Copying data from one row to another within the same table.

Question

0.00/5 (No votes)

See more:

HI i had a strange requirement (never seen before) where i need to update a row with one id to update a row with other id in same table let me explain i have a table like

ID   Name   Comm    Fees
1    abc    23.5     1.2
1    xyz    56.5     2.4
2    abc     2.3      62.95
2    xyz     4.3     11.89

so what i need to do here is i have to update the 1st ID Comm row with 2nd ID Fees row , is it possible to do a update values from the same table the output should look like

ID   Name   Comm    Fees
1    abc    62.95     1.2
1    xyz    11.89     2.4
2    abc     2.3      62.95
2    xyz     4.3     11.89

Thanks in advance

Posted 12-Apr-11 10:10am

makwith9789

Add a Solution

Comments

dan!sh 12-Apr-11 21:46pm

1. Do you want only the first row with name "abc" to be updated?
2. Do you want to do it for entire table or just some specific name which user will input?

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Wendelius · Accepted Answer · 2011-04-12T10:39:00

Solution 1

If the connecting column is Name then something like:

UPDATE MyTable
SET Comm = (SELECT Fees 
            FROM MyTable mt2
            WHERE mt2.Name = MyTable.Name
            AND mt2.Id != MyTable.Id)

However that fails if you have more than 2 rows with the same name so the condition in that case should be expanded.

Posted 12-Apr-11 10:39am

Wendelius

Comments

Espen Harlinn 12-Apr-11 16:47pm

Nice reply - 5ed!

Wendelius 12-Apr-11 16:59pm

Thanks, even though it isn't yet working :)

makwith9789 12-Apr-11 16:48pm

Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression.
The statement has been terminated.

eRROR I AM GETTING

Wendelius 12-Apr-11 16:58pm

This is what I warned about. So you have data like:
ID Name Comm Fees
1 abc 62.95 1.2
1 xyz 11.89 2.4
2 abc 2.3 62.95
2 xyz 4.3 11.89
3 abc 2.3 1.23
3 xyz 4.3 3.21

Q1: Now, should only the row with id 1 be updated?
Q2: Should id 1 row be updated with id2 row (with corresponding name) or with the sum of other rows?