Update using case statement in sql server 2008

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  http://www.sql-server-helper.com/sql-server-2008/merge-statement.aspx
Similarly, if the number of columns in the SELECT statement is less than the number of columns in the columns list, you will get the following error message: Msg 8159, Level 16, State 1, Line 5 'Source' has fewer columns than were specified in the column list

SQL Server: CASE Statement

  http://www.techonthenet.com/sql_server/functions/case.php
Applies To The CASE statement can be used in the following versions of SQL Server (Transact-SQL): SQL Server 2014, SQL Server 2012, SQL Server 2008 R2, SQL Server 2008, SQL Server 2005 Example The CASE statement can be used in SQL Server (Transact-SQL)

  http://sqlblog.com/blogs/hugo_kornelis/archive/2008/03/10/lets-deprecate-update-from.aspx
(In fact, SQL Server implements a superset of the ANSI standard MERGE syntax: everything described in the syntax is implemented, but there are some non-standard extensions that make the command even more useful as well. Once SQL2008 is the min platform, we should be able to use standard sql across both platforms instead of sqlserver's update from or the oracle's update of an inline view

  http://blog.sqlauthority.com/2013/04/30/sql-server-update-from-select-statement-using-join-in-update-statement-multiple-tables-in-update-statement/
-- Check the content of the table SELECT * FROM Table1 SELECT * FROM Table2 GO As you can see that using JOIN clause in UPDATE statement it makes it very easy to update data in one table from another table. However, the easiest and the most clean way is to use JOIN clause in the UPDATE statement and use multiple tables in the UPDATE statement and do the task

  http://blog.sqlauthority.com/2008/08/28/sql-server-2008-introduction-to-merge-statement-one-statement-for-insert-update-delete/
In previous versions of SQL Server, we had to write separate statements to INSERT, UPDATE, or DELETE data based on certain conditions, but now, using MERGE statement we can include the logic of such data modifications in one statement that even checks when the data is matched then just update it and when unmatched then insert it. StudentID 2 is deleted as it is more than 250, 25 marks have been added to all records that exists i.e StudentID 1,3 and the records that did not exists i.e

  http://www.bennadel.com/blog/933-using-case-statements-in-a-sql-update-query.htm
It's a little less flexible than using dynamic CF in your queries, but as long as you are only looking to return simple values the CASE statement is very powerful. Ben Nadel Aug 11, 2010 at 10:43 AM 12,304 Comments @Abhay, Are you sure that will always work? Since your CASE statement only has one condition, I am afraid that it will return NULL when that condition is not met

  http://www.c-sharpcorner.com/UploadFile/rohatash/using-case-with-select-and-update-statement-in-sql-server-20/
Reader Level: Article Using Case With Select and Update Statement in SQL Server 2012 By Rohatash Kumar on Nov 05, 2012 Case with Update Statement, Power of SQL CASE Statement, SQL Case Statement, SQL Server 2012 , In this article, I would like to show the most commonly used case expressions with update statements in SQL Server