Which two operations can be performed on an external table()
ACreate a view on the table.
BCreate an index on the table.
CCreate a synonym on the table.
DAdd a virtual column to the table.
EUpdate the table using the UPDATE statement.
FDelete rows in the table using the DELETE command.
简述S330设备背板总线槽位业务容量。
已知Value是一个类,value是Value的一个对象。下列以非成员函数形式重载的运算符函数原形中,正确的是( )。
A、Value operator+(Value v,int i);
B、Value operator+(Value v=value,int i);
C、Value operator+(Value v ,int i=0);
D、Value operator+(Value v=value,int i=0);
You have two tables with referential integrity enforced between them. You need to insert data to thechild table first because it is going to be a long transaction and data for the parent table will be available ina later stage, which can be inserted as part of the same transaction. View the Exhibit to examine the commands used to create tables. Which action would you take to delay the referential integrity checking until the end of the transaction()
A、 Set the constraint to deferred before starting the transaction.
B、 Alter the constraint to NOVALIDATE state before starting the transaction.
C、 Enable the resumable mode for the session before starting the transaction.
D、 Set the COMMIT_WAIT parameter to FORCE_WAIT for the session before starting the transaction.
Examine the command that is used to create a table: SQL> CREATE TABLE orders(oid NUMBER(6) PRIMARY KEY, odate DATE, ccode NUMBER(6), oamt NUMBER(10,2)) TABLESPACE users; Which two statements are true about the effect of the above command) ()
AA CHECK constraint is created on the OID column.
BA NOT NULL constraint is created on the OID column.
CThe ORDERS table is the only object created in the USERS tablespace.
DThe ORDERS table and a unique index are created in the USERS tablespace.
EThe ORDERS table is created in the USERS tablespace and a unique index is created on the OIDcolumn in the SYSTEM tablespace.
下列的URL中,具有身份验证与加密通讯的网站地址是()。
A、http://wenku.baidu.com
B、http://weibo.com
C、http://www.sina.com.cn
D、https://www.linkedin.com
E、http://www.youku.com