Hallo, I have, in DC table, two rows with same data: A_ID I Q 1 370 1 2 370 1
with this query: SELECT FIRST 1 DT.D as DCU, SUM(DC.I) / SUM(DC.Q) AS CU, (SELECT SUM(DC.I) / SUM(Q) FROM DOC_C DC WHERE DC.C > 0.00 AND DC.A_ID = :ID ) AS CM FROM DOC_C DC, DOC_T DT WHERE DC.DOC_T_ID = DT.ID AND DC.C > 0.00 AND DC.A_ID = :ID GROUP BY DT.D ORDER BY DT.D I obtain correct result: CU = 370 CM = 370 but with this query: SELECT FIRST 1 DT.D as DCU, SUM(DC.I / DC.Q) AS CU, (SELECT SUM(DC.I) / SUM(Q) FROM DOC_C DC WHERE DC.C > 0.00 AND DC.A_ID = :ID ) AS CM FROM DOC_C DC, DOC_T DT WHERE DC.DOC_T_ID = DT.ID AND DC.C > 0.00 AND DC.A_ID = :ID GROUP BY DT.D ORDER BY DT.D I obtain wrong result: CU = 740 CM = 370 Why? What is the difference from "SUM(DC.I) / SUM(DC.Q)" and "SUM(DC.I / DC.Q)" Thanks -- Luigi Siciliano -------------------------- ------------------------------------ ------------------------------------ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Visit http://www.firebirdsql.org and click the Documentation item on the main (top) menu. Try FAQ and other links from the left-side menu there. Also search the knowledgebases at http://www.ibphoenix.com/resources/documents/ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------ Yahoo Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/firebird-support/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/firebird-support/join (Yahoo! ID required) <*> To change settings via email: firebird-support-dig...@yahoogroups.com firebird-support-fullfeatu...@yahoogroups.com <*> To unsubscribe from this group, send an email to: firebird-support-unsubscr...@yahoogroups.com <*> Your use of Yahoo Groups is subject to: https://info.yahoo.com/legal/us/yahoo/utos/terms/