[Solved] What is the main purpose of using LATERAL in a PostgreSQL query? — Ans: To allow a subquery to reference columns from tables listed before it in the... | PostgreSQL

PostgreSQL - Subqueries in PostgreSQL

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

ATo allow a subquery to reference columns from tables listed before it in the FROM clause

BTo create a temporary table that lasts only for the duration of the query

CTo optimize the query by parallelizing subqueries automatically

DTo enforce foreign key constraints between tables

Step-by-Step Solution

Solution:

Step 1: Understand the role of LATERAL
LATERAL allows a subquery to access columns from tables that appear earlier in the FROM clause.
Step 2: Compare with other options
The other options describe different features unrelated to LATERAL's purpose.
Final Answer:
To allow a subquery to reference columns from tables listed before it in the FROM clause -> Option A
Quick Check:
LATERAL = subquery uses previous table columns [OK]

Quick Trick: LATERAL lets subqueries see earlier tables in FROM [OK]

Common Mistakes:

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