[Solved] In PostgreSQL, what unique capability does a LATERAL join provide when used in a query? — Ans: It allows a subquery in the FROM clause to reference columns from preceding... | PostgreSQL

PostgreSQL - Joins in PostgreSQL

In PostgreSQL, what unique capability does a LATERAL join provide when used in a query?

AIt enables joining tables without specifying any join condition.

BIt automatically creates indexes on joined tables for faster query execution.

CIt allows a subquery in the FROM clause to reference columns from preceding tables in the same FROM clause.

DIt restricts the join to only return rows where the join condition is NULL.

Step-by-Step Solution

Solution:

Step 1: Understand LATERAL join behavior
A LATERAL join allows a subquery in the FROM clause to access columns from tables that appear earlier in the FROM list.
Step 2: Analyze options
It allows a subquery in the FROM clause to reference columns from preceding tables in the same FROM clause. correctly describes this unique feature. Options B, C, and D describe unrelated or incorrect behaviors.
Final Answer:
It allows a subquery in the FROM clause to reference columns from preceding tables in the same FROM clause. -> Option C
Quick Check:
Does LATERAL enable referencing prior tables in FROM? Yes. [OK]

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

Common Mistakes:

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In PostgreSQL, what unique capability does a LATERAL join provide when used in a query?