outer join while selecting the date max
HelloOracle 11g R2.
I want to build a query that joins outside between 2 related tables, but selects only the date max if more than 1 record returned for a given customer. Here are the tables I and some records.
create table customer (NumCli number, name varchar2 (100))
create table orders (ordnum number, NumCli number, date orddate)
insert into customers values (1, 'ABC')
insert into customer values (2, 'DEF')
insert into customer values (3, 'ABC')
insert into customer values (4, 'DEF')
insert into orders values (1, 1, sysdate)
insert into orders values (2, 1, sysdate + 1)
insert into orders values (3, 2, sysdate + 2)
I created the following query, but it returns the two dates for NumCli = 1. I want to display the name of the client no matter if he has a prescription. But if there is more order, I want display the folder with the date max.
Select a.custnum, b.SID, b.orddate
client a, b of orders
where a.custnum = b.custnum (+)
and b.orddate (+) < = sysdate + 10 - additional criteria as part of the edition
It is a simplified example of a more complex query, that I am trying to solve. If possible, could you please suggestion a request without the use of analytical functions or inline views?
Thank you!!
Published by: arizona9952 on April 4, 2013 22:05
arizona9952 wrote:
Thanks Jac. Any way to do this without a group of?
Is there a particular reason not to use MAX?
It will be difficult to find a maximum date without a group of... If it's ok for you to have everything available, you can use the correlated sub query...
select a.custnum, a.name,
(
select b.orddate
from orders b
where b.custnum = a.custnum
and b.orddate <= sysdate + 10
and rownum = 1 ) ordddate
from customer a
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If my answer or the answer to another person has been useful or appropriate, please mark accordingly
Published by: Manu. April 27, 2010 15:19
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