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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 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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