[Solved] Given tables products (10000 rows) and categories (10 rows), which join order is likely to run faster?Query 1: SELECT * FROM products JOIN categories ON products.cat_id = categories.id;Query 2:... | SQL

SQL - Advanced Joins

Given tables products (10000 rows) and categories (10 rows), which join order is likely to run faster?

Query 1: SELECT * FROM products JOIN categories ON products.cat_id = categories.id;
Query 2: SELECT * FROM categories JOIN products ON products.cat_id = categories.id;

AQuery 1 is faster because it starts with the large table

BQuery 2 is faster because it starts with the small table

CBoth queries have the same performance

DNeither query will run due to syntax errors

Step-by-Step Solution

Solution:

Step 1: Analyze join order impact
Starting with the large table allows filtering early and reduces rows processed in join.
Step 2: Compare queries
Query 1 starts with products (large), Query 2 starts with categories (small). Query 1 is more efficient.
Final Answer:
Query 1 is faster because it starts with the large table -> Option A
Quick Check:
Large table first improves performance [OK]

Quick Trick: Join large tables first to improve speed [OK]

Common Mistakes:

MISTAKES

Assuming small table first is always faster
Ignoring table size in join order
Confusing syntax errors with performance issues

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More SQL Quizzes

Given tables products (10000 rows) and categories (10 rows), which join order is likely to run faster?

Step 1: Analyze join order impact

Step 2: Compare queries

Final Answer:

Quick Check:

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