Tip

Calculating the number of working days in a month with SQL

There is a simple way in SQL to calculate the number of working days in a given month and year. This code can also pick up the holidays (like the 4th July) using a HOLIDAY table and then substract them to give the actual number of working days in a particular month and year. Here it is:

                
Set feedback off echo off autop off ver off 
ALTER SESSION SET NLS_DATE_FORMAT='DD-MON-YYYY'; 
accept MONTH char format 'A3'- 
prompt'Enter MONTH for which U want the number of working days (like JAN..):' 
accept YEAR char format 'A4'- 
prompt'Enter the 4 digit Year (like 1999...):' 
select count(*) NUM_WORK_DAYS 
from ( 
select to_date( '01-&MONTH-&YEAR', 'dd-mon-yyyy' )+rownum-1 day 
from all_objects 
where rownum < to_number( to_char( last_day( '01-&MONTH-&YEAR' ),'DD' ) )+1) 
where to_number(to_char(day,'d')) between 2 and 6 
and not exists ( select NULL 
from HOLIDAY 
where HOLIDAY.actdate =day ) 
/ 

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This was first published in October 2001

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