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Setup: create table t3 (c1 number, c2 number); alter table t3 add supplemental log group sl1 (c1, c2) always; alter table t3 add constraint t3_uk unique (c1, c2); insert into t3 values (1, 2); commit; Try to drop the column: SQL> alter table t3 drop column c2; alter table t3 drop column c2 * ERROR at line 1: ORA-12991: ...



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