How to update certain records (or a range of records) in specific column of a table in SQL Server using While Loop?

Question

Suppose I have a table with columns Id and TransactionNo .

The Id column has a range of ids starting from 1 to 3000.

What I need to do is to update the TransactionNo column for the id's ranging from 1000 to 2000.

In other words, TransactionNo must be updated only for Id in a range of 1000 to 2000 incrementing by one (++1) for each Id upwards.

Since it is a tedious job, I am looking for a while loop solution to update all TransactionNo in this range of Ids.

Answer 1

In case there are gaps in your id sequence and you want a continuous sequence for your generated column you could use row_number() like shown here:

update t set trn=rn from
  (select trn,row_number()
   over (order by id) rn
   from t1
   where id>=1000 and id<=2000) t

Demo

Answer 2

try like below

update table
 set TransactionNo=id-1000
  where id>1000 and id<=2000

Demo link

Answer 3

I think you are looking for following query.

UPDATE table 
SET    transactionno = transactionno + 1 
WHERE  id >= 1000 
       AND id <= 2000 

Answer 4

I think you need this:

update tablename
set transactionno = (select transactionno from tablename where id = 1000) + id - 1000
where id > 1000 and id <= 2000

it keeps the transactionno of id = 1000 and increments the rest by 1 from id = 1001 to id = 2000 .
See the demo

Or with a CTE:

with cte as (
  select transactionno from tablename where id = 1000
)
update tablename
set transactionno = (select transactionno from cte) + id - 1000
where id > 1000 and id <= 2000

See the demo

Answer 5

declare @startID = 1000
while(@startID <= 2000)
begin
   update table set TransactionNo = value where Id = @startID;
   set @StartID += 1;
end

Answer 6

Try This:

UPDATE TableName
SET TransactionNo = Id
WHERE Id BETWEEN 1000 AND 2000

Note: you can change this assignment statement (ie = Id ) with whatever the value you want.