Sql 如何创建成员表结构？

我在SQL Server中有一个成员表结构：

member\u表

memberid name address email
111      aaa  IND     a@a.com
222      bbb  UK      b@b.com

现在我想提供这样的便利，一个成员可以跟随其他成员。我该怎么做

我应该创建一个新表吗？我应该用旗子吗

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我想创建一个新表并给成员表

您可以创建另一个由两个属性组成的表（成员id，后面是成员id）

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此表保存每个成员的记录，然后是其他成员的记录。这两个属性都引用您的成员表。这是在规范化多个关系时创建多个关系的标准方法

您可以创建另一个由两个属性组成的表（成员id，后面是成员id）

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此表保存每个成员的记录，然后是其他成员的记录。这两个属性都引用您的成员表。这是在规范化多个关系时创建多个关系的标准方法

我将创建一个连接表，在两个成员ID上都有一个键，以确保最多有一行

我尽量不迎合YGWITs（您可能会想要它），但订阅表似乎需要一些额外的元数据，例如订阅开始日期或最后访问日期，以了解是否有新活动

我最终会得到这样的结果：

CREATE TABLE [dbo].[member_subscription](
    [member_id] [int] NOT NULL,
    [target_member_id] [int] NOT NULL,
    [date_created] [datetime] NOT NULL,
    [date_last_visit] [datetime] NULL,
    CONSTRAINT [PK_member_subscription] PRIMARY KEY CLUSTERED 
    (   -- key on both member_id fields
        [member_id] ASC,
        [target_member_id] ASC
    ) WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]

GO

-- Foreign key contrain for member_id
ALTER TABLE [dbo].[member_subscription]  WITH CHECK ADD  CONSTRAINT [FK_member_subscription_member] FOREIGN KEY([member_id])
REFERENCES [dbo].[member] ([member_id])
GO
ALTER TABLE [dbo].[member_subscription] CHECK CONSTRAINT [FK_member_subscription_member]
GO


-- Foreign key contrain for target_member_id
ALTER TABLE [dbo].[member_subscription]  WITH CHECK ADD  CONSTRAINT [FK_member_subscription_target_member] FOREIGN KEY([target_member_id])
REFERENCES [dbo].[member] ([member_id])
GO
ALTER TABLE [dbo].[member_subscription] CHECK CONSTRAINT [FK_member_subscription_target_member]
GO

-- Default value for date_created
ALTER TABLE [dbo].[member_subscription] ADD  CONSTRAINT [DF_member_subscription_datecreated]  DEFAULT (getdate()) FOR [date_created]
GO

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我将创建一个连接表，在两个成员ID上都有一个键，以确保最多有一行

我尽量不迎合YGWITs（您可能会想要它），但订阅表似乎需要一些额外的元数据，例如订阅开始日期或最后访问日期，以了解是否有新活动

我最终会得到这样的结果：

CREATE TABLE [dbo].[member_subscription](
    [member_id] [int] NOT NULL,
    [target_member_id] [int] NOT NULL,
    [date_created] [datetime] NOT NULL,
    [date_last_visit] [datetime] NULL,
    CONSTRAINT [PK_member_subscription] PRIMARY KEY CLUSTERED 
    (   -- key on both member_id fields
        [member_id] ASC,
        [target_member_id] ASC
    ) WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]

GO

-- Foreign key contrain for member_id
ALTER TABLE [dbo].[member_subscription]  WITH CHECK ADD  CONSTRAINT [FK_member_subscription_member] FOREIGN KEY([member_id])
REFERENCES [dbo].[member] ([member_id])
GO
ALTER TABLE [dbo].[member_subscription] CHECK CONSTRAINT [FK_member_subscription_member]
GO


-- Foreign key contrain for target_member_id
ALTER TABLE [dbo].[member_subscription]  WITH CHECK ADD  CONSTRAINT [FK_member_subscription_target_member] FOREIGN KEY([target_member_id])
REFERENCES [dbo].[member] ([member_id])
GO
ALTER TABLE [dbo].[member_subscription] CHECK CONSTRAINT [FK_member_subscription_target_member]
GO

-- Default value for date_created
ALTER TABLE [dbo].[member_subscription] ADD  CONSTRAINT [DF_member_subscription_datecreated]  DEFAULT (getdate()) FOR [date_created]
GO

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也许是一张有跟随者和跟随者的跟随者表？你是在2008年还是2005年？也许是一张有跟随者和跟随者的跟随者表？你是在2008年还是2005年？？