src/Db/Query/Query.php
public function whereIsNull(string $fieldName, string $logicalOperator = LogicalOperator::AND)
    {
        return $this->where($fieldName, 'is', null, $logicalOperator);
    }
public function whereIsNull(string $fieldName, string $logicalOperator = LogicalOperator::AND)
    {
        return $this->where($fieldName, 'is', null, $logicalOperator);
    }
public function whereIsNull ( string $ fieldName , string $ logicalOperator = LogicalOperator :: AND ) { return $ this -> where ( $ fieldName , 'is' , null , $ logicalOperator ) ; }
where field is null
@param string $fieldName
@param string $logicalOperator
@return static
where field is null