ISNULL (SSIS Expression)
SQL Server 2012
Returns a Boolean result based on whether an expression is null.
This example returns TRUE if the DiscontinuedDate column contains a null value.
ISNULL(DiscontinuedDate)
This example returns "Unknown last name" if the value in the LastName column is null, otherwise it returns the value in LastName.
ISNULL(LastName)? "Unknown last name":LastName
This example always returns TRUE if the DaysToManufacture column is null, regardless of the value of the variable AddDays.
ISNULL(DaysToManufacture + @AddDays)
