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非过程性DML
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View the Exhibit for some of the parameter settings. You start a session and issue the following command:SQLCREATE INDEX emp_ename ON emp(ename) TABLESPACE users INVISIBLE;What is the outcome of the above command?（）A. The index is not used by the optimizer but is maintained during DML operations.B. The index is not used by the optimizer and is not maintained during DML operations.C. The index is used by the optimizer only if a hint is specified in the query statement and is maintained during DML operations.D. The index is used by the optimizer only if a hint is specified in the query statement but is not maintained during DML operations.
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关于关系演算语言，下列说法中正确的是(67)。①查询操作是以集合操作为基础运算的DML语言②查询操作是以谓词演算为基础运算的DML语言③关系演算语言的基础是数理逻辑中的谓词演算④关系演算语言是一种过程性语言A．②B．②③C．②③④D．全部
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下列有关对视图执行DML操作的表述中哪个是正确的？（）A、可以对简单视图执行DML操作。B、不能对包含WITH CHECK OPTION子句的视图执行DML操作。C、可以对包含WITH READ ONLY选项的视图执行DML操作。D、可以对包含由表达式（如COST+1）定义的列的视图执行DML操作。
考题
You have altered a non-unique index to be invisible to determine if queries execute within an acceptable response time without using this index. Which two are possible if table updates are performed which affect the invisible index columns?（）A、The index remains invisible.B、The index is not updated by the DML statements on the indexed table.C、The index automatically becomes visible in order to have it updated by DML on the table.D、The index becomes unusable but the table is updated by the DML.E、The index is updated by the DML on the table.
考题
多选题You have altered a non-unique index to be invisible to determine if queries execute within an acceptable response time without using this index. Which two are possible if table updates are performed which affect the invisible index columns?（）AThe index remains invisible.BThe index is not updated by the DML statements on the indexed table.CThe index automatically becomes visible in order to have it updated by DML on the table.DThe index becomes unusable but the table is updated by the DML.EThe index is updated by the DML on the table.
考题
名词解释题非过程性DML
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