midMySQL
Inner Join vs Left Join
Updated May 4, 2026
Short answer
Inner matches both; Left matches left plus nulls for right.
Deep explanation
Inner Join only returns rows with a match in both tables. Left Join returns all rows from the left table, regardless of a match in the right.
Real-world example
Finding all users and their orders, including those who have never placed an order.
Common mistakes
- Assuming Inner and Left joins are the same for large datasets.
Follow-up questions
- What is a Right Join?