To find out columns do not exist in the same table name but in different database

Another uneasy task to be accomplished in MS SQL Server is to compare and find out what are the additional columns exist in between a same table but in 2 different version of database.


First, need to extract all the columns in the table from the 2 databases.


publicSqlDataReader GetAllColumns(string strSchema, string strTable)




              TABLE_SCHEMA = ‘” + strSchema + “‘ AND TABLE_NAME= ‘[“ +strTable + “]'”;

  SqlDataReader drdCol;


  SqlCommand cmd = newSqlCommand(strSQL, connCol);


  drdCol = cmd.ExecuteReader();


  return drdCol;



Put them in 2 Lists.


while (drd.Read())





After that compare them and put them in files.


staticList<string> Diff(List<string> ar, List<string> ar1)


  List<string> arTemp = newList<string>();

  bool blnFound;

  foreach (string cols in ar)


    blnFound = false;

    foreach (string cols1 in ar1)


      if (cols.Equals(cols1))


        blnFound = true;




    if (blnFound == false)





  return arTemp;




The complete code is in The sample file name is ConsoleAppListDiffTables.rar My MSN ID is

The code can also be downloaded at

About chanmingman

Since March 2011 Microsoft Live Spaces migrated to Wordpress ( till now, I have is over 1 million viewers. This blog is about more than 50% telling you how to resolve error messages, especial for Microsoft products. The blog also has a lot of guidance teaching you how to get stated certain Microsoft technologies. The blog also uses as a help to keep my memory. The blog is never meant to give people consulting services or silver bullet solutions. It is a contribution to the community. Thanks for your support over the years. Ming Man is Microsoft MVP since year 2006. He is a software development manager for a multinational company. With 25 years of experience in the IT field, he has developed system using Clipper, COBOL, VB5, VB6, VB.NET, Java and C #. He has been using Visual Studio (.NET) since the Beta back in year 2000. He and the team have developed many projects using .NET platform such as SCM, and HR based applications. He is familiar with the N-Tier design of business application and is also an expert with database experience in MS SQL, Oracle and AS 400.
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