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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. A data manipulation language statement _____.

A) modifies the data but not the structure of a table
B) modifies the structure but not the data of a table
C) modifies the structure and data in a table
D) completes a transaction on a table

2. In which case would you use a FULL OUTER JOIN?

A) You want all matched data from both tables.
B) You want all matched and unmatched data from only one table.
C) You want all unmatched data from both tables.
D) One of the tables has more data than the other.
E) Both tables have NULL values.
F) You want all unmatched data from one table.

3. Which four statements correctly describe functions that are available in SQL? (Choose four)

A) NVL2 returns the first non-null expression in the expression list.
B) NVL compares two expressions and returns null if they are equal, or the first expression of they are not equal.
C) TRIM trims the heading of trailing characters (or both) from a character string.
D) DECODE translates an expression after comparing it to each search value.
E) NULLIF compares twp expressions and returns null if they are equal, or the first expression if they are not equal.
F) INSTR returns the numeric position of a named character.
G) TRUNCATE rounds the column, expression, or value to n decimal places.

4. Examine these statements:
CREATE ROLE registrar;
GRANT UPDATE ON student_grades TO registrar;
GRANT registrar to user1, user2, user3;
What does this set of SQL statements do?

A) It creates a role called STUDENT_GRADES, adds the UPDATE privilege on three users, and gives the UPDATE role to the registrar.
B) It creates a role called REGISTRAR, adds the UPDATE privilege on the STUDENT_GRADES object to the role, and creates three users with the role.
C) It creates a role called REGISTRAR, adds the MODIFY privilege on the STUDENT_GRADES object to the role, and gives the REGISTRAR role to three users.
D) It creates a role called REGISTRAR, adds the UPDATE privilege on three users, and gives the REGISTRAR role to the STUDENT_GRADES object.
E) The set of statements contains an error and does not work.
F) It creates a role called REGISTRAR, adds the UPDATE privilege on the STUDENT_GRADES object to the role, and gives the REGISTRAR role to three users.

5. What is true of using group functions on columns that contain NULL values?

A) Group functions on columns include NULL values in calculations if you use the keyword INC_NULLS.
B) Group functions on columns returning dates include NULL values.
C) Group functions on columns ignore NULL values.
D) Group functions on columns returning numbers include NULL values.
E) Group functions on columns cannot be accurately used on columns that contain NULL values.

Solutions: