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Oracle Database 23ai SQL Associate Sample Questions:

1. What will the following query return?
SELECT TO_CHAR(SYSDATE, 'DD-MM-YYYY') AS formatted_date FROM dual;

A) The time part of the current date
B) The current date in the default system format
C) An error
D) The current date in the format 'DD-MM-YYYY'

2. What type of join does the following query perform?
SELECT *
FROM employees e, departments d
WHERE e.department_id = d.department_id;

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

3. Which of the following can be achieved using a correlated subquery?

A) Retrieving duplicate records from a single table
B) Inserting data into a table
C) Joining two tables without a common column
D) Comparing each employee's salary to the average salary of their department

4. Which command creates a new role in Oracle Database?

A) CREATE NEW ROLE role_name;
B) CREATE ROLE role_name;
C) ADD ROLE role_name;

5. In a relational database, what is a foreign key?

A) A key that is used to establish a relationship between two tables
B) A unique identifier for a record in a table
C) A temporary key generated during query execution
D) A key used to sort data in a specific order

Solutions: