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 is the purpose of the ROWID in Oracle?

To uniquely identify a row in a table

To store the row count in a table

To specify the order of the result set

To create a primary key

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

BETWEEN

EXISTS

4. What is the purpose of the EXISTS operator in Oracle?

To check if a table exists in the database

To check if a column exists in a table

To check if a value exists in a column

To check if a subquery returns any rows

5. 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

6. 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

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

Descending

Ascending

Random

Alphabetical

8. Which function is used to find the minimum value in a column in Oracle?

MIN

AVG

MAX

SUM

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

UNION

JOIN

CONCAT

MERGE

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

ALIAS

NAME

RENAME

11. 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

12. 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

13. Which statement is used to grant privileges to a user in Oracle?

ALLOW

GRANT

GIVE

PERMISSION

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

SUM

MIN

AVG

MAX

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

AVG

SUM

MIN

MAX

16. 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

17. In Oracle, what does the term "DDL" stand for?

Data Definition Language

Data Description Language

Database Definition Language

Database Description Language

18. What is the purpose of the OUTER JOIN in Oracle?

To exclude rows that do not meet the condition

To include only rows that meet the condition

To include all rows from both tables, even if there is no match

To filter rows based on a condition

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

ROLLBACK

SAVEPOINT

COMMIT

BEGIN TRANSACTION

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

COUNT

SUM

AVG

MAX

5 out of 4

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