Re: [sqlite] newbie question regarding my sqlite code
Am Samstag, 10. Januar 2009 schrieb silvio grosso: > The query is: > select avg(age), avg(durata), sum(età) from acoda, main, dipendenti This is "cross join" over all three tables. The result is a "monster table", consisting of every possible combination of the records of those three tables. And in this "monster table" the sum most probably is correct. Please read your SQL-documention about different types of joins and what they are good for. For debugging purposes you can have a look at select * from acoda, main, dipendenti to see the raw result of your join. ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] newbie question regarding my sqlite code
Try this: select avg(age) from acoda union all select avg(durata) from main union all select sum(età) from dipendenti RBS -Original Message- From: sqlite-users-boun...@sqlite.org [mailto:sqlite-users-boun...@sqlite.org] On Behalf Of silvio grosso Sent: 10 January 2009 10:41 To: sqlite-users@sqlite.org Subject: [sqlite] newbie question regarding my sqlite code Hello, I am a new sqilte user and I am learning sqlite code in my spare time.. I have always used sql code with Microsoft Access and Base (openoffice). Therefore, sorry to ask a question very simple . When I write the very simple code: select sum(età) from dipendenti everything works fine and the result is 100. When I try a bit longer query the result for the sum regarding the column età from the table dipendenti changes and it is wrong. That is 25200? (instead of the right value 100!). The query is: select avg(age), avg(durata), sum(età) from acoda, main, dipendenti In the above query the avg results for the column age (table acoda) and the column durata (table main) are right. The only value wrong is the third, that it, sum (for the table dipendenti, column age, 25200 instead of the right value 100). The column age in the table dipendenti is not present in the other two tables (acoda, main). What's wrong with the second query? Thanks in advance. Best regards ___ 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
[sqlite] newbie question regarding my sqlite code
Hello, I am a new sqilte user and I am learning sqlite code in my spare time.. I have always used sql code with Microsoft Access and Base (openoffice). Therefore, sorry to ask a question very simple . When I write the very simple code: select sum(età) from dipendenti everything works fine and the result is 100. When I try a bit longer query the result for the sum regarding the column età from the table dipendenti changes and it is wrong. That is 25200? (instead of the right value 100!). The query is: select avg(age), avg(durata), sum(età) from acoda, main, dipendenti In the above query the avg results for the column age (table acoda) and the column durata (table main) are right. The only value wrong is the third, that it, sum (for the table dipendenti, column age, 25200 instead of the right value 100). The column age in the table dipendenti is not present in the other two tables (acoda, main). What's wrong with the second query? Thanks in advance. Best regards ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
