Numbering system in Sql Server

Question

hi
i am using sql server 2008 & vs 2008 C#
i have table
[tbl_CashCounter](
[Id] [int] IDENTITY(1,1) NOT NULL,
[BillNo] [nvarchar](50) NULL,
[BillDate] [datetime] NULL
i want BillNo  A0001,A0002,..........A9999.
if it reached A9999 it should new series like  B0001,B0002,..........B9999.
then C,D,.........Z
i am looking sql function or store procedure which will return max  Series No.
i want use like this
txtBillNo.text =  getMaxNo();
Thanks Best Regard Naweez

Answer 1

As per your scenario, below the code is working fine as well as good performance. Code was tested in SQL SERVER 2008 R2.
CREATE FUNCTION getMaxNo()
RETURNS VARCHAR(5)
AS
BEGIN
DECLARE @Max_no varchar(5), @numeric int
SELECT @Max_no= ISNULL(MAX(BillNo),'A0001') FROM [tbl_CashCounter]
SET @numeric=CAST(RIGHT(@Max_no,4) AS INT)+1
SELECT @Max_no=(CASE WHEN RIGHT(@Max_no,4)=9999 THEN char(ASCII(left(@Max_no,1))+1)+'0001'
ELSE left(@Max_no,1) END)
+''+
ISNULL(CASE WHEN len(@numeric)=1 THEN '000'+CAST(CAST(RIGHT(@Max_no,4) AS INT)+1 AS VARCHAR(4))
WHEN len(@numeric)=2 THEN '00'+CAST(CAST(RIGHT(@Max_no,4) AS INT)+1 AS VARCHAR(4))
WHEN len(@numeric)=3 THEN '0'+CAST(CAST(RIGHT(@Max_no,4) AS INT)+1 AS VARCHAR(4))
WHEN len(@numeric)=4 THEN ''+CAST(CAST(RIGHT(@Max_no,4) AS INT)+1 AS VARCHAR(4))
END,'')
RETURN @Max_no
END
GO
Regards,
RAMBHARATH
thanks its working fine i just modified
alter FUNCTION getMaxNo()
RETURNS VARCHAR(5)
AS
BEGIN
DECLARE @Max_no varchar(5), @numeric int
SELECT @Max_no= ISNULL(MAX(BillNo),'A0001') FROM [tbl_CashCounter]
SET @numeric=CAST(RIGHT(@Max_no,4) AS INT)+1
SELECT @Max_no=
(CASE WHEN RIGHT(@Max_no,4)=9999 THEN char(ASCII(left(@Max_no,1))+1)+'0001'
ELSE left(@Max_no,1)
END)
+''+ ISNULL( replicate('0', 4 - len(@numeric)) + CAST(CAST(RIGHT(@Max_no,4) AS INT)+1 AS VARCHAR(4)),'')
RETURN @Max_no
END
GO
Thanks Best Regard Naweez