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SQL> ALTER TABLE student252 ADD PRIMARY KEY (sid); Table altered. SQL> ALTER TABLE emp252 ADD PRIMARY KEY (eid); ALTER TABLE emp252 ADD PRIMARY KEY (eid) * [ GIVING AN ERROR AS ONE TABLE CAN HAVE A SINGLE PRIMARY KEY AT COLUMN LAVEL] ERROR at line 1: ORA-02261: such unique or primary key already exists in the table . Example 3 ................
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