Re: [sqlite] how to divide a database?
on lower half.. attach database 'yourdbname' as full; insert into table1 select * from full.table1 where col1 < 'your mid point value'; on upper half attach database 'yourdbname' as full; insert into table1 select * from full.table1 where col1 >= 'your mid point value'; You'll need a unique index or primary key on the tables.. In the above col1 is your unique column or primary key HTH --- On Fri, 3/13/09, baxy77bax <b...@hi.htnet.hr> wrote: > From: baxy77bax <b...@hi.htnet.hr> > Subject: Re: [sqlite] how to divide a database? > To: sqlite-users@sqlite.org > Date: Friday, March 13, 2009, 3:21 AM > ok, > and how to construct a query that says; select data from > table until row > number = 'middle point or so...'. > > or > > generally how to say; select 30 rows then transfer it into > new table , then > select next 30 rows and do the same... and so on until you > reach the end > > iteration is not such a problem but the problem is ::: > > > how to say: select 30 rows -> this is the actual > question ! > > thnx > > > > > ken-33 wrote: > > > > > > You'll need to know something about your data. > You'll need the > > midpoint of each table so or at least something close. > > > > Then create two db's attach the original. And > insert the data using a > > select statement with a where clause. > > > > > > > > --- On Thu, 3/12/09, baxy77bax > <b...@hi.htnet.hr> wrote: > > > >> From: baxy77bax <b...@hi.htnet.hr> > >> Subject: Re: [sqlite] how to divide a database? > >> To: sqlite-users@sqlite.org > >> Date: Thursday, March 12, 2009, 4:13 PM > >> ok, i have one database with two tables and i want > to create > >> two databases , > >> each with two tables in which contain half of the > initial > >> data > >> > >> input: > >> > >> db > >> table1 table2 > >> 11 > >> 22 > >> 33 > >> 44 > >> > >> > >> result: > >> > >> db1 db2 > >> table1 table2table1table2 > >> 11 33 > >> 22 44 > >> > >> > >> Jim Dodgen wrote: > >> > > >> > I am confused also. > >> > > >> > Are you wanting to put half the rows from > each table > >> in each database? > >> > > >> > On Thu, Mar 12, 2009 at 2:01 PM, baxy77bax > >> <b...@hi.htnet.hr> wrote: > >> >> > >> >> hi, > >> >> let say that i have one db with 2 tables > in it. > >> and now i wish to divide > >> >> that database in 2 equal (half size of > the > >> original) databases. two > >> >> tables > >> >> in initial database have one column. how > would i > >> do that ?:confused: > >> >> any suggestions > >> >> > >> >> thank you > >> >> -- > >> >> View this message in context: > >> >> > >> > http://www.nabble.com/how-to-divide-a-database--tp22485238p22485238.html > >> >> Sent from the SQLite mailing list archive > at > >> Nabble.com. > >> >> > >> >> > ___ > >> >> sqlite-users mailing list > >> >> sqlite-users@sqlite.org > >> >> > >> > http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users > >> >> > >> > > >> > > >> > > >> > -- > >> > Jim Dodgen > >> > j...@dodgen.us > >> > > ___ > >> > sqlite-users mailing list > >> > sqlite-users@sqlite.org > >> > > >> > http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users > >> > > >> > > >> > >> -- > >> View this message in context: > >> > http://www.nabble.com/how-to-divide-a-database--tp22485238p22485445.html > >> Sent from the SQLite mailing list archive at > Nabble.com. > >> > >> ___ > >> 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 > > > > > > -- > View this message in context: > http://www.nabble.com/how-to-divide-a-database--tp22485238p22492011.html > Sent from the SQLite mailing list archive at Nabble.com. > > ___ > 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
Re: [sqlite] how to divide a database?
ok, and how to construct a query that says; select data from table until row number = 'middle point or so...'. or generally how to say; select 30 rows then transfer it into new table , then select next 30 rows and do the same... and so on until you reach the end iteration is not such a problem but the problem is ::: how to say: select 30 rows -> this is the actual question ! thnx ken-33 wrote: > > > You'll need to know something about your data. You'll need the > midpoint of each table so or at least something close. > > Then create two db's attach the original. And insert the data using a > select statement with a where clause. > > > > --- On Thu, 3/12/09, baxy77bax <b...@hi.htnet.hr> wrote: > >> From: baxy77bax <b...@hi.htnet.hr> >> Subject: Re: [sqlite] how to divide a database? >> To: sqlite-users@sqlite.org >> Date: Thursday, March 12, 2009, 4:13 PM >> ok, i have one database with two tables and i want to create >> two databases , >> each with two tables in which contain half of the initial >> data >> >> input: >> >> db >> table1 table2 >> 11 >> 22 >> 33 >> 44 >> >> >> result: >> >> db1 db2 >> table1 table2table1table2 >> 11 33 >> 22 44 >> >> >> Jim Dodgen wrote: >> > >> > I am confused also. >> > >> > Are you wanting to put half the rows from each table >> in each database? >> > >> > On Thu, Mar 12, 2009 at 2:01 PM, baxy77bax >> <b...@hi.htnet.hr> wrote: >> >> >> >> hi, >> >> let say that i have one db with 2 tables in it. >> and now i wish to divide >> >> that database in 2 equal (half size of the >> original) databases. two >> >> tables >> >> in initial database have one column. how would i >> do that ?:confused: >> >> any suggestions >> >> >> >> thank you >> >> -- >> >> View this message in context: >> >> >> http://www.nabble.com/how-to-divide-a-database--tp22485238p22485238.html >> >> Sent from the SQLite mailing list archive at >> Nabble.com. >> >> >> >> ___ >> >> sqlite-users mailing list >> >> sqlite-users@sqlite.org >> >> >> http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users >> >> >> > >> > >> > >> > -- >> > Jim Dodgen >> > j...@dodgen.us >> > ___ >> > sqlite-users mailing list >> > sqlite-users@sqlite.org >> > >> http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users >> > >> > >> >> -- >> View this message in context: >> http://www.nabble.com/how-to-divide-a-database--tp22485238p22485445.html >> Sent from the SQLite mailing list archive at Nabble.com. >> >> ___ >> 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 > > -- View this message in context: http://www.nabble.com/how-to-divide-a-database--tp22485238p22492011.html Sent from the SQLite mailing list archive at Nabble.com. ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] how to divide a database?
You'll need to know something about your data. You'll need the midpoint of each table so or at least something close. Then create two db's attach the original. And insert the data using a select statement with a where clause. --- On Thu, 3/12/09, baxy77bax <b...@hi.htnet.hr> wrote: > From: baxy77bax <b...@hi.htnet.hr> > Subject: Re: [sqlite] how to divide a database? > To: sqlite-users@sqlite.org > Date: Thursday, March 12, 2009, 4:13 PM > ok, i have one database with two tables and i want to create > two databases , > each with two tables in which contain half of the initial > data > > input: > > db > table1 table2 > 11 > 22 > 33 > 44 > > > result: > > db1 db2 > table1 table2table1table2 > 11 33 > 22 44 > > > Jim Dodgen wrote: > > > > I am confused also. > > > > Are you wanting to put half the rows from each table > in each database? > > > > On Thu, Mar 12, 2009 at 2:01 PM, baxy77bax > <b...@hi.htnet.hr> wrote: > >> > >> hi, > >> let say that i have one db with 2 tables in it. > and now i wish to divide > >> that database in 2 equal (half size of the > original) databases. two > >> tables > >> in initial database have one column. how would i > do that ?:confused: > >> any suggestions > >> > >> thank you > >> -- > >> View this message in context: > >> > http://www.nabble.com/how-to-divide-a-database--tp22485238p22485238.html > >> Sent from the SQLite mailing list archive at > Nabble.com. > >> > >> ___ > >> sqlite-users mailing list > >> sqlite-users@sqlite.org > >> > http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users > >> > > > > > > > > -- > > Jim Dodgen > > j...@dodgen.us > > ___ > > sqlite-users mailing list > > sqlite-users@sqlite.org > > > http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users > > > > > > -- > View this message in context: > http://www.nabble.com/how-to-divide-a-database--tp22485238p22485445.html > Sent from the SQLite mailing list archive at Nabble.com. > > ___ > 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
