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 INDEX in Oracle?

To define a unique constraint

To enforce referential integrity

To improve query performance

To create a virtual column

2. What does SQL stand for?

Structured Language

Standard Query Language

System Query Language

Sequential Query Language

3. 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

4. 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

5. 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

6. Which statement is used to update data in a table in Oracle?

CHANGE

MODIFY

UPDATE

ALTER

7. What is the purpose of the ORDER 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

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

ROLLBACK

SAVEPOINT

COMMIT

BEGIN TRANSACTION

9. Which SQL function is used to find the average value in a column in Oracle?

AVG

SUM

MIN

MAX

10. Which statement is used to delete data from a table in Oracle?

DELETE

REMOVE

DROP

TRUNCATE

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

COUNT

SUM

AVG

MAX

12. 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

13. In Oracle, what does the acronym PL/SQL stand for?

Procedural Language/Structured Query Language

Programming Language/Standard Query Language

Procedure Language/Structured Question Language

Procedural Logic/Structured Query Language

14. In Oracle, what is the purpose of the COMMIT statement?

To undo changes made by the current transaction

To permanently delete data from a table

To commit the current transaction

To create a savepoint

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

CHAR

VARCHAR

CLOB

BLOB

16. Which keyword is used to create an alias for a table or a column in Oracle?

ALIAS

NAME

RENAME

17. What is the default sorting order in an ORDER BY clause in Oracle?

Descending

Ascending

Random

Alphabetical

18. What is the purpose of the CONSTRAINT keyword in Oracle?

To specify a default value for a column

To enforce referential integrity

To create a virtual column

To filter rows in a query

19. 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

20. What is the purpose of the CASE statement in Oracle?

To define a loop in PL/SQL

To handle exceptions

To create a virtual column

To perform conditional logic in a query

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