Ted Roche wrote: > Yes, there is. http://www.contrib.andrew.cmu.edu/~shadow/sql/sql1992.txt > > There are two uses of DISTINCT in a SQL SELECT statement: > > SELECT DISTINCT <fieldlist>... creates a set of rows with unique > values: no two rows are identical, although individual column values > may be repeated. > > SELECT <fieldlist, including SUM(DISTINCT fieldname)> selects > aggregate operations (like SUM, but the others, too: AVG, STDDEV, etc. > as well as COUNT) on unique values. > > I've only ever used COUNT(DISTINCT myfield) and was curious about what use the others could be.
Anyone think of a situation where SUM(DISTINCT AVG(DISTINCT MIN(DISTINCT MAX(DISTINCT etc might be useful? Peter ---------------------------------------------------------------- Rajan Imports has changed - we are now Whispering Smith Ltd. For more information see our website at www.whisperingsmith.com Please update your address book with my new email address: [email protected] . This communication is intended for the person or organisation to whom it is addressed. The contents are confidential and may be protected in law. Unauthorised use, copying or disclosure of any of it may be unlawful. If you have received this message in error, please notify us immediately by telephone or email. www.whisperingsmith.com Whispering Smith Ltd Head Office:61 Great Ducie Street, Manchester M3 1RR. Tel:0161 831 3700 Fax:0161 831 3715 London Office:17-19 Foley Street, London W1W 6DW Tel:0207 299 7960 _______________________________________________ Post Messages to: [email protected] Subscription Maintenance: http://leafe.com/mailman/listinfo/profox OT-free version of this list: http://leafe.com/mailman/listinfo/profoxtech Searchable Archive: http://leafe.com/archives/search/profox This message: http://leafe.com/archives/byMID/profox/[email protected] ** All postings, unless explicitly stated otherwise, are the opinions of the author, and do not constitute legal or medical advice. This statement is added to the messages for those lawyers who are too stupid to see the obvious.
