TSQL query (how to update next row from previous row)

Question

1.00/5 (2 votes)

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Hi guys,

I have a table like this :

Id Name Code
1 A Null
2 B 12
3 C Null
4 D Null
5 E Null
6 F 45
7 G 67
8 H Null
9 I Null
10 J 8

I want a result like this
Id Name Code
1 A 0
2 B 12
3 C 12
4 D 12
5 E 12
6 F 45
7 G 67
8 H 67
9 I 67
10 J 8

That means I need to update CODE with previous value if not than 0 like row 1.

Thanx in advance

Need Urgently

Posted 15-Oct-13 19:08pm

rakesh@bbspl.com

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ArunRajendra · Answer 1 · 2013-10-16T19:55:00

Solution 4

Hello. Try this code. Replace @a with your table name.

SQL

declare @b table
(
id int,
newcode int
)


declare @prev int


insert into @b(id,newcode) select  id,code from @a
 order by id desc

 set @prev = 0

 update @b
 set @prev=ISNULL(newcode,@prev),
 newcode=@prev
  from @b

 select a.id,a.name,b.newcode 
 from @a a inner join @b b on a.id = b.id

Posted 16-Oct-13 19:55pm

ArunRajendra

Updated 16-Oct-13 19:56pm

v2

Comments

JigneshSurati 30-Jan-20 4:48am

Somehow came to this blog.

My problem was difference like calculate Open, +, -, Close.

By joining with LEFT JOIN, got current row & previous row, then calculated with setting first into variables and then updating physical records.

This solved my problem!

Even "LAG" and "Recursive query with CTE" failed.

But this worked for me!.

RedDk · Answer 2 · 2013-10-16T07:35:00

Solution 2

Does this work?

SELECT a.Id, a.Name, a.Code, (
    SELECT SUM(b.Code)
        FROM [table] b
           WHERE b.Id <= a.Id
     )
     FROM [table] a
       ORDER BY a.Id

Posted 16-Oct-13 7:35am

RedDk

Comments

rakesh@bbspl.com 17-Oct-13 0:32am

Thanks for the reply, but it will not fulfill the requirement. This only gives the SUM from least to upper.
I need to overwrite null values from last existing value.

VeeraAnnapureddy · Answer 3 · 2013-10-16T19:04:00

Solution 3

SQL

Select  Id
      , Name
      , Code
      , (Select Case When a.code <> 0 Then A.Code Else Sum(b.Code) End
        From TableName as b
        Where b.Id < a.Id) AS Code1 
        From TableName As a

Posted 16-Oct-13 19:04pm

VeeraAnnapureddy