我创建了一个包含列S_ROLL NUMBER(3)NOT NULL的表现在我想将此列作为标识列.
我用过这个命令
我用过这个命令
- alter table students
- modify
- (
- S_ROLL NUMBER GENERATED BY DEFAULT ON NULL AS IDENTITY
- );
然后我收到了这个错误.
- S_ROLL NUMBER GENERATED BY DEFAULT ON NULL AS IDENTITY
- *
- ERROR at line 4:
- ORA-30673: column to be modified is not an identity column
