[Solved] What is the main purpose of using a LATERAL join in PostgreSQL? — Ans: To run a subquery for each row of the main table using that row's data | PostgreSQL

PostgreSQL - Joins in PostgreSQL

What is the main purpose of using a LATERAL join in PostgreSQL?

ATo run a subquery for each row of the main table using that row's data

BTo join two tables without any condition

CTo create a temporary table for all rows at once

DTo speed up queries by caching results

Step-by-Step Solution

Solution:

Step 1: Understand what LATERAL join does
A LATERAL join allows a subquery to use columns from the current row of the main query.
Step 2: Identify the main purpose
This means the subquery runs once per row, using that row's data to produce related results.
Final Answer:
To run a subquery for each row of the main table using that row's data -> Option A
Quick Check:
LATERAL join = per-row subquery execution [OK]

Quick Trick: LATERAL runs subqueries per row using that row's data [OK]

Common Mistakes:

Master "Joins in PostgreSQL" in PostgreSQL

9 interactive learning modes - each teaches the same concept differently

What is the main purpose of using a LATERAL join in PostgreSQL?