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Oracle Database 23ai SQL Associate Sample Questions:

1. What is the purpose of the MERGE statement in SQL?

A) To update existing rows or insert new rows in a target table
B) To delete duplicate rows from a table
C) To join two tables into one
D) To combine the results of two queries

2. What is the purpose of a correlated subquery?

A) A subquery that can be used only with aggregate functions
B) A subquery that depends on the result of another subquery
C) A subquery that combines data from multiple tables
D) A subquery that references columns from the outer query

3. The column data type is converted to a primary key.

A) CREATE INDEX
B) CREATE SYNONYM
C) CREATE ALIAS
D) CREATE SEQUENCE

4. Which INTERVAL data type would you use to store a period of time in years and months?

A) INTERVAL YEAR TO MONTH
B) INTERVAL MONTH TO DAY
C) INTERVAL DAY TO SECOND
D) INTERVAL MINUTE TO HOUR

5. What does the following SQL query do?
SELECT * FROM employees WHERE salary > 5000 ORDER BY department_id;

A) Retrieves employees with salary less than 5000, sorted by department ID
B) Retrieves all employees, sorted by department ID
C) Retrieves all employees with a salary greater than 5000, sorted by salary in ascending order
D) Retrieves all employees with a salary greater than 5000, sorted by department ID in ascending order

Solutions: