tracks

Description

track information (between each stations)

Table Definition

```sql CREATE TABLE `tracks` ( `id` bigint unsigned NOT NULL AUTO_INCREMENT COMMENT 'counter to identify each record', `train_line_id` bigint unsigned NOT NULL COMMENT 'line id that has this track', `track_name` varchar(64) NOT NULL COMMENT 'name of this track', `track_description` text COMMENT 'track description', PRIMARY KEY (`id`), UNIQUE KEY `train_line_id` (`train_line_id`,`track_name`), CONSTRAINT `tracks_ibfk_1` FOREIGN KEY (`train_line_id`) REFERENCES `train_lines` (`id`) ON DELETE CASCADE ) ENGINE=InnoDB AUTO_INCREMENT=[Redacted by tbls] DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci COMMENT='track information (between each stations)' ```

Columns

#	Name	Type	Default	Nullable	Extra Definition	Children	Parents	Comment
1	id	bigint unsigned		false	auto_increment	sta_time		counter to identify each record
2	train_line_id	bigint unsigned		false			train_lines	line id that has this track
3	track_name	varchar(64)		false				name of this track
4	track_description	text		true				track description

Constraints

#	Name	Type	Definition
1	PRIMARY	PRIMARY KEY	PRIMARY KEY (id)
2	tracks_ibfk_1	FOREIGN KEY	FOREIGN KEY (train_line_id) REFERENCES train_lines (id)
3	train_line_id	UNIQUE	UNIQUE KEY train_line_id (train_line_id, track_name)

Indexes

#	Name	Definition
1	PRIMARY	PRIMARY KEY (id) USING BTREE
2	train_line_id	UNIQUE KEY train_line_id (train_line_id, track_name) USING BTREE

Relations

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Generated by tbls