November 21, 2024
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How to Create a Unique Number in SQL Server?

Craig Johnson02 mins

To create a unique number in SQL Server, you can use various techniques depending on your requirements. Here are a few approaches you can consider.hfl-new-banner

Identity Column

    • The simplest way is to use an identity column. It automatically generates a unique number for each row inserted into a table.
    • Here’s an example
CREATE TABLE YourTable (
    ID INT IDENTITY(1,1) PRIMARY KEY,
	VCH_USER_NAME VARCHAR(150)
    -- Other columns
)

UUID (Universally Unique Identifier)

  • If you need globally unique identifiers, you can use the NEWID() function to generate a unique identifier for each row.
  • Here’s an example:
  • CREATE TABLE YourTable (
    ID UNIQUEIDENTIFIER DEFAULT NEWID() PRIMARY KEY,
	VCH_NAME VARCHAR(150)
    -- Other columns
)

Output

The NEWID() function generates a unique identifier value for each new row inserted.

User Definer Unique Code as below

declare @vch_UniqueRefNo varchar(30)='',@slno int=0
select @slno=count(int_req_payment_id) from T_COP_REQUEST_PAYMENTS where convert(date,dt_PaymentDate)=convert(date,getdate());
set @slno = @slno + 1;
set @vch_UniqueRefNo= convert(varchar,year(GETDATE()))+format(month(GETDATE()),'00')+format(day(GETDATE()),'00')+format(@slno,'0000')
select @vch_UniqueRefNo

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