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Editorial Team
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Asked: 2026-06-14T12:01:17+00:00

Possible Duplicate: How do I generate random number for each row in a TSQL

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Possible Duplicate:
How do I generate random number for each row in a TSQL Select?

I am importing excel sheet into sql database, db table has the following columns:
srno | passportnumber|flightnumber

now when i import excel sheet the srno stays NULL after importing. Now i need this Srno column to be updated using sql query such that it has a random number or non-random serial number but it should have same srno value where the passport number is same i mean:
If passportnumber abc123 occurs 4 times each time the srno must have same value for eg :

srno | passportnumber|flightnumber
12   | ab32434       |AI-2011
13   | ab565235      |AI-2562
14   | ABC123        |AI-2025
14   | ABC123        |AI-2000
14   | ABC123        |AI-5623
15   |XYZ12334       |AI-5625
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1 Answer

  1. Editorial Team
    with cte as (
  select DENSE_RANK() OVER (ORDER BY passportnumber) as rank,
    srno
  from table)
update cte
  set srno = rank;

    This will give serial numbers in order of passport. Modifying this to give truly random numbers based on a lookup dictionary preloaded with the randoms is trivial and I leave it as an exercise.

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