数据库设计 – 不同表的多个“联系信息”

我有一个包含表“人”,“公司”,“商店”等的数据库.这些表中的许多表必须具有“联系信息”.在 Database design – Similar Contact Information for multiple entities中提出了设计这种可能性的可能性
现在,在我的数据库中,我可以为每个联系人数据提供多个地址,多个电话和多个电子邮件.这是我的数据库架构：

因此,我将中间表“联系”作为将“联系信息”链接到每个表的最简单方法.
我的问题：做这个并且只有一行的表是一个好习惯吗？

解决方法

这就是我设计数据库的方式：

address_types
    id              unsigned int(P)
    description     varchar(10) // Mailing,Physical,etc.

addresses
    id              unsigned int(P)
    line1           varchar(50) // 123 Main Street,etc.
    line2           varchar(50) // Default NULL
    city_id         unsigned int(F cities.id)
    zip             varchar(6) // 12345,A1A 1A1,etc.
    zip4            char(4) // Default NULL
    lat             decimal(10,8) // 13.12345678,etc.
    lon             decimal(11,8) // 110.12345678,etc.

cities
    id              unsigned int(P)
    state_id        unsigned int(F states.id)
    name            varchar(50) // Omaha,Detroit,Tampa,etc.

companies
    id              unsigned int(P)
    name            varchar(75) // IBM,Microsoft,RedHat,etc.
    ...

companies_addresses
    id                  unsigned int(P)
    company_id          unsigned int(F companies.id)
    address_id          unsigned int(F addresses.id)
    address_type_id     unsigned int(F address_types.id)

companies_contacts
    id                  unsigned int(P)
    company_id          unsigned int(F companies.id)
    contact_id          unsigned int(F contacts.id)
    contact_type_id     unsigned int(F contact_types.id)

companies_emails
    id                  unsigned int(P)
    company_id          unsigned int(F companies.id)
    email_id            unsigned int(F emails.id)
    email_type_id       unsigned int(F email_types.id)

contact_types
    id              unsigned int(P)
    description     varchar(10) // Home phone,Mobile phone,FAX,etc.

在北美,电话号码如下所示：CC-AAA-EEE-SSSS-XXXXXXX,其中CC是国家代码,AAA是区号,EEE是交换机,SSSS是站,XXXXX是分机.

contacts
    id              unsigned int(P)
    country_code    varchar(3)
    area_code       varchar(3)
    exchange        varchar(3)
    station         varchar(4)
    extension       varchar(10) // Default NULL

见ISO 3166-1.

countries
    id              char(2) // ca,mx,us,etc.
    iso3            char(3) // can,mex,usa,etc.
    iso_num         char(3)
    name            varchar(44) // Canada,Mexico,United States,etc.

email_types
    id              unsigned int(P)
    description     varchar(10) // Personal,Work,etc.

emails
    id              unsigned int(P)
    address         varchar(255) // support@ibm.com,etc.

shops
    id              unsigned int(P)
    name            varchar(45) // Shop A,Shop B,etc.
    ...

shops_addresses
    id                  unsigned int(P)
    shop_id             unsigned int(F shops.id)
    address_id          unsigned int(F addresses.id)
    address_type_id     unsigned int(F address_types.id)

shops_contacts
    id                  unsigned int(P)
    shop_id             unsigned int(F shops.id)
    contact_id          unsigned int(F contacts.id)
    contact_type_id     unsigned int(F contact_types.id)

shops_emails
    id                      unsigned int(P)
    shop_id                 unsigned int(F shops.id)
    email_id                unsigned int(F emails.id)
    email_type_id           unsigned int(F email_types.id)

见ISO 3166-2.

states
    id              unsigned int(P)
    country_id      char(2)(F countries.id)
    code            varchar(2) // AL,NF,NL,etc.
    name            varchar(50) // Alabama,Newfoundland,Nuevo León,etc.

数据库设计 – 不同表的多个“联系信息”

解决方法

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