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
