单项选择题

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;

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单项选择题

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.

单项选择题

What does the TRUNCATE statement do?（）

A. Removes the table
B. Removes all rows from a table
C. Shortens the table to 10 rows
D. Removes all columns from a table
E. Removes foreign keys from a table

单项选择题

Which is an /SQL*Plus command?（）

A. INSERT
B. UPDATE
C. SELECT
D. DESCRIBE
E. DELETE
F. RENAME