SQL Query for Calculating Running Totals Over Specific Time Frame

Query to Calculate Running Totals Over a Specific Time Frame Using Window Functions

SELECT
    OrderDate,
    OrderAmount,
    SUM(OrderAmount) OVER (ORDER BY OrderDate ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS RunningTotal
FROM
    Orders
WHERE
    OrderDate BETWEEN 'start_date' AND 'end_date'
ORDER BY
    OrderDate;

Annotations:

1. The query selects the columns OrderDate and OrderAmount from the Orders table.

2. The SUM function along with the OVER clause is used to calculate the running total of OrderAmount over a specific time frame.

3. OVER (ORDER BY OrderDate ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) defines the window frame for the running total. It includes all rows from the beginning of the partition up to the current row.

4. The WHERE clause filters the data based on the specified time frame with start_date and end_date.

5. The running total is calculated and presented in the result as RunningTotal.

6. The final result is ordered by OrderDate.

7. This query efficiently utilizes window functions to compute running totals over a specific time frame, adding valuable insights to the data analysis process.