[Solved] What is the main purpose of using a subquery in the FROM clause in PostgreSQL? — Ans: To create a temporary table that can be used in the main query | PostgreSQL

PostgreSQL - Subqueries in PostgreSQL

What is the main purpose of using a subquery in the FROM clause in PostgreSQL?

ATo create a permanent table in the database

BTo update data in multiple tables at once

CTo delete rows from a table based on a condition

DTo create a temporary table that can be used in the main query

Step-by-Step Solution

Solution:

Step 1: Understand the role of subqueries in FROM
Subqueries in the FROM clause act like temporary tables that exist only during the query execution.
Step 2: Compare with other options
Updating or deleting data and creating permanent tables are not done by subqueries in FROM.
Final Answer:
To create a temporary table that can be used in the main query -> Option D
Quick Check:
Subquery in FROM = temporary table [OK]

Quick Trick: Subquery in FROM = think temporary table [OK]

Common Mistakes:

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What is the main purpose of using a subquery in the FROM clause in PostgreSQL?