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

Calculating Business Days in Oracle SQL (Without Functions or Procedures)

While calculating business days between two dates in Oracle SQL using the formula:

((to_char(CompleteDate,'J') - to_char(InstallDate,'J')) 1) - (((to_char(CompleteDate,'WW') (52 ((to_char(CompleteDate,'YYYY') - to_char(InstallDate,'YYYY'))))) - to_char(InstallDate,'WW'))2)

may yield mostly accurate results, it occasionally deviates by 2 days or less. This inconsistency stems from disregarding the following factors:

• The formula assumes all months have 30 days, which is not true.
• It excludes weekends (Saturdays and Sundays).

To address these issues, a more accurate formula is:

(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)

Here, TRUNC() removes the time component from the dates, and TO_CHAR() extracts the weekday. The calculation now incorporates the number of days between the truncated dates, subtracts weekends, and adjusts for weekend start or end dates.

By incorporating these improvements, the formula accurately calculates business days, aligning with the NETWORKDAYS function in Excel.

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