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ISNULL (SSIS Expression)

Returns a Boolean result based on whether an expression is null.

ISNULL(expression)

expression

Is a valid expression of any data type.

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)

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