Hello Even if any one table in a select contains no data,use of outer join will retrieve rows for you.Please note that outer join operator (+) is not allowed in operand of OR or IN.
Regards System. |--------+-----------------------> | | "Gavin | | | D'Mello" | | | <gavin_d@tis.| | | co.in> | | | | | | 05/15/02 | | | 07:33 PM | | | Please | | | respond to | | | ORACLE-L | | | | |--------+-----------------------> >--------------------------------------------------------| | | | To: Multiple recipients of list ORACLE-L | | <[EMAIL PROTECTED]> | | cc: (bcc: systems ho/VGIL) | | Subject: Basic Database Question | >--------------------------------------------------------| Hi I'm just about to ask a really trivial question which has never struck me before. If i write a simple select like select c.contentid from content c, persusercontentassoc p, teachercontentassoc t where t.contentid = c.contentid OR p.contentid = c.contentid; and if the table persusercontentassoc is empty no rows are returned. However, if i populate this table i get meaningful data. So what i'm asking is if any one table in a select contains no data will the select always return no rows ? Thanks, Gavin -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: INET: [EMAIL PROTECTED] Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
