Mark Brand wrote: > Shouldn't we expect subquery flattening to happen in V2 below? > > -- no flattening > CREATE VIEW V2 AS > SELECT * FROM X > LEFT JOIN ( > SELECT * FROM X > LEFT JOIN Y ON Y.a = X.a > ) Z > ON Z.a = X.a; > > -- manually flattened version of V2 > CREATE VIEW V2_FLATTENED AS > SELECT * > FROM X > LEFT JOIN X X2 > ON X2.a = X.a > LEFT JOIN Y > ON Y.a = X2.a;
In the general case, left outer joins are not associative. Apparently, SQLite does not try to prove the opposite for special cases. Regards, Clemens _______________________________________________ sqlite-users mailing list sqlite-users@mailinglists.sqlite.org http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users
