nvl()

If the expression to be evaluated is not null, this returns the value of the expression, and if it is null, it returns the default value.

Syntax

nvl(VAL_EXPR, DEFAULT_EXPR)
Required Parameters
VAL_EXPR
Expression to be evaluated. If the evaluated value is not null, the function returns the evaluated value.
DEFAULT_EXPR
Value to be returned when the VAL_EXPR value is null.

Usage

json "{}" | eval nvl=nvl("hello", "") => "hello"
json "{}" | eval nvl=nvl(null, "") => ""