IIF function is new to SQL Server Denali however if you worked with MS Access then you are familiar with this function. So if you are upgrading a database from Access to SQL Server Denali you don’t need to worry about rewriting the IIF function queries. IIF function will evaluate the expression and it will return one value out of two input values.
Read more: http://sql-articles.com/articles/general/iif-function-sql-server-denali/#ixzz1c5Ej6pGn
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