Customer Orders
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Write a query to identify customers who placed more than three transactions each in both 2019 and 2020.
Example:
Input:
transactions table
| Column | Type |
|---|---|
id |
INTEGER |
user_id |
INTEGER |
created_at |
DATETIME |
product_id |
INTEGER |
quantity |
INTEGER |
users table
| Column | Type |
|---|---|
id |
INTEGER |
name |
VARCHAR |
Output:
| Column | Type |
|---|---|
customer_name |
VARCHAR |
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