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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. Which is an iSQL*Plus command?

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

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

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

3. Examine the structure of the EMPLOYEES, DEPARTMENTS, and TAX tables.

For which situation would you use a nonequijoin query?

A) To find the name, salary, and department name of employees who are not working with Smith.
B) To find the number of employees working for the Administrative department and earning less then 4000.
C) To display name, salary, manager ID, and department name of all the employees, even if the employees do not have a department ID assigned.
D) To list the name, job id, and manager name for all the employees.
E) To find the tax percentage for each of the employees.

4. Which operator can be used with a multiple-row subquery?

A) IS
B) <>
C) LIKE
D) BETWEEN
E) =
F) NOT IN

5. Which constraint can be defined only at the column level?

A) FOREIGN KEY
B) NOT NULL
C) PRIMARY KEY
D) UNIQUE
E) CHECK

Solutions: