Auto generate ID number

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Auto generate ID number as yyyynnnn where ‘yyyy’ is current calendar year and ‘nnnn’ is the next ID serial number for the calendar year.
e.g. 20200001
Note: ‘nnnn’ serial number should start with 1 when calendar year changes.

What I have tried:

Auto generate ID number as yyyynnnn where ‘yyyy’ is current calendar year and ‘nnnn’ is the next ID serial number for the calendar year.
e.g. 20200001
Note: ‘nnnn’ serial number should start with 1 when calendar year changes.

Posted 8-Sep-20 19:51pm

Member 14573784

Updated 8-Sep-20 20:37pm

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Maciej Los 9-Sep-20 2:21am

What have you tried so far? Where did you stuck?

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OriginalGriff · Answer 1 · 2020-09-08T20:31:00

Set up an IDENTITY field to autoincrement and provide a unique value per row.
Then set up a Computed Column[^] which generates your year based ID.
Generate your table with three columns:
ID (INT, IDENTITY)
InsDate (DATE)
YearID (NVARCHAR(8)
Create a scalar function:

SQL

CREATE FUNCTION [dbo].[fnGetYearID] 
(
	@DT DATE
)
RETURNS NVARCHAR(8)
AS
BEGIN
	DECLARE @Result NVARCHAR(8)
    SET @Result = cast(year(@DT) as varchar) + (SELECT RIGHT('0000' + CAST(COUNT(*) AS NVARCHAR(4)), 4) FROM MyTable WHERE YEAR(InsDate) = YEAR(@DT))
	RETURN @Result

END

Change the design of your table to make the YearID column a computed column, with the Computed Column Specification set to:

([dbo].[fnGetYearID]([InsDate]))

Now try adding a column with a date and no other data.

Jignesh Khant · Answer 2 · 2020-09-08T20:38:00

int year = date.Year;
int MonthPart = date.Month;
int dayPart = date.Day;
int OrderNo = 000;
string ON = "";
var lstData = dbEntities.TableName.OrderByDescending(company => company.ModifiedDate).Take(1).ToList();

if (lstData != null && lstData.Count() > 0 && MonthPart != 01 && dayPart != 01)
            {
                foreach (var item in lstData)
                {
                    ON = item.TestOrderNo.ToString().Substring(item.TestOrderNo.ToString().Length - 3);
                    OrderNo = int.Parse(ON) + 1;
                }
            }
            else
            {
                OrderNo = 001;
            }
TON = YearPart + "-" + OrderNo.ToString().PadLeft(3, '0');

Auto generate ID number

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