单项选择题
A. The statement will be executed successfully， and a new time zone will be set for the database.
B. The statement will be executed successfully， but a new time zone will not be set for the database.
C. The statement will not be executed successfully because the SET TIME_ZONE clause can be used only with the ALTER SESSION statement.
D. The statement will not be executed successfully because the ALTER DATABASE SET TIME_ZONE statement is used only when the database contains no table with the TIMESTAMP TO LOCAL TIME ZONE column.
单项选择题 You are maintaining your database in Oracle10g. You find that the number of languages that should be supported in your database has increased. The character set of your database is UTF8. You decide to migrate your database to the AL16UTF16 national character set. How will you migrate your database from UTF8 to AL16UTF16？（）
单项选择题 Click the Exhibit（s） button to view the EMPLOYEES table. The EMPLOYEE table contains thousands of rows. The EMP_CODE column is the primary key column. At the end of every month， you are required to perform search queries based on the BASIC_SAL+COMM column values. Which type of index will you create？（）
单项选择题 You issued the following command at the UNIX environment： % setenv ORA_SDTZ ’OZ_TZ’ What will be the impact of issuing the above command？（）