关系数据库设计 - 用户喜欢的数据库设计

时间:2021-08-25 04:29:53

Use case : Save user favorite combination to database.

使用案例:将用户喜爱的组合保存到数据库。

A user can select

用户可以选择

1."a,b,c" as his first favorite combination.

1.“a,b,c”是他最喜欢的组合。

2."a,b" as second favorite combination.

2.“a,b”作为第二喜爱的组合。

How to design a DB table for saving this information and also should be able to retrieve by querying using used id

如何设计用于保存此信息的数据库表,还应该能够通过使用已使用的ID进行查询来检索

select * from UserFav where userId = :userId should return
[a,b,c] and [a,b]

从UserFav中选择*,其中userId =:userId应返回[a,b,c]和[a,b]

Too much redundant data with this table schema

userId  combination
qw1     a,b,c
qw1     b,c

Can someone guide me to design in the best possible way.

有人可以指导我以最好的方式进行设计。

1 个解决方案

#1


6  

I would store it in individual rows, not as delimited strings:

我会将它存储在单独的行中,而不是作为分隔的字符串:

Declare @favourites table (UserID char(3), fav_list_pos int, fav_pos int, fav_val char(1))

insert into @favourites values
  ('qw1', 1, 1, 'a')
, ('qw1', 1, 2, 'b')
, ('qw1', 1, 3, 'c')
, ('qw1', 2, 1, 'a')
, ('qw1', 2, 2, 'b')

select * from @favourites where userId = 'qw1' order by fav_list_pos, fav_pos  

#1


6  

I would store it in individual rows, not as delimited strings:

我会将它存储在单独的行中,而不是作为分隔的字符串:

Declare @favourites table (UserID char(3), fav_list_pos int, fav_pos int, fav_val char(1))

insert into @favourites values
  ('qw1', 1, 1, 'a')
, ('qw1', 1, 2, 'b')
, ('qw1', 1, 3, 'c')
, ('qw1', 2, 1, 'a')
, ('qw1', 2, 2, 'b')

select * from @favourites where userId = 'qw1' order by fav_list_pos, fav_pos