30 Top Interview Questions and Answers (2024)

Ques 1

Explain the concept of ACID properties in the context of databases.

ACID stands for Atomicity, Consistency, Isolation, and Durability, ensuring the reliability of database transactions.

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Ques 2

What is the purpose of the WHERE clause in a PostgreSQL query?

The WHERE clause filters records based on a specified condition, allowing selective data retrieval.

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Ques 3

What is a foreign key, and how does it enforce referential integrity?

A foreign key is a field that refers to the primary key in another table. It enforces referential integrity by ensuring that values in the foreign key match values in the referenced table's primary key.

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Ques 4

Explain the purpose of the SERIAL data type in PostgreSQL.

SERIAL is an auto-incrementing integer data type often used for creating unique identifiers in a column. It is commonly used for primary key columns.

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Ques 5

What is the purpose of the pg_ctl utility in PostgreSQL?

The pg_ctl utility is used to start, stop, and control the PostgreSQL server, providing a convenient way to manage server processes.

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Ques 6

What is the purpose of the pg_dumpall utility in PostgreSQL?

The pg_dumpall utility is used to create a SQL script that can reconstruct an entire PostgreSQL database cluster, including all databases, users, and privileges.

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Interview Questions and Answers

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Freshers / Beginner level questions & answers

Explain the concept of ACID properties in the context of databases.

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What is the purpose of the WHERE clause in a PostgreSQL query?

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What is a foreign key, and how does it enforce referential integrity?

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Explain the purpose of the SERIAL data type in PostgreSQL.

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What is the purpose of the pg_ctl utility in PostgreSQL?

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What is the purpose of the pg_dumpall utility in PostgreSQL?

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