You want to implement a master-detail relation between data blocks based on object tables. How would you do this? （） ["Create the relation manually and coordinate the blocks using triggers. ","Base the relation on a REF pointer using the Data Block Wizard. ","Base the relation on a foreign key using the Data Block Wizard. ","This task is not possible because master-detail relations can be implemented only for blocks based on relation tables."]
2002年新成立一企业，其符合一般纳税人条件的企业，应在（）申请办理一般纳税人认定手续。 ["办理税务登记的同时","发生首笔增值税业务时","开业6个月之内","次年1月底前"]
Examine the following command: CREATE TABLE (prod_id number(4), Prod_name varchar2 (20), Category_id number(30), Quantity_on_hand number (3) INVISIBLE); Which three statements are true about using an invisible column in the PRODUCTS table?（） [" The %ROWTYPE attribute declarations in PL\/SQL to access a row will not display the invisible column in the output."," The DESCRIBE commands in SQL *Plus will not display the invisible column in the output."," Referential integrity constraint cannot be set on the invisible column."," The invisible column cannot be made visible and can only be marked as unused."," A primary key constraint can be added on the invisible column."]
地网接地体之间的连接，应采用电焊或气焊连接，不宜采用螺钉连接或铆接；无法使用电焊或氧焊的，建议使用（）焊接。 ["电焊","气焊","氧焊","热熔"]
You wish to enable an audit policy for all database users, except SYS, SYSTEM, and SCOTT.You issue the following statements: SQL> AUDIT POLICY ORA_DATABASE_PARAMETER EXCEPT SYS;SQL> AUDIT POLICY ORA_DATABASE_PARAMETER EXCEPT SYSTEM; SQL> AUDIT POLICY ORA_DATABASE_PARAMETER EXCEPT SCOTT; For which database users is the audit policy now active?（） [" All users except SYS"," All users except SCOTT"," All users except sys and SCOTT"," All users except sys, system, and SCOTT"]
粗糙表面的接触
