Choose two.ide
Which two statements are true about the DUAL table?ip
A) It can display multiple rows and columns.it
B) It can be accessed only by the SYS user.table
C) It can be accessed by any user who has the SELECT privilege in any schemaclass
D) It can display multiple rows but only a single column.sed
E) It consists of a single row and single column of VARCHAR2 data type.select
F) It can be used to display only constants or pseudo columns.权限
Answer:ACtab
(解析:dual 这个虚拟的表能够显示多行多列;任何用户均可以访问它。这道题的难点就是对 Answer:C 的理解:在任何模式中拥有 select 权限的用户均可以访问它。di
每一个用户的 select 权限是不须要单独给的,只要是本身的东西,天然就有 select 的权限。)