Lucas Cotta <lucco...@gmail.com> wrote: > Are primary keys and foreign keys indexes by default? Or do we have to set > them as indexes?
An index is automatically created to implement PRIMARY KEY and UNIQUE constraints. No indexes are automatically created for foreign key constraints. Columns mentioned in REFERENCES clause must already have a unique index of them (whether explicitly or implicitly as a result of PRIMARY KEY or UNIQUE constraints). Indexes (not necessarily unique) on the columns of the child table subject to FOREIGN KEY constrained are recommended, but not required. For details, see http://sqlite.org/foreignkeys.html#fk_indexes -- Igor Tandetnik _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
