[Solved] Given tables orders (1000 rows) and customers (10 rows), which join order is likely faster?Query 1: SELECT * FROM orders JOIN customers ON orders.customer_id = customers.id;Query 2:... | SQL

SQL - Advanced Joins

Given tables orders (1000 rows) and customers (10 rows), which join order is likely faster?
Query 1: SELECT * FROM orders JOIN customers ON orders.customer_id = customers.id;
Query 2: SELECT * FROM customers JOIN orders ON customers.id = orders.customer_id;

AQuery 1 is faster because orders is first.

BQuery 2 is faster because customers is first and smaller.

CBoth queries have the same speed always.

DQuery 2 will cause an error due to join order.

Step-by-Step Solution

Solution:

Step 1: Analyze table sizes and join order
Joining smaller tables first often helps performance because fewer rows are processed early.
Step 2: Compare queries
Query 2 starts with the smaller customers table (10 rows), likely reducing intermediate data size and speeding up join.
Final Answer:
Query 2 is faster because customers is first and smaller. -> Option B
Quick Check:
Smaller table first improves speed [OK]

Quick Trick: Join smaller tables first for better speed [OK]

Common Mistakes:

MISTAKES

Assuming join order never affects speed
Thinking larger table first is always better
Believing join order causes errors

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More SQL Quizzes

Given tables orders (1000 rows) and customers (10 rows), which join order is likely faster?

Step 1: Analyze table sizes and join order

Step 2: Compare queries

Final Answer:

Quick Check:

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