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Oracle Database 23ai SQL Associate Sample Questions:

1. Which type of join retrieves only the rows with matching values in both tables?

A) NATURAL JOIN
B) OUTER JOIN
C) INNER JOIN
D) CROSS JOIN

2. What does the following SQL statement do?
SELECT e.employee_id, d.department_name
FROM employees e
JOIN departments d ON e.department_id = d.department_id;

A) Retrieves all employees and their departments
B) Retrieves only employees without departments
C) Retrieves employees and departments with matching department_id
D) Retrieves only departments with no employees

3. Which SQL statement is used to insert a new row into a table?

A) SELECT
B) UPDATE
C) ALTER
D) INSERT

4. How can a synonym benefit database design?

A) It provides a consistent reference to database objects, even if their underlying names change.
B) It allows the renaming of columns in a table.
C) It improves query execution time.
D) It enforces constraints on table columns.

5. Which SQL JOIN keyword retrieves all rows from both tables, including those without matches?

A) FULL OUTER JOIN
B) RIGHT
C) LEFT
D) CROSS

Solutions: