[Solved] What does a CROSS JOIN do in PostgreSQL? — Ans: Pairs every row from the first table with every row from the second table. | PostgreSQL

PostgreSQL - Joins in PostgreSQL

What does a CROSS JOIN do in PostgreSQL?

APairs every row from the first table with every row from the second table.

BReturns only matching rows based on a condition.

CJoins tables based on a common column with duplicates removed.

DFilters rows from the first table that exist in the second table.

Step-by-Step Solution

Solution:

Step 1: Understand CROSS JOIN concept
A CROSS JOIN creates combinations of all rows from both tables without any condition.
Step 2: Compare with other JOIN types
Unlike INNER JOIN or LEFT JOIN, CROSS JOIN does not filter or match rows but pairs all possible combinations.
Final Answer:
Pairs every row from the first table with every row from the second table. -> Option A
Quick Check:
CROSS JOIN = all combinations [OK]

Quick Trick: Remember: CROSS JOIN multiplies rows from both tables [OK]

Common Mistakes:

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What does a CROSS JOIN do in PostgreSQL?