MaryAnn, the best way to understand rownum is to do the following:
SQL> SELECT ROWNUM, GENDER 2 FROM (SELECT ROWNUM, GENDER 3 FROM EMP2 4 WHERE ROWNUM <= 20) You will quickly see that, no matter how you order the result set, the first record returned is rownum #1, second is rownum #2 etc. The rownum value is assigned as rows are RETURNED or DISPLAYED, not as they are selected. when you run your original query: SQL> SELECT ROWNUM, GENDER 2 FROM (SELECT ROWNUM, GENDER 3 FROM EMP2 4 WHERE ROWNUM <= 20) 5 WHERE ROWNUM > 10; you should *not* get any rows because the first row returned has a value of 1 - hece you get nothing. the next row returned gets the value of 1 - again, nothing gets shown. just what is it you want to return in your query? Tom Mercadante Oracle Certified Professional -----Original Message----- Sent: Wednesday, July 09, 2003 12:19 PM To: Multiple recipients of list ORACLE-L results I definitely dont fully understand ROWNUM yet, and you guys so far provided more info than a couple of books by Oracle, that I have here. For a second I thought I'm beginning to get it, but the queries suggested produced no results... SQL> SELECT ROWNUM, GENDER 2 FROM (SELECT ROWNUM, GENDER 3 FROM EMP2 4 WHERE ROWNUM <= 20) 5 WHERE ROWNUM > 10; no rows selected SQL> SELECT r, GENDER 2 FROM (SELECT ROWNUM r, GENDER 3 FROM EMP2 4 WHERE ROWNUM <= 20) 5 WHERE ROWNUM > 10; no rows selected SQL> SELECT r "ROWNUM", GENDER 2 FROM (SELECT ROWNUM r, GENDER 3 FROM EMP2 4 WHERE ROWNUM <= 20) 5 WHERE ROWNUM > 10; no rows selected SQL> ... so, any help is appreciated - rownum is driving me nuts... thx maa __________________________________ Do you Yahoo!? SBC Yahoo! DSL - Now only $29.95 per month! http://sbc.yahoo.com -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: MaryAnn Atkinson INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- 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). -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Mercadante, Thomas F INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- 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).
