單項選擇題

Exhibit

Examine the data in the EMPLOYEES and DEPARTMENTS tables.
You want to retrieve all employees' last names, along with their manager's last names and their department names. Which query would you use?（）

A. SELECT last_name, manager_id, department_name FROM employees e FULL OUTER JOIN department d ON (e.department_id = d.department_id);
B. SELECT e.last_name, m.last_name, department_name FROM employees e LEFT OUTER JOIN employees m on ( e.managaer_id = m.employee_id) LEFT OUTER JOIN department d ON (e.department_id = d.department_id);
C. SELECT e.last_name, m.last_name, department_name FROM employees e RIGT OUTER JOIN employees m on ( e.manager_id = m.employee_id) FULL OUTER JOIN department d ON (e.department_id = d.department_id);
D. SELECT e.last_name, m.last_name, department_name FROM employees e LEFT OUTER JOIN employees m on ( e.manager_id = m.employee_id) RIGT OUTER JOIN department d ON (e.department_id = d.department_id);
E. SELECT e.last_name, m.last_name, department_name FROM employees e RIGHT OUTER JOIN employees m on ( e.manager_id = m.employee_id) RIGHT OUTER JOIN departments d ON (e.department_id = d.department_id)
F. SELECT last_name, manager_id, department_name FROM employees e JOIN department d ON (e.department_id = d.department_id);

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單項選擇題

Which statement creates a new user?（）

A. CREATE USER susan;
B. CREATE OR REPLACE USER susan;
C. CREATE NEW USER susan    DEFAULT;
D. CREATE USER susan    IDENTIFIED BY blue;
E. CREATE NEW USER susan   IDENTIFIED by blue;
F. CREATE OR REPLACE USER susan   IDENTIFIED BY blue;

單項選擇題

You need to change the definition of an existing table. The COMMERCIALS table needs its DESCRIPTION column changed to hold varying length characters up to 2000 bytes. The column can currently hold 1000 bytes per value. The table contains 20000 rows.
Which statement is valid?（）

A. ALTER TABLE commercials   MODIFY (description CHAR2(2000));
B. ALTER TABLE commercials   CHANGE (description CHAR2(2000));
C. ALTER TABLE commercials   CHANGE (description VARCHAR2(2000));
D. ALTER TABLE commercials   MODIFY (description VARCHAR2(2000));
E. You cannot increase the size of a column if the table has rows.

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Exhibit Examine the data in the EMPLOYEES and DEPARTMENTS tables. You want to retrieve all employees' last names, along with their manager's last names and their department names. Which query would you use?（）

你可能感興趣的試題

Which statement creates a new user?（）

You need to change the definition of an existing table. The COMMERCIALS table needs its DESCRIPTION column changed to hold varying length characters up to 2000 bytes. The column can currently hold 1000 bytes per value. The table contains 20000 rows. Which statement is valid?（）

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Exhibit

Examine the data in the EMPLOYEES and DEPARTMENTS tables.
You want to retrieve all employees' last names, along with their manager's last names and their department names. Which query would you use?（）

You need to change the definition of an existing table. The COMMERCIALS table needs its DESCRIPTION column changed to hold varying length characters up to 2000 bytes. The column can currently hold 1000 bytes per value. The table contains 20000 rows.
Which statement is valid?（）