CODEWITHSUNDEEP
sqloracle-databasedateoracle11g
faujong
faujong

Reputation: 1129

Oracle query to get the number of business days between 2 dates, excluding holidays

We are using Oracle 11.

In our CASE WHEN statement, I need to check if the number of days between the 2 dates are > 3 business days (so excluding weekends and holidays).

    CASE WHEN end_date - start_date > 3  THEN 0  --> this includes weekend 
        and holidays
WHEN CODE = 1 THEN 1
WHEN CODE =2 THEN 2
ELSE 3
END AS MyColumn

Say I have a holiday calendar table that has column HolidayDates that contains all the holidays, for ex: 12/25/2018, 12/31/2018, etc.

HolidayDates
12/25/2018
12/31/2018

So, if

Date1 = 1/2/19 (Wednesday)

Date2 = 12/27/18 (Thursday)

The number of business days in between Date1 and Date2 is 3 days (12/27, 12/28 and 12/31).

The below query will get the number of business days excluding weekends.

How do I also exclude holidays in this query ?

SELECT TO_CHAR( start_date, 'YYYY-MM-DD "("DY")"') AS start_date,

   ( TRUNC( end_date, 'IW' ) - TRUNC( start_date, 'IW' ) ) * 5 / 7
   + LEAST( TRUNC( end_date   ) - TRUNC( end_date,   'IW' ) + 1, 5 )
   - LEAST( TRUNC( start_date ) - TRUNC( start_date, 'IW' ), 5 )
     AS Num_Week_Days
FROM   table_name;

Thank you.

Upvotes: 1

Views: 863

Answers (1)

MT0
MT0

Reputation: 168720

Taking the code in this previous answer and converting it from a function to a query gives:

Oracle Setup:

CREATE TABLE Holidays ( HolidayDates ) AS
SELECT DATE '2018-12-25' FROM DUAL UNION ALL
SELECT DATE '2018-12-31' FROM DUAL;

CREATE TABLE table_name ( start_date, end_date ) AS
SELECT DATE '2018-12-21', DATE '2018-12-26' FROM DUAL UNION ALL
SELECT DATE '2018-12-28', DATE '2019-01-01' FROM DUAL;

Query:

SELECT t.*,
       ( TRUNC( end_date, 'IW' ) - TRUNC( start_date, 'IW' ) ) * 5 / 7
       + LEAST( TRUNC( end_date   ) - TRUNC( end_date,   'IW' ) + 1, 5 )
       - LEAST( TRUNC( start_date ) - TRUNC( start_date, 'IW' ), 5 )
       - ( SELECT COUNT(1)
           FROM   holidays
           WHERE  HolidayDates BETWEEN t.start_date AND t.end_date
           -- Exclude any weekend holidays so we don't double count.
           AND    TRUNC( HolidayDates ) - TRUNC( HolidayDates, 'IW' ) <= 5
         )
       AS Num_Week_Days
FROM   table_name t;

Output:

START_DATE | END_DATE  | NUM_WEEK_DAYS
:--------- | :-------- | ------------:
21-DEC-18  | 26-DEC-18 |             3
28-DEC-18  | 01-JAN-19 |             2
01-JAN-19  | 07-JAN-19 |             5

db<>fiddle here

Upvotes: 0

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