🌿 NATURAL JOIN in SQL

Last Updated: January 2026

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A NATURAL JOIN automatically joins two tables using columns with the same name and compatible data types.

👉 You do not write the ON condition — SQL figures it out.

• SQL looks for common column names
• Uses them as join condition automatically
• Removes duplicate join columns from output

Hinglish Tip 🗣: Jab dono tables me same column name ho aur condition khud SQL lagaye → NATURAL JOIN.

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🧾 Basic Syntax

SELECT columns
FROM table1
NATURAL JOIN table2;

Note: No ON, no USING.

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📄 Example Tables

students

student_id	name
1	Rahul
2	Anjali
3	Aman

enrollments

student_id	course
1	SQL
3	Python
4	Java

📄 NATURAL JOIN Example

SELECT students.name, enrollments.course
FROM students
NATURAL JOIN enrollments;

SQL internally treats it as:

ON students.student_id = enrollments.student_id

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⚠️ Hidden Danger of NATURAL JOIN

• If new column with same name is added later
• Join logic changes automatically
• Query may silently break

Hinglish Tip 🗣: Production me NATURAL JOIN risky hota hai — kyunki condition hidden hoti hai.

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