Re: Outer join
Date: Thu, 18 Sep 2008 12:14:44 -0700 (PDT)
On 18 Sep, 20:10, David Portas
> On 18 Sep, 17:26, mje..._at_gmail.com wrote:
> > Hi Dan,
> > Here is another one that does not seem to be working. I'm not sure
> > what I am doing wrong........
> > SELECT DISTINCT(e.customer_id),
> > DECODE(action,'A','Active','D','Inactive') "Status", action_date,
> > MAX(action_date) KEEP (DENSE_RANK LAST ORDER BY action_date)
> > OVER (PARTITION BY e.customer_id) "STUFF"
> > FROM email_product_hist e LEFT OUTER JOIN subscr_email_product s ON
> > e.customer_id = s.customer_id
> > WHERE action_date BETWEEN TO_DATE('06012008','MMDDYYYY') AND
> > TO_DATE('09152008','MMDDYYYY')
> > AND e.email_product_id = 'PPM'
> > ORDER BY e.customer_id DESC, action_date DESC;
> > According to the documentation, the LEFT JOIN should return all rows
> > from email_product_hist and rows from subscr_email_product that do
> > not have matching rows....
> Is action_date in the subscr_email_product table? You didn't include
> an alias so I can't be sure.
> WHERE is evaluated AFTER the outer join so that WHERE condition would
> exclude the NULLs if it refers to the unpreserved ("right") table.
> If I'm right then try changing it like this:
> FROM email_product_hist e
> LEFT OUTER JOIN subscr_email_product s
> ON e.customer_id = s.customer_id
> AND s.action_date BETWEEN TO_DATE('06012008','MMDDYYYY')
> WHERE TO_DATE('09152008','MMDDYYYY')
> AND e.email_product_id = 'PPM'
FROM email_product_hist e
LEFT OUTER JOIN subscr_email_product s
ON e.customer_id = s.customer_id
AND s.action_date BETWEEN
TO_DATE('06012008','MMDDYYYY') AND TO_DATE('09152008','MMDDYYYY') WHERE e.email_product_id = 'PPM'
-- David PortasReceived on Thu Sep 18 2008 - 14:14:44 CDT