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Oracle Database 23ai SQL Associate Sample Questions:

1. What does the INTERSECT operator do in SQL?

A) Combines rows from two queries and includes all duplicates
B) Returns rows from the first query that are not present in the second query
C) Combines all rows from two queries without any conditions
D) Returns rows that are present in both queries

2. What does the NEXTVAL pseudocolumn do in SQL?

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

3. In a relational database, what is a foreign key?

A) A key that is used to establish a relationship between two tables
B) A unique identifier for a record in a table
C) A temporary key generated during query execution
D) A key used to sort data in a specific order

4. What will the following query return?
SELECT EXTRACT(YEAR FROM CURRENT_DATE) AS year FROM dual;

A) An error due to incorrect syntax
B) The current year in the database time zone
C) The full date in the session time zone

5. What does the following query return?
SELECT ROUND(123.456, 1) AS rounded_value FROM dual;

A) 124
B) 123.4
C) 123.5
D) 123.45

Solutions: