If-not query operation.

Builds a ?? (optionally ?? <value>) query fragment, providing a fallback when a prior boolean query yields FALSE.

Usage

IfNot(value = NULL, ...)

Arguments

value

Optional fallback value (character scalar), or a piped DafrQuery.

...

Optional piped DafrQuery.

Value

A DafrQuery.

See also

IfMissing()

Examples

IfNot()
#> <DafrQuery> ?? 
IfNot("fallback")
#> <DafrQuery> ?? fallback