How to Select Product Sales Data Within a Specific Date Range Using SQL?

Selecting Data from a Date Range Between Two Dates

Given a table named Product_Sales containing data on product sales, including Sold_by, Qty, From_date, and To_date, we seek a query to retrieve sales data within a specific date range. For instance, we aim to select data from January 3rd, 2013, to January 9th, 2013.

To begin, we observe that any date within the target range either intersects with the From_date and To_date of a row or lies entirely outside both boundaries. Therefore, we seek a query that returns rows that fulfill this condition.

One approach involves identifying all valid intervals (those where the target range overlaps with the row's interval) and excluding all invalid intervals. To this end, we can use the following query:

SELECT * FROM Product_Sales 
WHERE NOT (From_date > @RangeTill OR To_date <p>where @RangeTill is the upper bound of the target range (inclusive) and @RangeFrom is the lower bound (inclusive). This query leverages the fact that interval intersections in the non-excluded case will satisfy the following condition:</p>

• The target range does not extend beyond the row's From_date.
• The row's To_date does not extend beyond the target range.

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