Is there a BulkUpdate command in SQL Server 2008 that is equivalent to BulkCopy?

Here, a typical strategy is:

• Using SQL BulkCopy, bulk-load data into a staging table that is empty and has the same fields and data types as the production system's production tables.
• To change the values in the actual data, perform an update by linking the real data to the staging data.

I am the project's owner, which is Disclaimer.

The Bulk Operations Library makes it possible to quickly insert, delete, update, and merge millions of records.

If you are already familiar with the SqlBulkCopy class, it's quite simple to understand and utilize.

var bulk = new BulkOperation(connection);
// ... Mappings ....

bulk.BulkUpdate(dt);

Not at all, no.

What exactly is a lac?

This aid is zzz-13 zzz

http://itknowledgeexchange.techtarget.com/itanswers/bulk-update-in-sql-server-2005/

Assuming that you have a column with distict values to show you which rows are which between the two tables this can be done with a simple update statement.

UPDATE TableA
SET TableA.A1 = TableB.B1,
    TableA.A2 = TableB.B2  
FROM TableB  
WHERE TableA.A3 = TableB.B3

If you are worried about creating one massive transaction you can batch the operation into smaller chunks. This is done via the TOP keyword.

UPDATE TOP (1000) TableA
SET TableA.A1 = TableB.B1,
    TableA.A2 = TableB.B2  
FROM TableB  
WHERE TableA.A3 = TableB.B3
      AND TableA.A1 <> TableB.B1
      AND TableA.A2 <> TableB.B2

You can put that into a loop...

Another link (with essentially the same answer) is provided here:

http://www.sqlusa.com/bestpractices2005/hugeupdate/