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

From: Suri, Deepak <DSuri_at_oxhp.com>
Date: Wed, 15 Nov 2000 18:52:27 -0500
Message-Id: <10681.122204@fatcity.com>

If I understand you correctly, then you could use an outer join, in which case your query should look like...

	SELECT
		hp.URL,
		count(nvl(pv.HTML_PAGE_ID,0))
	FROM
		PAGE_VIEWS pv, HTMP_PAGE hp
	WHERE 
		hp.PAGE_ID = pv.HTML_PAGE_ID (+)
	AND
		pv.VIEW_DATE > addmonths(SYSDATE, -1);

Note the nvl(...) and (+) operator

deepak

-----Original Message-----
From: Dave Morgan [mailto:dmorgan_at_bartertrust.com] Sent: Wednesday, November 15, 2000 10:30 AM To: Multiple recipients of list ORACLE-L Subject: count(*) = 0 and I still need the row

Hi All,

	For the SQL experts out there. 
	I have the tables

	PAGE_VIEWS
		VIEW_ID		NUMBER(10,0)
		HTML_PAGE_ID	NUMBER(10,0)
		VIEW_DATE	DATE

	HTML_PAGE
		PAGE_ID		NUMBER(10,0)
		URL		VARCHAR2(255)
		....

	PAGE_VIEWS.HTML_PAGE_ID is a foreign key to HTML_PAGE.PAGE_ID
	I want to get a list of all pages and number of times they are
viewed
	in the past month. 

	SELECT
		hp.URL,
		count(pv.HTML_PAGE_ID)
	FROM
		PAGE_VIEWS pv, HTMP_PAGE hp
	WHERE 
		hp.PAGE_ID = pv.HTML_PAGE_ID
	AND
		pv.VIEW_DATE > addmonths(SYSDATE, -1);

	This works fine except when the page has not been viewed in which
	case it does not show up in the report. I would like it to show up
	with the number 0. Any ideas?

	This is in a stored procedure so I can be very flexible.

TIA
Dave
--

Dave Morgan
Senior Database Administrator
Internet Barter Inc.
www.bartertrust.com
408-982-8774
--

Please see the official ORACLE-L FAQ: http://www.orafaq.com
--

Author: Dave Morgan
  INET: dmorgan_at_bartertrust.com

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