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Oracle Database 23ai SQL Associate Sample Questions:

1. How are NULL values treated in relational databases?

A) NULL values are not allowed in relational databases.
B) NULL values represent missing or unknown data.
C) NULL values are treated as zero.
D) NULL values are treated as empty strings.

2. Which type of join includes rows that do not have matching values in the joined table?

A) CROSS JOIN
B) OUTER JOIN
C) INNER JOIN
D) SELF JOIN

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

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

4. Which type of subquery returns exactly one value?

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

5. What will the following SQL statement output?
SELECT first_name || ' ' || last_name AS full_name FROM employees;

A) Only the first names of employees
B) Concatenated first and last names without spaces
C) A syntax error
D) Concatenated first and last names with spaces in between

Solutions: