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Oracle Database 23ai SQL Associate Sample Questions:

1. What does the INTERSECT operator do in SQL?

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

2. Which SQL function calculates the number of months between two dates?
Response:

A) MONTHS_BETWEEN
B) TIME_DIFF
C) DATE_CALC
D) DATE_DIFF

3. Which component of an ERD (Entity-Relationship Diagram) represents the attributes of an entity?

A) Ovals
B) Diamonds
C) Arrows
D) Rectangles

4. Which type of subquery returns exactly one value?

A) Inline view
B) Multiple-row subquery
C) Scalar subquery
D) Correlated subquery

5. What will the following query return?
SELECT TO_CHAR(SYSDATE, 'DD-MM-YYYY') AS formatted_date FROM dual;

A) The time part of the current date
B) The current date in the format 'DD-MM-YYYY'
C) An error
D) The current date in the default system format

Solutions: