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Oracle Database 23ai SQL Associate Sample Questions:

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

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

2. What does the following SQL query do?
SELECT *
FROM employees e
JOIN employees m ON e.manager_id = m.employee_id;

A) Lists employees who are managers
B) Lists employees and their corresponding managers
C) Lists employees who are not managers
D) Lists employees without departments

3. What does the following SQL statement do?
CREATE TABLE employees (
employee_id NUMBER PRIMARY KEY,
first_name VARCHAR2(50),
hire_date DATE NOT NULL
);

A) Creates a table with no constraints
B) Creates a temporary table
C) Creates a table with a primary key and a NOT NULL constraint
D) Creates a table with only VARCHAR2 and DATE columns

4. Which type of subquery returns exactly one value?

A) Scalar subquery
B) Inline view
C) Multiple-row subquery
D) Correlated subquery

5. What does the following SQL statement do?
ALTER TABLE employees DROP COLUMN salary;

A) Drops the salary column from the employees table
B) Deletes the employees table
C) Removes duplicate rows from the employees table
D) Sets the salary column to NULL for all rows

Solutions: