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Oracle Database 23ai SQL Associate Sample Questions:

1. Which clause in an UPDATE statement typically uses a subquery to assign values to columns?

A) SET
B) FROM
C) HAVING
D) WHERE

2. The column data type is converted to a primary key.

A) CREATE ALIAS
B) CREATE INDEX
C) CREATE SEQUENCE
D) CREATE SYNONYM

3. What will the following SQL query do?
UPDATE employees
SET salary = salary * 1.1
WHERE department_id = 10;

A) Set the salary to 1.1 for employees in department 10
B) Decrease the salary of employees in department 10 by 10%
C) Increase the salary of all employees by 10%
D) Increase the salary of employees in department 10 by 10%

4. What is required for the queries combined by a SET operator to work correctly?

A) The result sets must have the same number of columns and compatible data types.
B) Both queries must use the GROUP BY clause.
C) The tables must be joined using a primary key.
D) Both queries must include the WHERE clause.

5. What does a Cartesian product in SQL result from?

A) An INNER JOIN without specifying join conditions
B) An OUTER JOIN with NULL values
C) A NATURAL JOIN without specifying join conditions

Solutions: