071考试是OCP认证的一个重要科目,不少考生都在这里受伤,对此我们专门收集整理了近期071考试的原题,并对071题库进行了讲解,希望帮助大家顺利通过071考试。
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071考试原题分享-第43题、choose the best answer:
Which statement is true about the Oracle SQL, DELETE and TRUNCATE statements?
A) DELETE but not TRUNCATE statement can be used to remove data from selective columns and rows of a table.
B) DELETE and TRUNCATE statements can have a rollback done to restore data into a table.
C) DELETE and TRUNCATE statements remove all indexes for the tables on which they are performed.
D) DELETE but not TRUNCATE statement can be used to selectively remove rows from a table.
Answer:D
(解析:Truncate 是删除整张表的数据,delete 不能删除某个列的数据,删除的是行的数据)
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