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Oracle Database 23ai SQL Associate Sample Questions:

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

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

2. What is a SELF JOIN in SQL?

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

3. Which of the following statements is true about constraints in Oracle Database?

A) Constraints are automatically dropped when rows are deleted.
B) Constraints can only be added when creating a table.
C) Constraints cannot reference other tables.
D) Constraints can be added or modified using the ALTER TABLE statement.

4. 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

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

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

Solutions: