Rownum in SQL Server

Prior to SQL Server 2005, there was no inherent function to generate a rownumber within a row. There is a workaround however for SQL 2000. If you are on SQL 2005+, then you will utilize the following function:

Method 1

-- SQL 2005+
    RowNumber = ROW_NUMBER() OVER (ORDER BY c.CustomerID ASC)
FROM SalesLT.Customer c

Method 2

There are two ways to do this in SQL 2000. The easiest way is to join the table on itself and count the number of rows that precede the primary key.

-- SQL 2000+
SELECT Rownum =
    FROM SalesLT.Customer
    WHERE CustomerID <= c.CustomerID
), *
FROM SalesLT.Customer c

Method 3

The other way for SQL 2000 is to use the IDENTITY function in order to generate a Rownum. The downside is that you must insert the results into a temp table, then select from the temp table in order to retrieve the rownum.

-- SQL 2000+
    RowNumber   = IDENTITY(INT,1,1)
INTO #Customer_RowID
FROM SalesLT.Customer c

FROM #Customer_RowID

Also notice from this example that when we insert the results into the temp table, we are specifying the column names. This is because the identity function will not work if you include the primary key of the table, which is another downside.

kashan 07 Apr 2012 at 3:29 pm

third one worked for me

rerrere 17 Jan 2012 at 1:03 am
Growan Technologies Pvt. Ltd. 27 Aug 2011 at 11:18 pm

Method 1 was quit easy and understandable helped me alot thanks for the post………

Rez 21 Mar 2011 at 11:01 pm

this isn’t clear.

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