Hello,
Not specific to sqlite, but a rather generic SQL question...
Given a set of ids, what would be the proper way to find the records
containing all those ids?
Specifically, given a 'document_token' table containing a document_id
mapping to multiple token_id, how would one find the document_id which
contains all the given token_id?
E.g.:
create table if not exists document_token
(
document_id integer not null,
token_id integer not null
);
insert into document_token( 1, 11 );
insert into document_token( 1, 12 );
insert into document_token( 2, 11 );
insert into document_token( 2, 12 );
insert into document_token( 3, 11 );
create temporary table if not exists stage
(
id integer not null,
);
insert into stage( 11 );
insert into stage( 12 );
Given an input of 11 and 12 as token_id in the 'stage' table, what
would be the proper query to retrieve document_id 1 and 2 (but not 3
as it only contains token_id 11)?
Simply joining the two tables will result in all the document_id being
returned:
select distinct
document_id
from stage
join document_token on document_token.token_id = stage.id
Thoughts?
Thanks in advance.
Kind regards,
--
PA.
http://alt.textdrive.com/nanoki/
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