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You must execute the code again to save those values in the database.

-- phpMyAdmin SQL Dump
-- version 5.2.1
-- https://www.phpmyadmin.net/
--
-- Host: 127.0.0.1
-- Tempo de geração: 19/07/2024 às 20:52
-- Versão do servidor: 10.4.32-MariaDB
-- Versão do PHP: 8.2.12

SET SQL_MODE = "NO_AUTO_VALUE_ON_ZERO";
START TRANSACTION;
SET time_zone = "+00:00";

/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8mb4 */;

--
-- Banco de dados: `test`
--

-- --------------------------------------------------------

--
-- Estrutura para tabela `country`
--

CREATE TABLE `country` (
  `id` int(11) NOT NULL,
  `name` varchar(255) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci;

--
-- Despejando dados para a tabela `country`
--

INSERT INTO `country` (`id`, `name`) VALUES
(1, 'Brazil'),
(2, 'USA'),
(3, 'Mexico');

-- --------------------------------------------------------

--
-- Estrutura para tabela `user`
--

CREATE TABLE `user` (
  `id` int(11) NOT NULL,
  `name` varchar(255) NOT NULL,
  `age` int(11) NOT NULL,
  `country_id` int(11) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci;

--
-- Despejando dados para a tabela `user`
--

INSERT INTO `user` (`id`, `name`, `age`, `country_id`) VALUES
(1, 'John', 30, 1),
(2, 'Mary', 35, 2),
(3, 'Richard', 15, 1),
(4, 'Cloe', 50, 2),
(5, 'Denise', 25, 3),
(6, 'Robert', 25, 1);

-- --------------------------------------------------------

--
-- Índices para tabelas despejadas
--

--
-- Índices de tabela `country`
--
ALTER TABLE `country`
  ADD PRIMARY KEY (`id`);

--
-- Índices de tabela `user`
--
ALTER TABLE `user`
  ADD PRIMARY KEY (`id`);

--
-- AUTO_INCREMENT para tabelas despejadas
--

--
-- AUTO_INCREMENT de tabela `country`
--
ALTER TABLE `country`
  MODIFY `id` int(11) NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=4;

--
-- AUTO_INCREMENT de tabela `user`
--
ALTER TABLE `user`
  MODIFY `id` int(11) NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=7;

/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;

SELECT country.name as country,
(SELECT GROUP_CONCAT(user.name SEPARATOR ' \/ ') FROM user WHERE user.country_id=country.ID) AS userFromCountry
FROM `country`

country	userFromCountry
Brazil	John / Richard / Robert
USA	Mary / Cloe
Mexico	Denise