public function addUsing(string ...$expression) : self
    {
        $this->usingExpressions = array_merge($this->usingExpressions, $expression);

        return $this;
    }
public function addUsing(string ...$expression) : self
    {
        $this->usingExpressions = array_merge($this->usingExpressions, $expression);

        return $this;
    }
public function addUsing ( string ... $ expression ) : self { $ this -> usingExpressions = array_merge ( $ this -> usingExpressions , $ expression ) ; return $ this ; }
Adds to a "USING" expression

@param string[] $expression,... A variable list of other tables' names to use in the WHERE condition
@return self For method chaining
Adds to a USING expression