Constants (Calculation expression)

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Within calculation expressions constants are also available with the syntax '$constantname'.
The constants listed below are supported:
Syntax
Importance
$input
Representative for the input data of the calculation expression.
What the input data is depends strongly on the context in which the calculation is evaluated.
For example, in a label expression for data grid cells, $input returns the entire row object.
The context of the input data is usually explained by the respective entry in the manual.
$null
Stands for 'no value'.
$true
Returns the Boolean value true.
$false
Returns the Boolean value false.

Syntax	Importance
`$input`	Representative for the input data of the calculation expression. What the input data is depends strongly on the context in which the calculation is evaluated. For example, in a label expression for data grid cells, $input returns the entire row object. The context of the input data is usually explained by the respective entry in the manual.
`$null`	Stands for 'no value'.
`$true`	Returns the Boolean value true.
`$false`	Returns the Boolean value false.