id,
        b.action,
       b.approver
from po_headers_all a
(select max(seq_num),approver from po_history
group by approver
having action='approve') b
where a.po_header_id = b.po_header_id

Answer 1

user518071 wrote:
po_orders table is like this :
po number   creation date header id   
1111            12/31/2012     234   .....History table is like this
Seq  po number  creation date             action        approver
1       1111          01/01/2013  12:00    submit        abc
2       1111          01/01/2013  1:30      forward      abc
3       1111           01/10/2013  12:50    in process   bcd
4       1111           01/12/2013    1:30     approve     gcf
5       1111           01/13/2013    2:30     approve     hcfI'm expecting result like this :
po number header id  approver
1111          234          hcfBut I'm getting more than one record with the following query :
select a.po_number,
a.header_id,
b.action,
b.approver
from po_headers_all a
(select max(seq_num),approver from po_history
group by approver
having action='approve') b
where a.po_header_id = b.po_header_id
couple of questions:
1) Firstly your data does not seems to be correct, because you are joining using po_header_id in history table which does not exist in the data you provided.
2) Secondly your query will not work as there is comma missing.
Help us to help you :)
Cheers,
Manik.