Question

is it possible to create a per month identity ?
basically what I need is

create table
(
id identity primary key
regDate DateTime not null,
regDateNumber int not null
)

and when I insert data I need set the regDateNumber as an identity in the scope of the regDate’s month

like this:

id   regDate    regDateNumber
1    1 jan 2008 1
2    3 jan 2008 2
3    7 jan 2008 3
4    1 feb 2008 1
5    1 feb 2008 2
6    1 aug 2008 1
7    1 aug 2008 2
8    1 sep 2008 1
9    1 sep 2008 2

Answer 1

I believe you can achieve this by using a stored procedure:

CREATE PROCEDURE month_indentity
   @myInput  DateTime
AS
SELECT COUNT(*) + 1 FROM mytable
WHERE MONTH(regDate) = MONTH(@myInput)
    AND YEAR(regDate) = YEAR(@myInput)
GO