[Solved] What is a key risk when using NATURAL JOIN in PostgreSQL? — Ans: It automatically joins tables on all columns with the same name, which may... | PostgreSQL

PostgreSQL - Joins in PostgreSQL

What is a key risk when using NATURAL JOIN in PostgreSQL?

AIt requires explicit join conditions to work properly.

BIt automatically joins tables on all columns with the same name, which may cause unexpected results.

CIt only works with numeric columns.

DIt creates duplicate rows regardless of matching columns.

Step-by-Step Solution

Solution:

Step 1: Understand how NATURAL JOIN works
NATURAL JOIN automatically matches columns with the same name in both tables.
Step 2: Identify the risk of automatic matching
This can cause unexpected joins if tables share column names that are not intended to be join keys.
Final Answer:
It automatically joins tables on all columns with the same name, which may cause unexpected results. -> Option B
Quick Check:
NATURAL JOIN risk = Automatic matching [OK]

Quick Trick: NATURAL JOIN matches all same-named columns automatically [OK]

Common Mistakes:

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What is a key risk when using NATURAL JOIN in PostgreSQL?