How to Accurately Calculate Business Days in Oracle SQL Without Using Functions or Procedures?

Calculate Business Days in Oracle SQL: Improved Formula without Functions or Procedures

Calculating business days between two dates in Oracle SQL is essential for a variety of business applications. Here's an enhanced approach to accomplish this without relying on built-in functions or procedures.

The previous code you provided faced occasional discrepancies in its calculations. To resolve this, consider the following modifications:

• Truncate the dates using TRUNC(CompleteDate) and TRUNC(InstallDate) to remove time components and focus solely on the business days.
• Calculate the weekday difference using (TRUNC(CompleteDate,'D'))-(TRUNC(InstallDate,'D')) and divide by 7 to account for weekends.
• Apply conditional logic to adjust for Sunday or Saturday being the start or end of the period, as they are not considered business days.

Here's the refined code:

SELECT OrderNumber, InstallDate, CompleteDate,
  (TRUNC(CompleteDate) - TRUNC(InstallDate) ) +1 - 
  ((((TRUNC(CompleteDate,'D'))-(TRUNC(InstallDate,'D')))/7)*2) -
  (CASE WHEN TO_CHAR(InstallDate,'DY','nls_date_language=english')='SUN' THEN 1 ELSE 0 END) -
  (CASE WHEN TO_CHAR(CompleteDate,'DY','nls_date_language=english')='SAT' THEN 1 ELSE 0 END) as BusinessDays
FROM Orders
ORDER BY OrderNumber;

This enhanced calculation should provide accurate business day results, aligning with Excel's NETWORKDAYS function.

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