Update column based on data from another column of same data

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SQL-Server-2008

Hi guys,
I have a table with column c1,c2 c3.
Here it is.

VB

c1  c2   c3
1   2   NULL
2   3   NULL
3   4   NULL
4   5   NULL

My requirement is that using a single update statement i need to fill the column c3 with c1 data.
Except the first row, the remaining columns need to be updated with data from column c1.

The desired output is:

VB

c1  c2  c3
1   2   NULL
2   3   1
3   4   2
4   5   3

Thanks in advance.

Posted 5-May-13 19:48pm

M S Chaitanya

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gvprabu 7-May-13 4:23am

C1, C2, C3 values are in same Ascending order like 1,2,3,4...
If its different u need to go for SUB Query and find the values for Each Data in C1 Columns then u ll do for Multiple Update (Update with Select Statement)

2 solutions

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Aarti Meswania · Answer 1 · 2013-05-05T19:53:00

Solution 1

if it's series then simply,

SQL

select c1,c2,case when (c1-1)=0 then NULL else (c1-1) end as C3
from tblnm

Happy Coding!
:)

Posted 5-May-13 19:53pm

Aarti Meswania

Comments

M S Chaitanya 6-May-13 1:57am

Thank u.. that was so simple..
but i asked for an update..

Aarti Meswania 6-May-13 1:58am

Welcome!
Glad to help you! :)

StianSandberg 6-May-13 2:23am

5'ed

Aarti Meswania 6-May-13 2:27am

Thank you! :)

_Damian S_ · Answer 2 · 2013-05-05T20:06:00

Solution 2

update TABLENAME
set c3 = c1
where c1 <> 1

Edit:
Scratch that... I answered your actual question rather than what you showed in your sample data.

Posted 5-May-13 20:06pm

_Damian S_

Updated 5-May-13 20:08pm

v2