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create table t (id int not null primary key, val1 int, val2 int); create unique index t_ux_vals on t (val1, val2); insert into t (val1, val2) values (0, 0); insert into t (val1, val2) values (0, null); insert into t (val1, val2) values (null, 0); insert into t (val1, val2) values (null, null); insert into t (val1, val2) values (0, 0); insert into t (val1, val2) values (0, null); insert into t (val1, val2) values (null, 0); insert into t (val1, val2) values (null, null);

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