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create table t (id1 int, id2 int); create unique index t_ux_id1_id2 on t (id1, id2); insert into t (id1, id2) values (1,1); insert into t (id1, id2) values (1,null); insert into t (id1, id2) values (null,1); insert into t (id1, id2) values (null,null); select * from t; insert into t (id1, id2) values (null,null); select * from t; insert into t (id1, id2) values (1,null); select * from t; insert into t (id1, id2) values (null,1); select * from t;

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