I have a need to create a unique bi-directional relationship. You can think of it as pairings of people who eat dinner together.
create table t(i int, j int); insert into t(1,2); insert into t(2,1); << should give an error because the pairing of 1-2 already exists. insert into t(3,2); << OK insert into t(3,1); << OK insert into t(1,3); << should be error You can't guarantee that one column is less than the other so there's no win there. Speed is of the utmost concern here so fast is really important (how many ways can I say that???). Is there anything clever here that can be done with indexes or such? Michael D. Black Senior Scientist NG Information Systems Advanced Analytics Directorate _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
