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Oracle 1Z0-171 Exam Syllabus Topics:

Oracle Database 23ai SQL Associate Sample Questions:

1. Which of the following is true about foreign key constraints in SQL?

A) They ensure that a column only contains NULL values.
B) They define a relationship between two tables.
C) They enforce the uniqueness of values in a column.

2. Which type of join retrieves only the rows with matching values in both tables?

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

3. How does SQL handle NULL values in arithmetic expressions?

A) Treats them as zero
B) Treats them as the largest possible number
C) Produces an error
D) Produces a NULL result

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

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

5. How are NULL values treated in relational databases?

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

Solutions: