你好，你所说的这个现象下，column1是相同值还是不同值

开启兼容MySQL即可。

alter system set  'compatible_mode' = 4 spfile;
-- 重启生效
drop table if exists tbl_com_unique;
create table tbl_com_unique(c1 int, c2 int, c3 int, constraint uk_c1_c2 unique (c1, c2) );
insert into tbl_com_unique values(1, 1, 0);
insert into tbl_com_unique values(1, 2, 0);
insert into tbl_com_unique values(5, null, 0);
insert into tbl_com_unique values(5, null, 0);
commit;
select * from tbl_com_unique;