# comments

## 概要

Comments  
Multi-line  
table  
comment

<details>
<summary><strong>テーブル定義</strong></summary>

```sql
CREATE TABLE `comments` (
  `id` bigint NOT NULL AUTO_INCREMENT,
  `post_id` bigint NOT NULL,
  `user_id` int NOT NULL,
  `comment` text NOT NULL COMMENT 'Comment\nMulti-line\r\ncolumn\rcomment',
  `post_id_desc` bigint GENERATED ALWAYS AS ((`post_id` * -(1))) VIRTUAL,
  `created` datetime NOT NULL,
  `updated` datetime DEFAULT NULL,
  PRIMARY KEY (`id`),
  UNIQUE KEY `post_id` (`post_id`,`user_id`),
  KEY `comments_user_id_fk` (`user_id`),
  KEY `comments_post_id_user_id_idx` (`post_id`,`user_id`),
  CONSTRAINT `comments_post_id_fk` FOREIGN KEY (`post_id`) REFERENCES `posts` (`id`),
  CONSTRAINT `comments_user_id_fk` FOREIGN KEY (`user_id`) REFERENCES `users` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci COMMENT='Comments\nMulti-line\r\ntable\rcomment'
```

</details>

## カラム一覧

| 名前           | タイプ      | デフォルト値       | Nullable | Extra Definition                                 | 子テーブル                             | 親テーブル             | コメント                                       |
| ------------ | -------- | ------------ | -------- | ------------------------------------------------ | --------------------------------- | ----------------- | ------------------------------------------ |
| id           | bigint   |              | false    | auto_increment                                   |                                   |                   |                                            |
| post_id      | bigint   |              | false    |                                                  | [comment_stars](comment_stars.md) | [posts](posts.md) |                                            |
| user_id      | int      |              | false    |                                                  | [comment_stars](comment_stars.md) | [users](users.md) |                                            |
| comment      | text     |              | false    |                                                  |                                   |                   | Comment<br>Multi-line<br>column<br>comment |
| post_id_desc | bigint   |              | true     | GENERATED ALWAYS AS (\`post_id\` * -(1)) VIRTUAL |                                   |                   |                                            |
| created      | datetime |              | false    |                                                  |                                   |                   |                                            |
| updated      | datetime |              | true     |                                                  |                                   |                   |                                            |

## 制約一覧

| 名前                  | タイプ         | 定義                                          |
| ------------------- | ----------- | ------------------------------------------- |
| comments_post_id_fk | FOREIGN KEY | FOREIGN KEY (post_id) REFERENCES posts (id) |
| comments_user_id_fk | FOREIGN KEY | FOREIGN KEY (user_id) REFERENCES users (id) |
| post_id             | UNIQUE      | UNIQUE KEY post_id (post_id, user_id)       |
| PRIMARY             | PRIMARY KEY | PRIMARY KEY (id)                            |

## INDEX一覧

| 名前                           | 定義                                                              |
| ---------------------------- | --------------------------------------------------------------- |
| comments_post_id_user_id_idx | KEY comments_post_id_user_id_idx (post_id, user_id) USING BTREE |
| comments_user_id_fk          | KEY comments_user_id_fk (user_id) USING BTREE                   |
| PRIMARY                      | PRIMARY KEY (id) USING BTREE                                    |
| post_id                      | UNIQUE KEY post_id (post_id, user_id) USING BTREE               |

## ER図

![er](comments.svg)

---

> Generated by [tbls](https://github.com/k1LoW/tbls)
