Calculate Hours Based on Business Hours in Oracle SQL

Calculating the duration of a task based on business hours is a common requirement in workforce management systems. The standard formula to calculate the number of hours between a start and end time would not incorporate business hours, potentially resulting in overstated hours. To address this, we can leverage Oracle SQL's robust date and time manipulation capabilities to adjust the calculation based on specified business hours.

The provided sample data contains task information, start times, and end times. The task is to compute the duration of each task considering the business hours, which are Monday through Saturday from 8:00 AM to 6:00 PM.

One approach involves utilizing a correlated hierarchical query to generate separate work days and then sum up the hours for each day. The query generates a separate row for each potential workday for each task. It then calculates the start time of the workday by determining the later time between the task's start time and 8:00 AM on that day. The end time is similarly calculated, using the lower of the task's end time and 6:00 PM on that day.

Once the start and end times for each workday have been determined, the total number of hours can be calculated by subtracting the start time from the end time. The daily hours are then summed up to arrive at the total hours spent on each task.

An alternative solution is to use a formula that directly accounts for the business hours. This formula considers several aspects:

The difference between the start of ISO weeks (which represents the number of complete weeks) multiplied by the number of available hours per week (10 hours * 6 days).
The number of full days in the final week by calculating the difference between the end of the week and the last week's end.
The number of days before the start date by finding the difference between the start of the week and the start date.
The number of business hours on the final day, which is the lower of the difference between the end time and the end of the workday or 10 hours.
The number of hours on the day before the range starts, again using the lower of the difference between the start time and the start of the workday or 10 hours.

Multiplying this formula by 24 converts it into minutes and then dividing it by 15 gives the number of business hours.

Both solutions effectively calculate the duration of tasks based on the specified business hours, ensuring accurate tracking and reporting of time spent on tasks. The choice between the two approaches depends on factors such as dataset size, performance considerations, and specific business requirements.

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