正解:D
The only SQL*Plus command in this list: DESCRIBE. It cannot be used as SQL command.
This command returns a description of tablename, including all columns in that table, the datatype for each column and an indication of whether the column permits storage of NULL values.
Incorrect answer:
A . INSERT is not a SQL*PLUS command
B . UPDATE is not a SQL*PLUS command
C . SELECT is not a SQL*PLUS command
E . DELETE is not a SQL*PLUS command
F . RENAME is not a SQL*PLUS command
Refer: Introduction to Oracle9i: SQL, Oracle University Study Guide, 7