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Oracle Database 23ai SQL Associate Sample Questions:

1. Which SQL JOIN keyword retrieves all rows from both tables, including those without matches?

A) LEFT
B) CROSS
C) FULL OUTER JOIN
D) RIGHT

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

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

3. What is the default order of evaluation when multiple SET operators are used in a query?

A) UNION, MINUS, INTERSECT
B) UNION, INTERSECT, MINUS
C) INTERSECT, UNION, MINUS
D) INTERSECT, MINUS, UNION

4. What does the NEXTVAL pseudocolumn do in SQL?

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

5. Which of the following is a valid reason to create a synonym?

A) To provide simplified and consistent access to an object
B) To improve query performance
C) To automatically generate numeric values for a column
D) To enforce unique constraints on a table

Solutions: