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PostgreSQL MCQs and Answers With Explanation: For storing and managing massive amounts of data, many people utilize the open-source relational database management system PostgreSQL. A wide range of data formats is supported by PostgreSQL, together with powerful indexing and transaction management. Here in this article, you will be able to gather the PostgreSQL MCQ Quiz that tests your comprehension of PostgreSQL’s design, SQL queries, data types, and other sophisticated capabilities. We’ll give you a complete set of PostgreSQL Multiple Choice Questions in this article so you can test your knowledge and be ready for examinations and interviews.
PostgreSQL MCQ Questions & Answers
The PostgreSQL MCQ Quiz Questions and Answers with Explanation are great resources for people looking to improve their knowledge of and skill in dealing with PostgreSQL. You can learn more about the architecture, data types, indexing, and transaction management capabilities of PostgreSQL by taking a PostgreSQL MCQ & Online Quiz and checking thorough explanations for each question. You can use the complete list of the Top 55 PostgreSQL MCQs in this article to ease up your understanding of this potent relational database management system while preparing for examinations and interviews.
PostgreSQL Multiple Choice Questions
| Name | PostgreSQL |
| Exam Type | MCQ (Multiple Choice Questions) |
| Category | Technical Quiz |
| Mode of Quiz | Online |
Top 55 PostgreSQL Multiple Choice Questions | Practice PostgreSQL MCQ Quiz
1. What does PostgreSQL stand for?
a) Post-Graphical SQL
b) Post-Generated SQL
c) Post-Global SQL
d) Postgres Structured Query Language
Answer: d) Postgres Structured Query Language
Explanation: PostgreSQL is an open-source relational database management system (RDBMS) that uses and extends the SQL language.
2. Which language is used to write stored procedures and triggers in PostgreSQL?
a) Java
b) Python
c) C
d) PL/pgSQL
Answer: d) PL/pgSQL
Explanation: PL/pgSQL is a procedural programming language used by PostgreSQL to write stored procedures and triggers.
3. Which command is used to create a new database in PostgreSQL?
a) CREATE
b) SELECT
c) UPDATE
d) INSERT
Answer: a) CREATE
Explanation: The CREATE command is used to create a new database in PostgreSQL.
4. Which of the following is NOT a valid data type in PostgreSQL?
a) BOOLEAN
b) NUMERIC
c) DATE
d) STRING
Answer: d) STRING
Explanation: The correct data type in PostgreSQL is called “text,” not “string.”
5. Which command is used to connect to a PostgreSQL database from the command line?
a) PSQL
b) SQL
c) MySQL
d) MsSQL
Answer: a) PSQL
Explanation: The PSQL command is used to connect to a PostgreSQL database from the command line.
6. Which command is used to view the list of tables in a PostgreSQL database?
a) SHOW TABLES
b) LIST TABLES
c) DISPLAY TABLES
d) \dt
Answer: d) \dt
Explanation: The \dt command is used to view the list of tables in a PostgreSQL database.
7. Which command is used to create a new table in PostgreSQL?
a) CREATE TABLE
b) INSERT INTO
c) UPDATE TABLE
d) ALTER TABLE
Answer: a) CREATE TABLE
Explanation: The CREATE TABLE command is used to create a new table in PostgreSQL.
8. Which command is used to add a new column to an existing table in PostgreSQL?
a) CREATE COLUMN
b) ADD COLUMN
c) ALTER COLUMN
d) UPDATE COLUMN
Answer: b) ADD COLUMN
Explanation: The ADD COLUMN command is used to add a new column to an existing table in PostgreSQL.
9. Which command is used to remove a column from an existing table in PostgreSQL?
a) DROP COLUMN
b) DELETE COLUMN
c) REMOVE COLUMN
d) ALTER COLUMN
Answer: a) DROP COLUMN
Explanation: The DROP COLUMN command is used to remove a column from an existing table in PostgreSQL.
10. Which command is used to delete a table from a PostgreSQL database?
a) DELETE TABLE
b) DROP TABLE
c) REMOVE TABLE
d) ERASE TABLE
Answer: b) DROP TABLE
Explanation: The DROP TABLE command is used to delete a table from a PostgreSQL database.
11. Which command is used to create a new index in PostgreSQL?
a) CREATE INDEX
b) ADD INDEX
c) INSERT INDEX
d) ALTER INDEX
Answer: a) CREATE INDEX
Explanation: The CREATE INDEX command is used to create a new index in PostgreSQL.
12. Which command is used to remove an index from a PostgreSQL database?
a) REMOVE INDEX
b) DELETE INDEX
c) DROP INDEX
d) ERASE INDEX
Answer: c) DROP INDEX
Explanation: The DROP INDEX command is used to remove an index from a PostgreSQL database.
13. Which command is used to create a new sequence in PostgreSQL?
a) CREATE SEQUENCE
b) ADD SEQUENCE
c) INSERT SEQUENCE
d) ALTER SEQUENCE
Answer: a) CREATE SEQUENCE
Explanation: The CREATE SEQUENCE command is used to create a new sequence in PostgreSQL.
14. Which command is used to insert data into a table in PostgreSQL?
a) ADD
b) INSERT
c) UPDATE
d) CREATE
Answer: b) INSERT
Explanation: The INSERT command is used to insert data into a table in PostgreSQL.
15. Which command is used to update data in a table in PostgreSQL?
a) ADD
b) INSERT
c) UPDATE
d) CREATE
Answer: c) UPDATE
Explanation: The UPDATE command is used to update data in a table in PostgreSQL.
16. Which command is used to delete data from a table in PostgreSQL?
a) DELETE
b) DROP
c) REMOVE
d) ERASE
Answer: a) DELETE
Explanation: The DELETE command is used to delete data from a table in PostgreSQL.
17. Which command is used to grant privileges to a user in PostgreSQL?
a) GRANT
b) ALLOW
c) PERMIT
d) GRANT ALL
Answer: a) GRANT
Explanation: The GRANT command is used to grant privileges to a user in PostgreSQL.
18. Which command is used to revoke privileges from a user in PostgreSQL?
a) REVOKE
b) DENY
c) REMOVE
d) REVOKE ALL
Answer: a) REVOKE
Explanation: The REVOKE command is used to revoke privileges from a user in PostgreSQL.
19. Which command is used to create a new user in PostgreSQL?
a) CREATE USER
b) ADD USER
c) INSERT USER
d) ALTER USER
Answer: a) CREATE USER
Explanation: The CREATE USER command is used to create a new user in PostgreSQL.
20. Which command is used to change the password of a user in PostgreSQL?
a) CHANGE PASSWORD
b) ALTER USER
c) MODIFY USER
d) UPDATE USER
Answer: b) ALTER USER
Explanation: The ALTER USER command is used to change the password of a user in PostgreSQL.
21. Which command is used to create a new schema in PostgreSQL?
a) CREATE SCHEMA
b) ADD SCHEMA
c) INSERT SCHEMA
d) ALTER SCHEMA
Answer: a) CREATE SCHEMA
Explanation: The CREATE SCHEMA command is used to create a new schema in PostgreSQL.
22. Which command is used to drop a schema from a PostgreSQL database?
a) DROP SCHEMA
b) DELETE SCHEMA
c) REMOVE SCHEMA
d) ERASE SCHEMA
Answer: a) DROP SCHEMA
Explanation: The DROP SCHEMA command is used to drop a schema from a PostgreSQL database.
23. Which command is used to create a new view in PostgreSQL?
a) CREATE VIEW
b) ADD VIEW
c) INSERT VIEW
d) ALTER VIEW
Answer: a) CREATE VIEW
Explanation: The CREATE VIEW command is used to create a new view in PostgreSQL.
24. Which command is used to drop a view from a PostgreSQL database?
a) DROP VIEW
b) DELETE VIEW
c) REMOVE VIEW
d) ERASE VIEW
Answer: a) DROP VIEW
Explanation: The DROP VIEW command is used to drop a view from a PostgreSQL database.
25. Which command is used to create a new materialized view in PostgreSQL?
a) CREATE MATERIALIZED VIEW
b) ADD MATERIALIZED VIEW
c) INSERT MATERIALIZED VIEW
d) ALTER MATERIALIZED VIEW
Answer: a) CREATE MATERIALIZED VIEW
Explanation: The CREATE MATERIALIZED VIEW command is used to create a new materialized view in PostgreSQL.
26. Which command is used to refresh the data of a materialized view in PostgreSQL?
a) REFRESH MATERIALIZED VIEW
b) UPDATE MATERIALIZED VIEW
c) RELOAD MATERIALIZED VIEW
d) RENEW MATERIALIZED VIEW
Answer: a) REFRESH MATERIALIZED VIEW
Explanation: The REFRESH MATERIALIZED VIEW command is used to refresh the data of a materialized view in PostgreSQL.
27. Which command is used to create an index in PostgreSQL?
a) CREATE INDEX
b) ADD INDEX
c) INSERT INDEX
d) ALTER INDEX
Answer: a) CREATE INDEX
Explanation: The CREATE INDEX command is used to create an index in PostgreSQL.
28. Which command is used to drop an index from a PostgreSQL database?
a) DROP INDEX
b) DELETE INDEX
c) REMOVE INDEX
d) ERASE INDEX
Answer: a) DROP INDEX
Explanation: The DROP INDEX command is used to drop an index from a PostgreSQL database.
29. Which command is used to create a new function in PostgreSQL?
a) CREATE FUNCTION
b) ADD FUNCTION
c) INSERT FUNCTION
d) ALTER FUNCTION
Answer: a) CREATE FUNCTION
Explanation: The CREATE FUNCTION command is used to create a new function in PostgreSQL.
30. Which command is used to drop a function from a PostgreSQL database?
a) DROP FUNCTION
b) DELETE FUNCTION
c) REMOVE FUNCTION
d) ERASE FUNCTION
Answer: a) DROP FUNCTION
Explanation: The DROP FUNCTION command is used to drop a function from a PostgreSQL database.
31. Which command is used to create a new trigger in PostgreSQL?
a) CREATE TRIGGER
b) ADD TRIGGER
c) INSERT TRIGGER
d) ALTER TRIGGER
Answer: a) CREATE TRIGGER
Explanation: The CREATE TRIGGER command is used to create a new trigger in PostgreSQL.
32. Which command is used to drop a trigger from a PostgreSQL database?
a) DROP TRIGGER
b) DELETE TRIGGER
c) REMOVE TRIGGER
d) ERASE TRIGGER
Answer: a) DROP TRIGGER
Explanation: The DROP TRIGGER command is used to drop a trigger from a PostgreSQL database.
33. Which command is used to create a new tablespace in PostgreSQL?
a) CREATE TABLESPACE
b) ADD TABLESPACE
c) INSERT TABLESPACE
d) ALTER TABLESPACE
Answer: a) CREATE TABLESPACE
Explanation: The CREATE TABLESPACE command is used to create a new tablespace in PostgreSQL.
34. Which command is used to drop a tablespace from a PostgreSQL database?
a) DROP TABLESPACE
b) DELETE TABLESPACE
c) REMOVE TABLESPACE
d) ERASE TABLESPACE
Answer: a) DROP TABLESPACE
Explanation: The DROP TABLESPACE command is used to drop a tablespace from a PostgreSQL database.
35. Which command is used to create a new partition in a PostgreSQL table?
a) CREATE TABLE PARTITION
b) ADD TABLE PARTITION
c) INSERT TABLE PARTITION
d) ALTER TABLE PARTITION
Answer: a) CREATE TABLE PARTITION
Explanation: The CREATE TABLE PARTITION command is used to create a new partition in a PostgreSQL table.
36. Which command is used to drop a partition from a PostgreSQL table?
a) DROP TABLE PARTITION
b) DELETE TABLE PARTITION
c) REMOVE TABLE PARTITION
d) ERASE TABLE PARTITION
Answer: a) DROP TABLE PARTITION
Explanation: The DROP TABLE PARTITION command is used to drop a partition from a PostgreSQL table.
37. Which command is used to create a new foreign key constraint in a PostgreSQL table?
a) CREATE FOREIGN KEY
b) ADD FOREIGN KEY
c) INSERT FOREIGN KEY
d) ALTER FOREIGN KEY
Answer: a) CREATE FOREIGN KEY
Explanation: The CREATE FOREIGN KEY command is used to create a new foreign key constraint in a PostgreSQL table.
38. Which command is used to drop a foreign key constraint from a PostgreSQL table?
a) DROP FOREIGN KEY
b) DELETE FOREIGN KEY
c) REMOVE FOREIGN KEY
d) ERASE FOREIGN KEY
Answer: a) DROP FOREIGN KEY
Explanation: The DROP FOREIGN KEY command is used to drop a foreign key constraint from a PostgreSQL table.
39. Which command is used to add a new column to a PostgreSQL table?
a) ALTER TABLE
b) ADD COLUMN
c) INSERT COLUMN
d) CREATE COLUMN
Answer: b) ADD COLUMN
Explanation: The ADD COLUMN command is used to add a new column to a PostgreSQL table.
40. Which command is used to rename a PostgreSQL table?
a) ALTER TABLE
b) RENAME TABLE
c) CHANGE TABLE
d) MODIFY TABLE
Answer: a) ALTER TABLE
Explanation: The ALTER TABLE command is used to rename a PostgreSQL table.
41. Which command is used to rename a column in a PostgreSQL table?
a) ALTER COLUMN
b) RENAME COLUMN
c) CHANGE COLUMN
d) MODIFY COLUMN
Answer: b) RENAME COLUMN
Explanation: The RENAME COLUMN command is used to rename a column in a PostgreSQL table.
42. Which command is used to change the data type of a column in a PostgreSQL table?
a) ALTER TABLE
b) MODIFY COLUMN
c) CHANGE COLUMN
d) ALTER COLUMN
Answer: d) ALTER COLUMN
Explanation: The ALTER COLUMN command is used to change the data type of a column in a PostgreSQL table.
43. Which command is used to add a new constraint to a PostgreSQL table?
a) ADD CONSTRAINT
b) CREATE CONSTRAINT
c) INSERT CONSTRAINT
d) ALTER CONSTRAINT
Answer: a) ADD CONSTRAINT
Explanation: The ADD CONSTRAINT command is used to add a new constraint to a PostgreSQL table.
44. Which command is used to drop a constraint from a PostgreSQL table?
a) DROP CONSTRAINT
b) DELETE CONSTRAINT
c) REMOVE CONSTRAINT
d) ERASE CONSTRAINT
Answer: a) DROP CONSTRAINT
Explanation: The DROP CONSTRAINT command is used to drop a constraint from a PostgreSQL table.
45. Which command is used to create a new schema in a PostgreSQL database?
a) CREATE SCHEMA
b) ADD SCHEMA
c) INSERT SCHEMA
d) ALTER SCHEMA
Answer: a) CREATE SCHEMA
Explanation: The CREATE SCHEMA command is used to create a new schema in a PostgreSQL database.
46. Which command is used to drop a user from PostgreSQL?
a) DROP USER
b) DELETE USER
c) REMOVE USER
d) ERASE USER
Answer: a) DROP USER
Explanation: The DROP USER command is used to drop a user from PostgreSQL.
47. Which command is used to change the password of a user in PostgreSQL?
a) ALTER USER
b) CHANGE PASSWORD
c) MODIFY USER
d) SET PASSWORD
Answer: a) ALTER USER
Explanation: The ALTER USER command is used to change the password of a user in PostgreSQL.
48. Which command is used to display information about the current database in PostgreSQL?
a) SELECT DATABASE
b) SHOW DATABASE
c) DESCRIBE DATABASE
d) DATABASE INFO
Answer: b) SHOW DATABASE
Explanation: The SHOW DATABASE command is used to display information about the current database in PostgreSQL.
49. Which command is used to display information about the tables in a PostgreSQL database?
a) SELECT TABLES
b) SHOW TABLES
c) DESCRIBE TABLES
d) TABLES INFO
Answer: b) SHOW TABLES
Explanation: The SHOW TABLES command is used to display information about the tables in a PostgreSQL database.
50. Which command is used to display the structure of a PostgreSQL table?
a) SELECT TABLE
b) SHOW TABLE
c) DESCRIBE TABLE
d) TABLE STRUCTURE
Answer: c) DESCRIBE TABLE
Explanation: The DESCRIBE TABLE command is used to display the structure of a PostgreSQL table.
51. Which command is used to display the data in a PostgreSQL table?
a) SELECT DATA
b) SHOW DATA
c) DESCRIBE DATA
d) TABLE DATA
Answer: a) SELECT DATA
Explanation: The SELECT DATA command is used to display the data in a PostgreSQL table.
52. Which command is used to display the indexes on a PostgreSQL table?
a) SHOW INDEXES
b) DISPLAY INDEXES
c) DESCRIBE INDEXES
d) INDEX INFO
Answer: a) SHOW INDEXES
Explanation: The SHOW INDEXES command is used to display the indexes on a PostgreSQL table.
53. Which command is used to create a new index on a PostgreSQL table?
a) CREATE INDEX
b) ADD INDEX
c) INSERT INDEX
d) ALTER INDEX
Answer: a) CREATE INDEX
Explanation: The CREATE INDEX command is used to create a new index on a PostgreSQL table.
54. Which command is used to drop an index from a PostgreSQL table?
a) DROP INDEX
b) DELETE INDEX
c) REMOVE INDEX
d) ERASE INDEX
Answer: a) DROP INDEX
Explanation: The DROP INDEX command is used to drop an index from a PostgreSQL table.
55. Which command is used to drop a view from PostgreSQL?
a) DROP VIEW
b) DELETE VIEW
c) REMOVE VIEW
d) ERASE VIEW
Answer: a) DROP VIEW
Explanation: The DROP VIEW command is used to drop a view from PostgreSQL.
The PostgreSQL MCQs and Answers with Explanation, in conclusion, offer a thorough and vast resource for anyone looking to improve their knowledge of and skill with this potent relational database management system. Users can check their understanding of PostgreSQL’s design, data types, indexing, and transaction management by completing these PostgreSQL MCQ & Online Quiz and studying the in-depth explanations. Stay tuned to our FreshersNow website for regular updates on technical quizzes covering various IT-related concepts.