Question

I have a date column in a table and I want to get week number for that particular date based on the month from that date irrespective of the day

For example:

01-dec-2012 to 07-dec-2012 should give week number as 1
08-dec-2012 to 14-dec-2012 should give week number as 2
15-dec-2012 to 21-dec-2012 should give week number as 3
22-dec-2012 to 28-dec-2012 should give week number as 4
29-dec-2012 to 31-dec-2012 should give week number as 5

This week number is not dependent on the starting day of the week i.e, it can be any day

How can I write a select statement to get this output in SQL Server 2008?

Answer 1

You can use DAY (Transact-SQL)

select ((day(DateColumn)-1) / 7) + 1
from YourTable

SQL Fiddle

MS SQL Server 2012 Schema Setup:

create table YourTable
(
  D datetime
)

insert into YourTable 
select getdate()+Number
from master..spt_values
where type = 'P' and
      Number between 1 and 15

Query 1:

select D,
       ((day(D)-1) / 7) + 1 as W
from YourTable

Results:

|                              D | W |
--------------------------------------
| January, 03 2013 07:48:54+0000 | 1 |
| January, 04 2013 07:48:54+0000 | 1 |
| January, 05 2013 07:48:54+0000 | 1 |
| January, 06 2013 07:48:54+0000 | 1 |
| January, 07 2013 07:48:54+0000 | 1 |
| January, 08 2013 07:48:54+0000 | 2 |
| January, 09 2013 07:48:54+0000 | 2 |
| January, 10 2013 07:48:54+0000 | 2 |
| January, 11 2013 07:48:54+0000 | 2 |
| January, 12 2013 07:48:54+0000 | 2 |
| January, 13 2013 07:48:54+0000 | 2 |
| January, 14 2013 07:48:54+0000 | 2 |
| January, 15 2013 07:48:54+0000 | 3 |
| January, 16 2013 07:48:54+0000 | 3 |
| January, 17 2013 07:48:54+0000 | 3 |