Oracle
1Z0-061 · Question #130
1Z0-061 Question #130: Real Exam Question with Answer & Explanation
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Question
You created an ORDERS table with the following description: You inserted some rows in the table. After some time, you want to alter the table by creating the PRIMARY KEY constraint on the ORD_ID column. Which statement is true in this scenario?
Exhibit
Options
- AYou cannot add a primary key constraint if data exists in the column
- BYou can add the primary key constraint even if data exists, provided that there are no duplicate
- CThe primary key constraint can be created only a the time of table creation
- DYou cannot have two constraints on one column
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