Oracle 1Z1-171 : Oracle Database 23ai SQL Associate

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Oracle Database 23ai SQL Associate Sample Questions:

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

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

2. What is a subquery in SQL?

A) A query used to create a table
B) A query inside another query
C) A query used for joining two or more tables
D) A query that combines data from multiple tables

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

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

4. What is the result of the following query?
SELECT employee_id
FROM employees
WHERE EXISTS (SELECT 1 FROM departments WHERE department_id = 10);

A) All employee IDs
B) Employee IDs from departments with no employees
C) Employee IDs from department 10
D) Employees with salaries greater than 10

5. How can you ensure that data is sorted in descending order in a SQL query?

A) Use the ASC keyword
B) Use the DESC keyword
C) Use the ORDER keyword
D) Use the DISTINCT keyword

Solutions: