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Oracle Database 23ai SQL Associate Sample Questions:

1. What is the result of using the following SQL query?
SELECT 100 + NULL AS result;

A) NULL
B) An error
C) 0
D) 100

2. What does the NEXTVAL pseudocolumn do in SQL?

A) Retrieves the next value in a sequence and increments the sequence
B) Retrieves the current value of a sequence without incrementing it
C) Deletes the sequence from the database
D) Resets the sequence to its starting value

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

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

4. What does a Cartesian product in SQL result from?

A) An INNER JOIN without specifying join conditions
B) An OUTER JOIN with NULL values
C) A NATURAL JOIN without specifying join conditions

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 with spaces in between
C) Concatenated first and last names without spaces
D) A syntax error

Solutions: