Monthly Product Sales
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Given a table containing data for monthly sales, write a query to find the total amount of each product sold for each month with each product as its own column in the output table.
Example:
Input:
monthly_sales table
month |
product_id |
amount_sold |
|---|---|---|
| 2021-01-01 | 1 | 100 |
| 2021-01-01 | 2 | 300 |
| 2021-02-01 | 3 | 200 |
| 2021-03-01 | 4 | 250 |
Output:
| month | 1 | 2 | 3 | 4 |
|---|---|---|---|---|
| 2021-01-01 | 100 | 0 | 300 | 0 |
| 2021-02-01 | 0 | 200 | 0 | 0 |
| 2021-03-01 | 0 | 0 | 0 | 250 |
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