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Oracle Database 23ai SQL Associate Sample Questions:

1. What does the NEXTVAL pseudocolumn do in SQL?

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

2. Which of the following SQL commands retrieves data from a relational database?

A) DELETE
B) INSERT
C) UPDATE
D) SELECT

3. What does the following SQL statement do?
ALTER TABLE employees DROP COLUMN salary;

A) Sets the salary column to NULL for all rows
B) Drops the salary column from the employees table
C) Deletes the employees table
D) Removes duplicate rows from the employees table

4. Which clause in an UPDATE statement typically uses a subquery to assign values to columns?

A) FROM
B) SET
C) WHERE
D) HAVING

5. 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

Solutions: