Average Quantity
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Given a table of transactions, write a query to find the average quantity of each product purchased per transaction each year.
The output should include the year, product_id, and average quantity of the product purchased per transaction that year. The output table should be sorted by year and product_id in ascending order. The value for avg_quantity should be rounded to two decimal places.
Example:
Input:
transactions table
| Columns | Type |
|---|---|
id |
INTEGER |
user_id |
INTEGER |
created_at |
DATETIME |
product_id |
INTEGER |
quantity |
INTEGER |
Output:
| Columns | Type |
|---|---|
year |
INTEGER |
product_id |
INTEGER |
avg_quantity |
DECIMAL |
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