diff --git a/database/notes/06-sql-joins-aggregation.md b/database/notes/06-sql-joins-aggregation.md
index 3e7be8e..a400ac6 100644
--- a/database/notes/06-sql-joins-aggregation.md
+++ b/database/notes/06-sql-joins-aggregation.md
@@ -324,7 +324,7 @@ HAVING AVG(iq) >= 100;
 2. [Simple - II](https://leetcode.com/problems/find-customer-referee//)
 3. [Joins - I](https://leetcode.com/problems/employees-earning-more-than-their-managers/)
 4. [Joins - II](https://leetcode.com/problems/combine-two-tables/)
-5. [Aggregation - I](https://leetcode.com/problems/duplicate-emails/)
-6. [Join - III](https://leetcode.com/problems/delete-duplicate-emails/)
+5. [Join - III](https://leetcode.com/problems/delete-duplicate-emails/)
+6. [Aggregation - I](https://leetcode.com/problems/duplicate-emails/)
 7. [Aggregation - II](https://leetcode.com/problems/customer-placing-the-largest-number-of-orders/)
 8.  [Aggregation - III](https://leetcode.com/problems/classes-more-than-5-students/)