Oracle OCP题库解析（8）

ITAA-OCM

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Which statement regarding the dept and emp tables is true?

                               
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A) When you delete a row from the emp table, you would receive a constraint violation error.

B) When you delete a row from the dept table, you would receive a constraint violation error.

C) When you delete a row from the emp table, automatically the corresponding rows are deleted from the dept table.

D) When you delete a row from the dept table, automatically the corresponding rows are deleted from the emp table.

E) When you delete a row from the dept table, automatically the corresponding rows are updated with null values in the emp table.

F) When you delete a row from the emp table, automatically the corresponding rows are updated with null values in the dept table.

Answer: D

ON DELETE CASCADE当主键内容被删除，他所对应的外键内容将自动删除。

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