Re: [sqlite] How to use distinct in group_concat, together with specified separator
Is there any one can help? 2011/1/7 smart sl smar...@gmail.com In Aggregate Functions of SQLite Docs, it's said that: In any aggregate function that takes a single argument, that argument can be preceded by the keyword DISTINCT. Then how about two arguments circumstance when I want to use distinct and together with specified separator. Is there a way to do that? I'm using SQLite 3.7.3 in tcl. Thanks advance. ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] How to use distinct in group_concat, together with specified separator
On 10 January 2011 14:22, smart sl smar...@gmail.com wrote: Is there any one can help? SQLite version 3.6.11 Enter .help for instructions sqlite sqlite create table tst( data integer ); sqlite sqlite insert into tst values( 1 ); sqlite insert into tst values( 2 ); sqlite insert into tst values( 3 ); sqlite insert into tst values( 2 ); sqlite sqlite select group_concat( d, '-' ) from ( select distinct data d from tst ); 1-2-3 sqlite 2011/1/7 smart sl smar...@gmail.com In Aggregate Functions of SQLite Docs, it's said that: In any aggregate function that takes a single argument, that argument can be preceded by the keyword DISTINCT. Then how about two arguments circumstance when I want to use distinct and together with specified separator. Is there a way to do that? I'm using SQLite 3.7.3 in tcl. Thanks advance. Regards, Simon ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] How to use distinct in group_concat, together with specified separator
Thank you. It's an indirect way, and it works. Could it be the same efficient as select group_concat(distinct data separator '-') from tst like in mysql? I'm not quite understand the actual functionality inside, so this is significant to me. 2011/1/10 Simon Davies simon.james.dav...@gmail.com On 10 January 2011 14:22, smart sl smar...@gmail.com wrote: Is there any one can help? SQLite version 3.6.11 Enter .help for instructions sqlite sqlite create table tst( data integer ); sqlite sqlite insert into tst values( 1 ); sqlite insert into tst values( 2 ); sqlite insert into tst values( 3 ); sqlite insert into tst values( 2 ); sqlite sqlite select group_concat( d, '-' ) from ( select distinct data d from tst ); 1-2-3 sqlite 2011/1/7 smart sl smar...@gmail.com In Aggregate Functions of SQLite Docs, it's said that: In any aggregate function that takes a single argument, that argument can be preceded by the keyword DISTINCT. Then how about two arguments circumstance when I want to use distinct and together with specified separator. Is there a way to do that? I'm using SQLite 3.7.3 in tcl. Thanks advance. Regards, Simon ___ 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 use distinct in group_concat, together with specified separator
On 10 January 2011 15:18, smart sl smar...@gmail.com wrote: Thank you. It's an indirect way, and it works. Could it be the same efficient as select group_concat(distinct data separator '-') from tst like in mysql? I'm not quite understand the actual functionality inside, so this is significant to me. I know nothing of the internals of MySql; but although the syntax is different and the SQLite solution looks 'indirect', the processing necessary to generate the result set is basically the same. Regards, Simon ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
