Map Error - VLD-1108: Operator NVL is not properly connected

Question

Current, I am using NVL for 2 reasons:
1) return 0 if the attribute is 0 -- NVL(id, 0)
a) A constant is creted (outgrp1.const1 expression = 0)
b) A NVL (INPUTS.expr1 (id) & INPTS.expr2 (0)) is created
2) return 0 if the attributes (date - date) is 0 -- NVL ((date-date),0)
a) Created Expr to hold the result of (date - date)
b) Created another NVL (INPUTS.expr1 (result of date-date) & INPUTS.expr2 (the constant 0))
What I did wrong?
Thanks,
Syvia

Answer 1

You can use the constant by dragging and droping the 'C' icon from the mapping toolbox. After you did the drag and drop, add an attribute (let's call it CONST1) to the constant object. After that, update the properties of CONST1 and set it to your desired value by changing the value in the 'expression' field. See the online documentation for further details.
To return 0, map a constant with the value of 0 to the expr2 attribute of the NVL function, while mapping the input field value to expr1 (this refers to the NVL(number,number) function. This shold result in NVL(value,0).
Regards:
Igor