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Oracle Database 23ai SQL Associate Sample Questions:

1. Which of the following ensures that a relational database enforces data integrity?

A) Redundant data storage
B) Indexes on all columns
C) Constraints such as primary keys, foreign keys, and unique constraints
D) Hierarchical data organization

2. What is the result of the following SQL query?
SELECT COALESCE(NULL, 100, 200) AS result FROM dual;

A) 200
B) NULL
C) 100
D) 300

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 all rows where department_id is 20
D) Delete the department_id column in the employees table

4. Which clause in a SQL SELECT statement is used to define the columns to be retrieved?

A) GROUP BY
B) SELECT
C) WHERE
D) FROM

5. Which component of an ERD (Entity-Relationship Diagram) represents the attributes of an entity?

A) Arrows
B) Ovals
C) Diamonds
D) Rectangles

Solutions: