How to make nested data grouping by two columns?

Question

MySQL

It is necessary to form a grouped query on the quiz column and on the question column. That is, I want to achieve this result:




The following query gives the error "#1055 - Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column":

SELECT `quizes`.`name` AS 'quiz', `questions`.`text` AS 'question', json_arrayagg(`options`.`text`) AS 'option' FROM `quizes`
JOIN `questions` ON `questions`.`quiz_id` = `quizes`.`id`
JOIN `options` ON `options`.`question_id` = `questions`.`id`
WHERE `quizes`.`link` = 'test-quiz'
GROUP BY 'quiz' LIMIT 0, 25

What does this mean and how to fix it?

PS: The answer to my last question helped group only one column

DB dump

-- phpMyAdmin SQL Dump
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-- https://www.phpmyadmin.net/
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-- Время создания: Янв 28 2021 г., 15:09
-- Версия сервера: 8.0.13-4
-- Версия PHP: 7.2.24-0ubuntu0.18.04.7

SET SQL_MODE = "NO_AUTO_VALUE_ON_ZERO";
SET AUTOCOMMIT = 0;
START TRANSACTION;
SET time_zone = "+00:00";


/*!40101 SET @[email protected]@CHARACTER_SET_CLIENT */;
/*!40101 SET @[email protected]@CHARACTER_SET_RESULTS */;
/*!40101 SET @[email protected]@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8mb4 */;

--
-- База данных: `JWVsrFLxiw`
--

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

--
-- Структура таблицы `answers`
--

CREATE TABLE `answers` (
  `id` int(11) NOT NULL,
  `quiz_id` int(11) NOT NULL,
  `question_id` int(11) NOT NULL,
  `option_id` int(11) NOT NULL,
  `user_id` int(11) NOT NULL,
  `name` varchar(32) COLLATE utf8_unicode_ci NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

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

--
-- Структура таблицы `options`
--

CREATE TABLE `options` (
  `id` int(11) NOT NULL,
  `question_id` int(11) NOT NULL,
  `text` varchar(64) COLLATE utf8_unicode_ci NOT NULL,
  `correct` int(11) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;



--
-- Дамп данных таблицы `options`
--

INSERT INTO `options` (`id`, `question_id`, `text`, `correct`) VALUES
(1, 3, 'Вариант 1', 0),
(2, 3, 'Вариант 2', 1),
(3, 4, 'Вариант 1', 1),
(4, 4, 'Вариант 2', 0);

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

--
-- Структура таблицы `questions`
--

CREATE TABLE `questions` (
  `id` int(11) NOT NULL,
  `quiz_id` int(11) NOT NULL,
  `text` varchar(32) COLLATE utf8_unicode_ci NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

--
-- Дамп данных таблицы `questions`
--

INSERT INTO `questions` (`id`, `quiz_id`, `text`) VALUES
(3, 4, 'Вопрос первый?'),
(4, 4, 'Вопрос второй?');

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

--
-- Структура таблицы `quizes`
--

CREATE TABLE `quizes` (
  `id` int(11) NOT NULL,
  `link` varchar(32) COLLATE utf8_unicode_ci NOT NULL,
  `name` varchar(32) COLLATE utf8_unicode_ci NOT NULL,
  `creator` varchar(32) COLLATE utf8_unicode_ci NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

--
-- Дамп данных таблицы `quizes`
--

INSERT INTO `quizes` (`id`, `link`, `name`, `creator`) VALUES
(4, 'test-quiz', 'Тестовый квиз', 'yhugoy');

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

--
-- Структура таблицы `users`
--

CREATE TABLE `users` (
  `id` int(11) NOT NULL,
  `login` varchar(32) COLLATE utf8_unicode_ci NOT NULL,
  `name` varchar(32) COLLATE utf8_unicode_ci NOT NULL,
  `token` varchar(32) CHARACTER SET utf8 COLLATE utf8_unicode_ci NOT NULL,
  `avatar` text CHARACTER SET utf8 COLLATE utf8_unicode_ci NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

--
-- Дамп данных таблицы `users`
--

INSERT INTO `users` (`id`, `login`, `name`, `token`, `avatar`) VALUES
(1, 'podyganov-konstantin', 'Подыганов Константин', 'yhugoy', '');

--
-- Индексы сохранённых таблиц
--

--
-- Индексы таблицы `answers`
--
ALTER TABLE `answers`
  ADD PRIMARY KEY (`id`);

--
-- Индексы таблицы `options`
--
ALTER TABLE `options`
  ADD PRIMARY KEY (`id`);

--
-- Индексы таблицы `questions`
--
ALTER TABLE `questions`
  ADD PRIMARY KEY (`id`);

--
-- Индексы таблицы `quizes`
--
ALTER TABLE `quizes`
  ADD PRIMARY KEY (`id`);

--
-- Индексы таблицы `users`
--
ALTER TABLE `users`
  ADD PRIMARY KEY (`id`);

--
-- AUTO_INCREMENT для сохранённых таблиц
--

--
-- AUTO_INCREMENT для таблицы `answers`
--
ALTER TABLE `answers`
  MODIFY `id` int(11) NOT NULL AUTO_INCREMENT;

--
-- AUTO_INCREMENT для таблицы `options`
--
ALTER TABLE `options`
  MODIFY `id` int(11) NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=5;

--
-- AUTO_INCREMENT для таблицы `questions`
--
ALTER TABLE `questions`
  MODIFY `id` int(11) NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=5;

--
-- AUTO_INCREMENT для таблицы `quizes`
--
ALTER TABLE `quizes`
  MODIFY `id` int(11) NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=5;

--
-- AUTO_INCREMENT для таблицы `users`
--
ALTER TABLE `users`
  MODIFY `id` int(11) NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=2;
COMMIT;

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/*!40101 SET [email protected]_CHARACTER_SET_RESULTS */;
/*!40101 SET [email protected]_COLLATION_CONNECTION */;

Answer 1

the answer is easily found by a search engine