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Oracle Database 23ai SQL Associate Sample Questions:

1. What is a SELF JOIN in SQL?

A) A join of a table with itself
B) A join used for Cartesian products
C) A join between tables with identical structures
D) A join that does not require a WHERE clause

2. What is a sequence in Oracle Database?

A) A database object that generates a series of unique numeric values
B) A predefined set of SQL queries executed in order
C) A list of numbers stored in a table
D) A type of index used for sorting rows

3. What does the NEXTVAL pseudocolumn do in SQL?

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

4. What does the INTERSECT operator do in SQL?

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

5. What is the result of the following SQL query?
SELECT COALESCE(NULL, 100, 200) AS result FROM dual;

A) 300
B) 100
C) 200
D) NULL

Solutions: