Most RecentMost ViewedMost LikesLEFT Function in SSIS ExpressionsFirst published on MSDN on Jan 06, 2011 There are a number of small changes to Integration Services in SQL Server Denali that might not be immediately apparent.Conditional ConstraintsFirst published on MSDN on Nov 01, 2006 Here's a more practical example of using constraints based on variables.Using Constraints and ExpressionsFirst published on MSDN on Oct 30, 2006 Besides the regular Success and Failure constraints, you can create precedence constraints that are linked to an expression.