Which of the following is not true about modifying table columns?
A. You can drop a column at any time.
B. You can add a column at any time as long as it is a NULL column.
C. You can increase the number of characters in character columns or the number of digits in numeric columns
D. You cannot increase or decrease the number of decimal places.
Answer: Option D
This Question Belongs to Database >> Managing Databases With Oracle
A. Application failure
B. Instance Failure
C. Media Failure
D. Rollback failure
Which statement about sequences is not true?
A. A sequence is an object that generates a sequential series of unique numbers.
B. Sequences are most often used to provide values for surrogate keys.
C. NextVal and CurrVal are both sequence methods.
D. Sequences guarantee valid surrogate key values.
Which prefixes are available to Oracle triggers?
A. :new only
B. :old only
C. Both :new and :old
D. Neither :new nor :old
A. The line numbers reported match the line numbers you see in your text editor.
B. SQL*Plus will automatically show the errors to you.
C. To see the errors, enter SHOW ERRORS in SQL*Plus.
D. If there are no syntax errors, you will receive the message "NO ERRORS."
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