【多选题】
在以下概要文件的陈述中,哪两个是正确的___?
A. 概要文件不能被用来为账户加锁
B. 概要文件不能被用来控制资源使用
C. 数据库管理员可以使用概要文件来使口令衰老和过期
D. 不能删除默认的概要文件
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答案
CD
解析
暂无解析
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在一个新的数据库中,如果要限制一个用户的并行会话(同时连接)数,需要使用以下哪3个步骤?___
A. 使用SESSION_PER_USER参数创建一个角色
B. 使用create profile创建一个概要文件
C. 使用ALTER SYSTEM 语句强制开启资源限制
D. 使用ALTER USER 语句将概要文件赋予用户
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下列有关子查询的说法,正确的是___?
A. 子查询要包含在括号内
B. 不要在子查询中使用order by子句
C. 子查询放在比较条件的右侧
D. 单行子查询是指返回一列数据的子查询语句
【多选题】
在Oracle,可用于提取日期时间类型特定部分(如年、月、日、时、分、秒)的函数有___
A. DATEPART
B. EXTRACT
C. TO_CHAR
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【多选题】
下列查询姓张的学生的语句不正确的是?___
A. select * from 表名 where 姓名 = '%张%'
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D. select * from 表名 where 姓名 = '张'
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关于游标说法正确的是___
A. 是从数据表中提取出来的数据
B. 以临时表的形式存放在内存中
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SQL*Plus的特点包括___。
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PL/SQL下定义package描述正确的是___。
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关于通配符中的"%",以下说法正确的两项是___。
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关于表的主键,说法正确的两项是___。
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以下关于归档日志的说法正确的是___。
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【多选题】
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