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T-SQL to insert data from on SQL Server DB to another

Posted on 2009-05-12
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Last Modified: 2012-05-06
I need some help in writing T-SQL to take data from on SQL Server 2005 DB and insert it into tables in another SQL Server 2005 DB.  I've got one catch, the column names don't always match.  For example:
  "Data from" column name: Issued BOM ID
  "Data to" column name: Issued_BOM_ID
The data types are the same but the "Data to" DB may have additional columns that are not in the "Data from" DB.  I would expect these to be left a the default or null.

Also, the table names don't always match as follows:
  "Data from" table name: Issued BOM
  "Data to" table name: Issued_BOM
I think this part could be handled by having a list of "Data from" table names and "Data to" tables names and pass them to the procedure.

Anyone have any suggestions on how to write this T-SQL?

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Question by:schmir1
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Expert Comment

by:Aneesh Retnakaran
ID: 24365683
In general, it will be like this
 

Use DestinationDB

INSERT INTO dbo.DestinationTable (Column1, Colummn2.. .ColumnN )

SELECT Col1,Col2, ...,NULL

FROM SourceDB.dbo.SourceTable 

<Where Condn > 

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Author Comment

by:schmir1
ID: 24366012
Is there any way to do the INSERT without specifying the column names but use column position instead.

If not, is it possible to dynamically get all column names and build the INSERT query with them.

My problem is that I've got thousands of column names scatter over about 100 tables and I need to do this twice, once for test and once with the live production data.
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Expert Comment

by:Aneesh Retnakaran
ID: 24366153
-- Is there any way to do the INSERT without specifying the column names but use column position instead.
You can do this, but you have to pass the appropriate values on approapriate positions
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Author Comment

by:schmir1
ID: 24366246
Can you give me an example?
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Accepted Solution

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Aneesh Retnakaran earned 500 total points
ID: 24366280

Use DestinationDB 

INSERT INTO dbo.DestinationTable  --- say this has 5 columns 

SELECT Col1, null, null, null, ''

FROM SourceDB.dbo.SourceTable <Where Condn > 

Open in new window

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Author Comment

by:schmir1
ID: 24367677
I'm not very familiar with T-SQL.  Are you saying to put in Col1 etc. or the actual column name?  Col1 comes up with this error:
Invalid column name 'Col1'.

Note: I need some way to do it without manually listed all the column names.
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Expert Comment

by:Aneesh Retnakaran
ID: 24367745
it should be Either the actual column name  (in case it is to be selected from a table ) or the actual value in case of a constant
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Author Comment

by:schmir1
ID: 24367761
That's the problem.  For me to type in the actual column for thousands of columns would take too long.
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Expert Comment

by:Aneesh Retnakaran
ID: 24367835
That makes it really hard, because, if the column names are the same, that would have been easy with a dynamic sql,
 
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Author Comment

by:schmir1
ID: 24390046
Since there aren't that many new columns, I'm going to add columns as needed to make the INSERT work.  Thanks for your help.
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