{"id":10274,"date":"2023-05-02T10:57:09","date_gmt":"2023-05-02T10:57:09","guid":{"rendered":"https:\/\/www.scmgalaxy.com\/tutorials\/?p=10274"},"modified":"2023-06-19T13:29:43","modified_gmt":"2023-06-19T13:29:43","slug":"top-50-postgresql-interview-questions-with-answers","status":"publish","type":"post","link":"https:\/\/www.scmgalaxy.com\/tutorials\/top-50-postgresql-interview-questions-with-answers\/","title":{"rendered":"Top 50 Postgresql Interview Questions with Answers"},"content":{"rendered":"<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.scmgalaxy.com\/tutorials\/wp-content\/uploads\/2023\/05\/image-53.png\" alt=\"\" class=\"wp-image-10275\" width=\"684\" height=\"379\" srcset=\"https:\/\/www.scmgalaxy.com\/tutorials\/wp-content\/uploads\/2023\/05\/image-53.png 900w, https:\/\/www.scmgalaxy.com\/tutorials\/wp-content\/uploads\/2023\/05\/image-53-300x167.png 300w, https:\/\/www.scmgalaxy.com\/tutorials\/wp-content\/uploads\/2023\/05\/image-53-768x427.png 768w\" sizes=\"auto, (max-width: 684px) 100vw, 684px\" \/><figcaption class=\"wp-element-caption\"><strong><em>Postgresql Interview Questions with Answers<\/em><\/strong><\/figcaption><\/figure>\n<\/div>\n\n\n<ol class=\"wp-block-list\">\n<li>What is PostgreSQL?<br>a) A programming language<br>b) A relational database management system<br>c) A web framework<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b) A relational database management system<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"2\">\n<li>Which of the following is not a data type in PostgreSQL?<br>a) VARCHAR<br>b) INTEGER<br>c) DECIMAL<br>d) CHARACTER<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: d) CHARACTER<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"3\">\n<li>Which command is used to create a database in PostgreSQL?<br>a) CREATE DATABASE<br>b) NEW DATABASE<br>c) ADD DATABASE<br>d) MAKE DATABASE<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a) CREATE DATABASE<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"4\">\n<li>Which command is used to connect to a database in PostgreSQL?<br>a) CONNECT TO<br>b) ATTACH TO<br>c) USE<br>d) \\c<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: d) \\c<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"5\">\n<li>What is the default port for PostgreSQL?<br>a) 80<br>b) 3306<br>c) 5432<br>d) 8080<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c) 5432<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"6\">\n<li>Which of the following is not a valid indexing method in PostgreSQL?<br>a) B-tree<br>b) Hash<br>c) Inverted<br>d) GiST<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c) Inverted<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"7\">\n<li>Which operator is used for string concatenation in PostgreSQL?<br>a) ||<br>b) +<br>c) &amp;<br>d) ~<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a) ||<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"8\">\n<li>Which command is used to backup a PostgreSQL database?<br>a) COPY<br>b) EXPORT<br>c) DUMP<br>d) BACKUP<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c) DUMP<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"9\">\n<li>Which of the following is not a valid join type in PostgreSQL?<br>a) INNER JOIN<br>b) LEFT JOIN<br>c) RIGHT JOIN<br>d) CROSS JOIN<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: d) CROSS JOIN<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"10\">\n<li>Which command is used to modify existing data in a table in PostgreSQL?<br>a) UPDATE<br>b) INSERT<br>c) ALTER<br>d) DELETE<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a) UPDATE<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"11\">\n<li>Which function is used to return the current date and time in PostgreSQL?<br>a) NOW()<br>b) DATE()<br>c) TIME()<br>d) CURRENT_TIMESTAMP()<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a) NOW()<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"12\">\n<li>Which statement is used to grant privileges in PostgreSQL?<br>a) ALLOW<br>b) PERMIT<br>c) GRANT<br>d) AUTHENTICATE<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c) GRANT<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"13\">\n<li>Which statement is used to revoke privileges in PostgreSQL?<br>a) REMOVE<br>b) REVOKE<br>c) DENY<br>d) DISALLOW<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b) REVOKE<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"14\">\n<li>Which of the following is not a valid constraint type in PostgreSQL?<br>a) PRIMARY KEY<br>b) FOREIGN KEY<br>c) UNIQUE<br>d) CHECK<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b) FOREIGN KEY<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"15\">\n<li>Which statement is used to add a new column to an existing table in PostgreSQL?<br>a) ALTER TABLE<br>b) MODIFY TABLE<br>c) ADD COLUMN<br>d) CREATE COLUMN<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c) ADD COLUMN<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"16\">\n<li>Which of the following is not a valid data manipulation statement in PostgreSQL?<br>a) SELECT<br>b) INSERT<br>c) UPDATE<br>d) DELETE<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: d) DELETE<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"17\">\n<li>Which of the following is not a valid built-in function in PostgreSQL?<br>a) LENGTH<br>b) MAXIMUM<br>c) SUM<br>d) COUNT<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b) MAXIMUM<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"18\">\n<li>Which statement is used to create a table in PostgreSQL?<br>a) CREATE TABLE<br>b) ADD TABLE<br>c) NEW TABLE<br>d) MAKE TABLE<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a) CREATE TABLE<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"19\">\n<li>Which of the following is not a valid transaction isolation level in PostgreSQL?<br>a) READ COMMITTED<br>b) REPEATABLE READ<br>c) SERIALIZABLE<br>d) READ UNCOMMITTED<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: d) READ UNCOMMITTED<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"20\">\n<li>Which statement is used to remove a table from a database in PostgreSQL?<br>a) DELETE TABLE<br>b) DROP TABLE<br>c) REMOVE TABLE<br>d) ERASE TABLE<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b) DROP TABLE<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"21\">\n<li>Which of the following is not a valid way to specify a connection string in PostgreSQL?<br>a) host=localhost port=5432 dbname=mydb user=myuser password=mypassword<br>b) postgresql:\/\/myuser:mypassword@localhost:5432\/mydb<br>c) user=myuser password=mypassword host=localhost port=5432 dbname=mydb<br>d) None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: d) None of the above<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"22\">\n<li>Which statement is used to truncate a table in PostgreSQL?<br>a) DELETE FROM<br>b) TRUNCATE TABLE<br>c) DROP TABLE<br>d) REMOVE TABLE<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b) TRUNCATE TABLE<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"23\">\n<li>Which of the following is not a valid privilege in PostgreSQL?<br>a) SELECT<br>b) INSERT<br>c) UPDATE<br>d) READ<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: d) READ<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"24\">\n<li>Which statement is used to create an index in PostgreSQL?<br>a) CREATE INDEX<br>b) ADD INDEX<br>c) NEW INDEX<br>d) MAKE INDEX<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a) CREATE INDEX<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"25\">\n<li>Which of the following is not a valid data type for a column in PostgreSQL?<br>a) BOOLEAN<br>b) FLOAT<br>c) REAL<br>d) DOUBLE PRECISION<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b) FLOAT<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"26\">\n<li>Which statement is used to insert data into a table in PostgreSQL?<br>a) ADD INTO<br>b) INSERT INTO<br>c) PUT INTO<br>d) CREATE INTO<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b) INSERT INTO<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"27\">\n<li>Which command is used to grant privileges to a role in PostgreSQL?<br>a) ALTER ROLE<br>b) GRANT<br>c) ALTER PRIVILEGES<br>d) ALLOW<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b) GRANT<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"28\">\n<li>Which statement is used to change the data type of a column in PostgreSQL?<br>a) ALTER TYPE<br>b) ALTER TABLE<br>c) CHANGE COLUMN<br>d) MODIFY COLUMN<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: d) MODIFY COLUMN<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"29\">\n<li>Which command is used to create a sequence in PostgreSQL?<br>a) CREATE SEQUENCE<br>b) ADD SEQUENCE<br>c) NEW SEQUENCE<br>d) MAKE SEQUENCE<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a) CREATE SEQUENCE<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"30\">\n<li>Which function is used to calculate the length of a string in PostgreSQL?<br>a) LENGTH()<br>b) SIZE()<br>c) CHAR_LENGTH()<br>d) BYTE_LENGTH()<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a) LENGTH()<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"31\">\n<li>Which of the following is not a valid way to specify a schema name in PostgreSQL?<br>a) public.mytable<br>b) myschema.mytable<br>c) table.mytable<br>d) mytable.mytable<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c) table.mytable<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"32\">\n<li>Which statement is used to rename a table in PostgreSQL?<br>a) ALTER TABLE<br>b) RENAME TABLE<br>c) MODIFY TABLE<br>d) CHANGE TABLE<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b) RENAME TABLE<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"33\">\n<li>Which of the following is not a valid way to specify a foreign key in PostgreSQL?<br>a) FOREIGN KEY (column_name) REFERENCES table_name (column_name)<br>b) column_name REFERENCES table_name (column_name)<br>c) column_name FOREIGN KEY REFERENCES table_name (column_name)<br>d) CONSTRAINT constraint_name FOREIGN KEY (column_name) REFERENCES table_name (column_name)<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b) column_name REFERENCES table_name (column_name)<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"34\">\n<li>Which statement is used to delete a row from a table in PostgreSQL based on a condition?<br>a) DELETE<br>b) REMOVE<br>c) ERASE<br>d) DROP<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a) DELETE<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"35\">\n<li>Which of the following is not a valid aggregate function in PostgreSQL?<br>a) SUM<br>b) COUNT<br>c) AVG<br>d) PRODUCT<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: d) PRODUCT<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"36\">\n<li>Which statement is used to create a view in PostgreSQL?<br>a) CREATE VIEW<br>b) ADD VIEW<br>c) NEW VIEW<br>d) MAKE VIEW<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a) CREATE VIEW<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"37\">\n<li>Which command is used to create a user in PostgreSQL?<br>a) CREATE USER<br>b) ADD USER<br>c) NEW USER<br>d) MAKE USER<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a) CREATE USER<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"38\">\n<li>Which of the following is not a valid way to specify a default value for a column in PostgreSQL?<br>a) DEFAULT &#8216;value&#8217;<br>b) DEFAULT (expression)<br>c) DEFAULT NOW()<br>d) DEFAULT 0.0<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: d) DEFAULT 0.0<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"39\">\n<li>Which statement is used to add a new constraint to an existing table in PostgreSQL?<br>a) ADD CONSTRAINT<br>b) CREATE CONSTRAINT<br>c) NEW CONSTRAINT<br>d) MAKE CONSTRAINT<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a) ADD CONSTRAINT<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"40\">\n<li>Which of the following is not a valid data type for an index in PostgreSQL?<br>a) B-tree<br>b) Hash<br>c) GIN<br>d) SET<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: d) SET<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"41\">\n<li>Which statement is used to create a trigger in PostgreSQL?<br>a) CREATE TRIGGER<br>b) ADD TRIGGER<br>c) NEW TRIGGER<br>d) MAKE TRIGGER<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a) CREATE TRIGGER<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"42\">\n<li>Which of the following is not a valid way to specify a column constraint in PostgreSQL?<br>a) PRIMARY KEY<br>b) FOREIGN KEY<br>c) CHECK<br>d) INDEX<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: d) INDEX<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"43\">\n<li>Which statement is used to update multiple rows in a table in PostgreSQL based on a condition?<br>a) UPDATE ALL<br>b) UPDATE<br>c) MODIFY<br>d) CHANGE<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b) UPDATE<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"44\">\n<li>Which of the following is not a valid way to specify a column alias in PostgreSQL?<br>a) column_name AS alias_name<br>b) column_name alias_name<br>c) &#8220;column_name&#8221; alias_name<br>d) None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b) column_name alias_name<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"45\">\n<li>Which statement is used to create a temporary table in PostgreSQL?<br>a) CREATE TABLE<br>b) ADD TABLE<br>c) NEW TABLE<br>d) CREATE TEMPORARY TABLE<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: d) CREATE TEMPORARY TABLE<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"46\">\n<li>Which function is used to return the substring of a string in PostgreSQL?<br>a) SUBSTRING()<br>b) MID()<br>c) LEFT()<br>d) RIGHT()<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a) SUBSTRING()<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"47\">\n<li>Which of the following is not a valid way to specify a table alias in PostgreSQL?<br>a) table_name AS alias_name<br>b) table_name alias_name<br>c) &#8220;table_name&#8221; alias_name<br>d) None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: b) table_name alias_name<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"48\">\n<li>Which statement is used to commit a transaction in PostgreSQL?<br>a) END TRANSACTION<br>b) CLOSE TRANSACTION<br>c) COMMIT<br>d) FINISH TRANSACTION<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c) COMMIT<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"49\">\n<li>Which function is used to return the position of a substring in a string in PostgreSQL?<br>a) POSITION()<br>b) LOCATE()<br>c) FIND()<br>d) SEARCH()<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: a) POSITION()<\/h4>\n\n\n\n<ol class=\"wp-block-list\" start=\"50\">\n<li>Which of the following is not a valid way to specify a column in PostgreSQL?<br>a) table_name.column_name<br>b) column_name<br>c) column_name AS alias_name<br>d) None of the above<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Answer: c) column_name AS alias_name<\/h4>\n","protected":false},"excerpt":{"rendered":"<p>Answer: b) A relational database management system Answer: d) CHARACTER Answer: a) CREATE DATABASE Answer: d) \\c Answer: c) 5432 [&hellip;]<\/p>\n","protected":false},"author":33,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_joinchat":[],"footnotes":""},"categories":[1],"tags":[],"class_list":["post-10274","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast 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