Kali Linux是基于Debian的Linux发行版， 设计用于数字取证操作系统。由Offensive Security Ltd维护和资助。最先由Offensive Security的Mati Aharoni和Devon Kearns通过重写BackTrack来完成，BackTrack是他们之前写的 ...

Which two statements are true about the SET VERIFY ON command? A) It displays values for variables created by the DEFINE command. B) It can be used in SQL Developer and SQL*Plus. C) It can be used onl ...

In which three situations does a new transaction always start? A) When issuing a SELECT FOR UPDATE statement after a CREATE TABLE AS SELECT statement was issued in the same session B) When issuing a C ...

Which two statements are true about substitution variables? A) A substitution variable used to prompt for a column name must be endorsed in single quotation marks. B) A substitution variable used to p ...

Which statements are true regarding primary and foreign key constraints and the effect they can have on table data? A) A table can have only one primary key but multiple foreign keys. B) It is possibl ...

1、with admin option 用于系统权限授权，with grant option 用于对象授权。 2、给一个用户授予系统权限带上with admin option 时，此用户可把此系统权限授予其他用户或角色，但收回这个用户的系统权限时，这个用户 ...

Examine this business rule: Each student can work on multiple projects and each project can have multiple students. You must design an Entity Relationship(ER) model for optimal data storage and allow ...

Which two are true about the MERGE statement? A) The WHEN NOT MATCHED clause can be used to specify the deletions to be performed. B) The WHEN NOT MATCHED clause can be used to specify the inserts to ...