给出一个交易表,列 TransactionID, ProductID, Quantity, 和 Price,写一个 SQL 查询,以找到每个产品的总收入.
Here’s a SQL query that you can use to find the total revenue for each product:

```
SELECT ProductID, SUM(Quantity * Price) AS TotalRevenue
FROM transactions
GROUP BY ProductID;
```

This query will group transactions by ProductID and calculate the total revenue for each product by multiplying the quantity and price columns and summing them up. The result will have two columns: ProductID and TotalRevenue.