[Solved] Which statement best describes the performance difference between a JOIN and a subquery in SQL? — Ans: JOINs generally perform better because they combine tables in a single step. | SQL

SQL - Subqueries

Which statement best describes the performance difference between a JOIN and a subquery in SQL?

AJOINs generally perform better because they combine tables in a single step.

BSubqueries always perform better because they run separately.

CJOINs and subqueries have the same performance in all cases.

DSubqueries are faster because they use less memory.

Step-by-Step Solution

Solution:

Step 1: Understand how JOINs work
JOINs combine rows from two or more tables in one operation, which is often optimized by the database engine.
Step 2: Compare with subqueries
Subqueries run separately and then feed results to the main query, which can be slower especially with large data.
Final Answer:
JOINs generally perform better because they combine tables in a single step. -> Option A
Quick Check:
JOIN performance > Subquery performance [OK]

Quick Trick: JOINs usually run faster than subqueries [OK]

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Which statement best describes the performance difference between a JOIN and a subquery in SQL?