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create table t ( a int, b int, c int, d int) ;
 hidden batch(es)


alter table t add unique(b, c);
 hidden batch(es)


insert into t (a, b, c, d) values (1, 1, 1, 1), (2, 2, null, 2), (3, 2, null, null);
3 rows affected
 hidden batch(es)


select * from t;
a b c d
1 1 1 1
2 2 2
3 2
 hidden batch(es)