Oracle 10.2.0.4 Well, this gives me the right results but I don't understand why... (change the AND to an OR) select tm.month, tm.year, count(*) from img.ton_miles tm where (tm.month != 5 OR tm.year != 2012) group by tm.month, tm.year order by 1,2 Chris Taylor "Quality is never an accident; it is always the result of intelligent effort." -- John Ruskin (English Writer 1819-1900) Any views and/or opinions expressed herein are my own and do not necessarily reflect the views of Ingram Industries, its affiliates, its subsidiaries or its employees. -----Original Message----- From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Taylor, Chris David Sent: Thursday, June 28, 2012 9:35 PM To: 'oracle-l@xxxxxxxxxxxxx' Subject: someone double-check me on this sql I'm a bit fuzzy at the moment due to pain meds after a minor surgery so I'm hoping someone can spot my error (if I have an error) Table has months, years and 'x' number of rows for each The table has Years 2011 and 2012 In 2011, it has months 1-12 And in 2012 it has months 1-5 I run this: Select month, year, count(*) -- month, and year are actual column names From some_table Where (month != 5 and year != 2012) Group by month, year / The data set I get is Months 6-12 for 2011 *ONLY* Shouldn't that query *ONLY* exclude MONTH=5 and YEAR 12 together? (instead of ALL 2012 and ALL 5s?) Chris Taylor "Quality is never an accident; it is always the result of intelligent effort." -- John Ruskin (English Writer 1819-1900) Any views and/or opinions expressed herein are my own and do not necessarily reflect the views of Ingram Industries, its affiliates, its subsidiaries or its employees. -- //www.freelists.org/webpage/oracle-l -- //www.freelists.org/webpage/oracle-l