Oracle

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ORACLE

ASSESSMENT

(YOU HAVE ONLY 30 MINUTES TO COMPLETE THIS PART [20 Questions])

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1. What is the purpose of the UNION ALL operator in Oracle?

To combine the result sets of two or more SELECT statements

To join tables based on a condition

To filter rows in a query

To exclude duplicate rows from the result set

2. In Oracle, what is the purpose of the SAVEPOINT statement?

To undo changes made by the current transaction

To create a checkpoint within a transaction

To commit the current transaction

To create a subquery

3. What is the purpose of the ROLLBACK statement in Oracle?

To undo changes made by the current transaction

To permanently delete data from a table

To commit the current transaction

To create a save point

4. Which clause is used to sort the result set in descending order in Oracle?

DESC

ORDER DESC

SORT DESC

DESCENDING

5. What is the purpose of the HAVING clause in Oracle?

To filter rows in a query

To filter columns in a query

To filter groups in a query

To filter results based on a condition

6. In Oracle, what is a primary key used for?

To enforce uniqueness in a column

To establish relationships between tables

To provide a default value for a column

To sort the result set

7. Which function is used to find the total number of rows in a table in Oracle?

COUNT

SUM

AVG

MAX

8. Which statement is used to remove a table from the database in Oracle?

REMOVE TABLE

DELETE TABLE

DROP TABLE

ERASE TABLE

9. In Oracle, what is the purpose of the SELECT statement?

To update records

To retrieve data

To delete records

To insert records

10. What does SQL stand for?

Structured Language

Standard Query Language

System Query Language

Sequential Query Language

11. Which SQL function is used to find the highest value in a column in Oracle?

SUM

MIN

AVG

MAX

12. What is the purpose of the GROUP BY clause in Oracle?

To filter rows in a query

To sort the result set

To group rows based on a column

To join tables

13. Which statement is used to add a new column to an existing table in Oracle?

ADD COLUMN

CREATE COLUMN

ALTER TABLE ADD COLUMN

INSERT COLUMN

14. In Oracle, which operator is used to combine the result sets of two or more SELECT statements?

UNION

JOIN

CONCAT

MERGE

15. What is the purpose of the NVL function in Oracle?

To convert a value to uppercase

To replace NULL with a specified value

To concatenate two strings

To find the length of a string

16. Which Oracle command is used to commit the current transaction?

ROLLBACK

SAVEPOINT

COMMIT

BEGIN TRANSACTION

17. What is the purpose of the WHERE clause in a SQL query?

To specify the order of the result set

To filter the rows returned by a query

To join tables

To group rows based on a column

18. What is the purpose of the TRUNCATE statement in Oracle?

To delete all rows from a table

To remove a table from the database

To empty a table without logging individual row deletions

To drop a column from a table

19. Which data type is used to store variable-length character strings in Oracle?

CHAR

VARCHAR

CLOB

BLOB

20. Which SQL operator is used for pattern matching in Oracle?

BETWEEN

EXISTS

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