/**
phpDox
Overview
Namespaces
Interfaces
Classes
Traits
Source
Overview
Classes
Zend\Db\Sql\Predicate
IsNull
getSpecification
Introduction
Synopsis
Return
Source
Zend\Db\Sql\Predicate\IsNull::
getSpecification
Get specification string to use in forming SQL predicate
Signature
public function getSpecification()
Returns
string