Managing Databases with Oracle
Which statement about sequences is not true?

NextVal and CurrVal are both sequence methods.
Sequences guarantee valid surrogate key values.
A sequence is an object that generates a sequential series of unique numbers.
Sequences are most often used to provide values for surrogate keys.

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Managing Databases with Oracle
In creating a procedure, you may get a message if you have compile errors. Which of the following is true?

To see the errors, enter SHOW ERRORS in SQL*Plus.
SQL*Plus will automatically show the errors to you.
If there are no syntax errors, you will receive the message "NO ERRORS."
The line numbers reported match the line numbers you see in your text editor.

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Managing Databases with Oracle
Which of the following is not true about indexes?

Indexes are created to enable fast retrieval by column values.
Indexes are created with the ALTER TABLE command.
Indexes are created to enforce uniqueness on columns.
Columns that are frequently used with equal conditions in WHERE clauses are good candidates for indexes.

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