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Oracle Database 23ai SQL Associate Sample Questions:

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

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

2. Which SQL clause can be used in Oracle to limit the number of rows returned?

A) WHERE
B) FETCH FIRST n ROWS ONLY
C) DISTINCT
D) GROUP BY

3. What will the following query do?
DELETE FROM employees
WHERE department_id = 20;

A) Raise an error because DELETE cannot use a WHERE clause
B) Delete all rows in the employees table
C) Delete the department_id column in the employees table
D) Delete all rows where department_id is 20

4. Which Oracle SQL function returns the current date and time, including time zone information?

A) CURRENT_DATE
B) CURRENT_TIMESTAMP
C) NOW
D) SYSDATE

5. Which command is used to add a new column to an existing table?

A) ADD COLUMN
B) MODIFY COLUMN
C) ALTER TABLE
D) ALTER COLUMN

Solutions: