update values of Null column between particular numbers

Question

1.00/5 (1 vote)

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I have column in my sql database named as S-No.
Which has values like following :

ID         S-No
____       ____
 1          1
____       ____
 2          2
____       ____
 3         Null
____       ____
 4         Null
____       ____
 5          3
____       ____
 6         Null
____       ____
 7         Null
____       ____
 8         Null
____       ____
 9         Null
____       ____
 10        Null
____       ____
 11         4
____       ____
 12        Null

.
.

Now, i want to write query in such a way that, which S-No column contains Null between 1 to 2, update there value to 1..... And which has Null between 2 To 3, update there value to 2... And so on... eg. 3 to 4 -- update as 3, 4 to 5 --- update as 4, 5 to 6...... I hope you will suggest me the query.. i am not able to write.. Frown | :( i hope you guyz will help.

Result Should be like this :

ID         S-No
____       ____
 1          1
____       ____
 2          2
____       ____
 3          2
____       ____
 4          2
____       ____
 5          3
____       ____
 6          3
____       ____
 7          3
____       ____
 8          3
____       ____
 9          3
____       ____
 10         3
____       ____
 11         4
____       ____
 12         4

.
.

Posted 19-Feb-15 7:56am

Harpreet_125

Updated 19-Feb-15 8:26am

PIEBALDconsult

v2

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PIEBALDconsult 19-Feb-15 14:26pm

Why didn't you simply add detail to your earlier question?
http://www.codeproject.com/Questions/878096/update-column-values-which-are-null?arn=0

2 solutions

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Madhu@sql · Answer 1 · 2015-02-22T19:42:00

begin

set nocount on

create table #temp
(
row_id int ,
row_value int

)

insert into #temp values(1,1)
insert into #temp values(2,2)
insert into #temp values(3,null)
insert into #temp values(4,null)
insert into #temp values(5,3)
insert into #temp values(6,null)
insert into #temp values(7,null)
insert into #temp values(8,null)
insert into #temp values(9,null)
insert into #temp values(10,null)
insert into #temp values(11,4)
insert into #temp values(12,null)

select * from #temp

declare @row_id int=0
declare @row_value int
declare @temp_row_value int

while(1=1)
begin

select top 1 @row_id=row_id,
@row_value=row_value
from #temp
where row_id>@row_id
order by row_id

if(@@ROWCOUNT=0)

begin
break
end

if @row_value is null
begin

update #temp
set row_value=@temp_row_value
where row_id=@row_id

end

else
begin
select @temp_row_value=@row_value
end

end

select * from #temp
drop table #temp

end

Wendelius · Answer 2 · 2015-02-19T08:00:00

Solution 1

You can try something like

SQL

UPDATE MyTableName a
SET [S-No] = (SELECT MAX([S-No])
              FROM MyTableName b
              WHERE b.Id < a.Id
              AND   b.[S-No] IS NOT NULL)
WHERE [S-No] IS NULL

Posted 19-Feb-15 8:00am

Wendelius

Comments

/\jmot 23-Feb-15 4:25am

The easy one. :) +5

Wendelius 23-Feb-15 14:13pm

Thank you !