How to copy/move a column from one table to another in SQL?

Question

0.00/5 (No votes)

See more:

Hi,

I have a couple of tables in my database.
I want to copy/move column Msk709 from table RD11 to table RD21.
I tried the following:

C#

"INSERT INTO RD21 (Msk709) SELECT RD11.Msk709 FROM RD11"

I get the following error:
Invalid column name 'Msk709'

Next try, I tried to make the column:

C#

"ALTER TABLE RD21 ADD Msk709 NVARCHAR(5) ";

and after that:

SQL

"INSERT INTO RD21 (Msk709) SELECT RD11.Msk709 FROM RD11"

I get the error:
Cannot insert the value NULL into column 'AnställningsNummer', table 'KompetensMatris.dbo.RD21'; column does not allow nulls. INSERT fails.
The statement has been terminated.

In the RD21 table I have the following columns:

AnställningsNummer, Msk100, Msk201, Msk710

Am I missing something?
Can someone point me to the right direction?

Vidor

Posted 13-May-13 20:48pm

Vidor

Add a Solution

2 solutions

Solution 1

I think you just need to change your new column to allow nulls (as there are obviously some nulls in the source table)

ALTER TABLE RD21 ADD Msk709 NVARCHAR(5) NULL

Posted 13-May-13 20:53pm

_Maxxx_

Comments

[no name] 14-May-13 3:36am

I get the same error:
Cannot insert the value NULL into column 'AnställningsNummer', table 'KompetensMatris.dbo.RD21'; column does not allow nulls. INSERT fails.
The statement has been terminated.

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)

Vidor · Accepted Answer · 2013-05-14T01:04:00

I managed to solve the problem:

First

string alterSQL = "ALTER TABLE <totable> ADD <column> NVARCHAR(5) ";

Now comes the update

string qryMove ="UPDATE <totable> SET <column> = (SELECT <column> FROM <fromtable> WHERE <fromtable.keycolumn> = <totable.keycolumn>)";

After update I can remove the old column från the table:

string strDelColumn = "ALTER TABLE <fromtable> DROP COLUMN <column>;

Execute the SQL queries

Functions Execute = new Functions();
Execute.MySqlCommand(alterSQL, connCopy);
Execute.MySqlCommand(qryMove, connCopy);
Execute.MySqlCommand(strDelColumn, connCopy);

That's all.

Vidor