公交车时刻表数据库设计

Question

我正在尝试设计一个数据库来存储300条不同公交线路的时间表.每条路线有不同的停靠次数和周一至周五,周六和周日的不同时间.我已经表示了每条路线的公共汽车出发时间如下,我不确定表中是否应该有空值,这看起来不错吗？

route,Num,Day,    t1,   t2,   t3,    t4    t5      t6      t7      t8     t9    t10 

117, 1, Monday,   9:00, 9:30, 10:50, 12:00, 14:00  18:00   19:00   null   null   null
117, 2, Monday,   9:03, 9:33, 10:53, 12:03, 14:03  18:03   19:03   null   null   null
117, 3, Monday,   9:06, 9:36, 10:56, 12:06, 14:06  18:06   19:06   null   null   null
117, 4, Monday,   9:09, 9:39, 10:59, 12:09, 14:09  18:09   19:09   null   null   null
.
.
.
117, 20, Monday,   9:39, 10.09, 11:39, 12:39, 14:39  18:39   19:39   null   null   null
119, 1, Monday,   9:00, 9:30, 10:50, 12:00, 14:00  18:00   19:00   20:00  21:00  22:00
119, 2, Monday,   9:03, 9:33, 10:53, 12:03, 14:03  18:03   19:03   20:03  21:03  22:03
119, 3, Monday,   9:06, 9:36, 10:56, 12:06, 14:06  18:06   19:06   20:06  21:06  22:06
119, 4, Monday,   9:09, 9:39, 10:59, 12:09, 14:09  18:09   19:09   20:09  21:09  22:09
.
.
.
119, 37, Monday,   9:49, 9:59, 11:59, 12:59, 14:59  18:59   19:59   20:59  21:59  22:59
139, 1, Sunday,   9:00, 9:30,  20:00  21:00  22:00  null   null     null    null   null  
139, 2, Sunday,   9:03, 9:33,  20:03  21:03  22:03  null   null     null    null   null  
139, 3, Sunday,   9:06, 9:36,  20:06  21:06  22:06  null   null     null    null   null  
139, 4, Sunday,   9:09, 9:39,  20:09  21:09  22:09  null   null     null    null   null  
.
.
.
139, 20, Sunday,   9:49, 9:59, 20:59  21:59  22:59  null   null     null    null   null  

Answer 1

不,它看起来不行.每个Route/Day/Stop时间值应该在一个单独的行中:

 Route, Day, Run #, Stop #, Time

 117, Monday, 1, 1, 9:00
 117, Monday, 1, 2, 9:30
 117, Monday, 1, 3, 10:50
 117, Monday, 1, 4, 12:00
 . . . Finish Run #1 . . .
 117, Monday, 2, 1, 9:03
 117, Monday, 2, 2, 9:33
 117, Monday, 2, 3, 10:53
 117, Monday, 2, 4, 12:03

等等

理想情况下,您将拥有一个包含Route,Day,Run#的单独表,并将它们分配给唯一的RunID整数值,然后使用该值代替StopTimes表中的Route,Day和Run#列.

通常,如果末尾有索引号的列(Time1,Time2或Phone1,Phone2),则表明您的数据库不是根据规范化原则设计的.

当然,您将数据转换为您建议发布的格式.