Oracle FAQ Your Portal to the Oracle Knowledge Grid
HOME | ASK QUESTION | ADD INFO | SEARCH | E-MAIL US
 

Home -> Community -> Mailing Lists -> Oracle-L -> count(*) = 0 and I still need the row

count(*) = 0 and I still need the row

From: Dave Morgan <dmorgan_at_bartertrust.com>
Date: Thu, 16 Nov 2000 12:05:09 -0800
Message-Id: <10682.122285@fatcity.com>


Hi All,

	Thanks to Javier, Ron, William and Deepak for their efforts
	I have not tried Ron's solution of pre-setting the variable 
	yet, thats next.

I have tried outer joins:
        SELECT
                hp.URL,
		nvl(count(pv.HTML_PAGE_ID),0)
        FROM PAGE_VIEWS pv, HTMP_PAGE hp
        WHERE hp.PAGE_ID = pv.HTML_PAGE_ID(+)
	GROUP BY hp.URL

Returns 
	The HideAway    	       1
	The Townsend                   0
	Tony's Place                   0	
	Yet Another                    0
	available                      0
	creepy condo's                 2
	slumpers                       3
	twomonthsago                   2

Add in the date restriction:
        SELECT 
		hp.URL,
		nvl(count(pv.HTML_PAGE_ID),0)
        FROM PAGE_VIEWS pv, HTMP_PAGE hp
        WHERE hp.PAGE_ID = pv.HTML_PAGE_ID (+)
        AND pv.VIEW_DATE > add_months(SYSDATE, -1);
	GROUP BY hp.URL

Returns 
	The HideAway    	       1
	creepy condo's                 2
	slumpers                       3

And people believe I know what I'm doing????

It does process the row "twomonthsago" semi-properly as those pageviews are more than 1 month ago. (Yes the data was created to be meaningful) I say semi-properly because it should display

	twomonthsago                   0
 

Anyone know why the the date test alters the outer join results?

TIA
Dave

-- 
Dave Morgan
Senior Database Administrator
Internet Barter Inc.
Received on Thu Nov 16 2000 - 14:05:09 CST

Original text of this message

HOME | ASK QUESTION | ADD INFO | SEARCH | E-MAIL US