Query to calculate business days

Question

i have table name order table . in that i have column name install date,order date.
the difference bet ween order date and install date should be greate than or equal to 3 working days.
fri and sat are holidays.
i need one query to find the difference betwwen orderdate and install date is greate than 3 working days

Answer 1

You can try like this
SQL> with order_tbl
  2  as
  3  (
  4    select to_date('01-jan-2013', 'dd-mon-yyyy') order_date
  5         , to_date('05-jan-2013', 'dd-mon-yyyy') installed_date
  6      from dual
  7    union all
  8    select to_date('04-jan-2013', 'dd-mon-yyyy') order_date
  9         , to_date('07-jan-2013', 'dd-mon-yyyy') installed_date
10      from dual
11    union all
12    select to_date('06-jan-2013', 'dd-mon-yyyy') order_date
13         , to_date('15-jan-2013', 'dd-mon-yyyy') installed_date
14      from dual
15    union all
16    select to_date('19-jan-2013', 'dd-mon-yyyy') order_date
17         , to_date('25-jan-2013', 'dd-mon-yyyy') installed_date
18      from dual
19    union all
20    select to_date('25-jan-2013', 'dd-mon-yyyy') order_date
21         , to_date('30-jan-2013', 'dd-mon-yyyy') installed_date
22      from dual
23  )
24  select order_date, installed_date, count(date_list) date_count
25    from (
26            select t.*, t.order_date + (level-1) date_list
27              from order_tbl t
28            connect by level <= installed_date - order_date + 1
29               and prior order_date = order_date
30               and prior sys_guid() is not null
31         )
32   where to_char(date_list, 'fmday') not in ('saturday', 'sunday')
33   group
34      by order_date, installed_date
35  /
ORDER_DAT INSTALLED DATE_COUNT
19-JAN-13 25-JAN-13          5
25-JAN-13 30-JAN-13          4
04-JAN-13 07-JAN-13          2
01-JAN-13 05-JAN-13          4
06-JAN-13 15-JAN-13          7
SQL> In the above code i have used the WITH clause to generate sample data. you can just use the SELECT query alone.