Get data of table with some data from other table - mysql

Question

I have a simple table visitor and another table visitor_tokens.
SQL creation script of visitor:
CREATE TABLE `visitor` (
`id` int(7) UNSIGNED NOT NULL,
`phone` varchar(15) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci DEFAULT NULL,
`created_at` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP,
`updated_at` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;
ALTER TABLE `visitor`
ADD PRIMARY KEY (`id`),
ADD UNIQUE KEY `phone_index` (`phone`);
ALTER TABLE `visitor`
MODIFY `id` int UNSIGNED NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=1;
INSERT INTO `visitor` (`phone`) VALUES
('111111111');
SQL creation script of visitor_tokens:
CREATE TABLE `visitor_tokens` (
`id` int(7) UNSIGNED NOT NULL,
`visitor` int(7) UNSIGNED NOT NULL,
`token` varchar(100) COLLATE utf8mb4_general_ci NOT NULL,
`created_at` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP,
`updated_at` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci;
ALTER TABLE `visitor_tokens`
ADD PRIMARY KEY (`id`);
ALTER TABLE `visitor_tokens`
MODIFY `id` int UNSIGNED NOT NULL AUTO_INCREMENT;
INSERT INTO `visitor_tokens` (`visitor`, `token`) VALUES
(1, 'abc_token'),
(1, 'xyz_token');
I want to get some data of visitor by id:
I want to get the phone number (phone column) and the visitor tokens (visitor_tokens.token). All - according to given id.
My current SQL script is: SELECT visitor.phone, visitor_tokens.token FROM visitor JOIN visitor_tokens ON visitor_tokens.visitor=visitor.id WHERE id=1. This gives me only the phone and the first token: abc. But I also want to get the tokens of the visitor from the second table. To get something like [abc_token, xyz_token]. How can I do it?

Answer 1

So this is my solution (also recommend on reading the main comments):
SELECT visitor.phone, GROUP_CONCAT(visitor_tokens.token) AS tokens FROM visitor LEFT JOIN visitor_tokens ON visitor_tokens.visitor=visitor.id WHERE visitor.id=1 LIMIT 1;
It returns result regardless of missing visitor tokens (LEFT JOIN), and also if there are tokens - it returns the tokens separated by comma in one row.