NO. WHERE constraints are applied on the input set (i.e. the rows which evaluate to security() = FALSE are excluded from the aggregation)
HAVING constraints are applied on the output set (which is too late, and with "randomly chosen"* values) * For a non-aggregated and ungrouped field, the value returned will be from a "randomly chosen" record. If there is a single MIN or MAX aggregate, from a "randomly chosen" record whose field value for the MIN or MAX field matches that value. -----Ursprüngliche Nachricht----- Von: Staffan Tylen [mailto:staffan.ty...@gmail.com] Gesendet: Freitag, 19. Dezember 2014 11:28 An: General Discussion of SQLite Database Betreff: Re: [sqlite] Row filtering prior to aggregate function execution Would this work? SELECT SUM(...),COUNT(...), ... FROM ... WHERE ... GROUP BY ... HAVING security(...) ... Staffan On Fri, Dec 19, 2014 at 7:47 AM, Hick Gunter <h...@scigames.at> wrote: > > SELECT ...,sum(...),count() FROM ... WHERE security(...) ... > > With a user defined function security(). > > -----Ursprüngliche Nachricht----- > Von: Roland Martin [mailto:rolandsmar...@gmail.com] > Gesendet: Donnerstag, 18. Dezember 2014 17:09 > An: sqlite-users@sqlite.org > Betreff: [sqlite] Row filtering prior to aggregate function execution > > I have a need to filter the result set before aggregate functions are > performed. For example, a query with a group by clause produces a > result set of 5 rows with count() and sum(). For each of the 5 rows I > need the value of a single column to serve as input into a security > check. If the security checks passes the row is part of the final > result set. If the security check fails the row is discarded and is > not part of the final result set. The final result set in the example > could be 0-5 rows and I would like the result values of count() and sum() to > be accurate. > Unfortunately I cannot query the security system to find out all > valid values and add these values to the where clause. I have to give > a value to the security system and it returns pass or fail. > > > > Based on the above, is there a callback or other mechanism I can use > to participate in the result set generation? > > > > Thanks for the help - Roland Martin > > _______________________________________________ > sqlite-users mailing list > sqlite-users@sqlite.org > http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users > > > ___________________________________________ > Gunter Hick > Software Engineer > Scientific Games International GmbH > FN 157284 a, HG Wien > Klitschgasse 2-4, A-1130 Vienna, Austria > Tel: +43 1 80100 0 > E-Mail: h...@scigames.at > > This communication (including any attachments) is intended for the use > of the intended recipient(s) only and may contain information that is > confidential, privileged or legally protected. Any unauthorized use or > dissemination of this communication is strictly prohibited. If you > have received this communication in error, please immediately notify > the sender by return e-mail message and delete all copies of the > original communication. Thank you for your cooperation. > > > _______________________________________________ > sqlite-users mailing list > sqlite-users@sqlite.org > http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users > _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users ___________________________________________ Gunter Hick Software Engineer Scientific Games International GmbH FN 157284 a, HG Wien Klitschgasse 2-4, A-1130 Vienna, Austria Tel: +43 1 80100 0 E-Mail: h...@scigames.at This communication (including any attachments) is intended for the use of the intended recipient(s) only and may contain information that is confidential, privileged or legally protected. Any unauthorized use or dissemination of this communication is strictly prohibited. If you have received this communication in error, please immediately notify the sender by return e-mail message and delete all copies of the original communication. Thank you for your cooperation. _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
