Question

如何在SQL Server中的外键字段上创建聚簇索引

   ALTER TABLE [PERSON_MAIL] ADD 
   CONSTRAINT [PERSON_MAIL_Person_Id] 
    FOREIGN KEY CLUSTERED ([Person_Id])
    REFERENCES PERSON_KEY(Person_Id)

当我执行上面的查询时，收到错误，例如“关键字'CLUSTERED'附近的语法不正确” 任何人都可以请帮助

Answer 1

创建主键时，您可以选择将sql server创建的索引设置为群集或非群集。

创建外键时，sql server不会创建索引，因此没有索引类型的选项。

您需要单独创建外键和索引。

alter table foo
add constraint fk_bar(bar_id) foreign key
references bar(id)
go

create clustered index ix_foo__bar_id
on foo(bar_id)
go

Answer 2

如果您没有主键PERSON KEY，则此处为解决方案：

CREATE CLUSTERED INDEX Idx_Person
    ON PERSON_KEY (Person_Id); 


BEGIN TRANSACTION
SET QUOTED_IDENTIFIER ON
SET ARITHABORT ON
SET NUMERIC_ROUNDABORT OFF
SET CONCAT_NULL_YIELDS_NULL ON
SET ANSI_NULLS ON
SET ANSI_PADDING ON
SET ANSI_WARNINGS ON
COMMIT
BEGIN TRANSACTION
GO
CREATE TABLE dbo.Tmp_PERSON_KEY
    (
    Person_Id int NOT NULL
    )  ON [PRIMARY]
GO
ALTER TABLE dbo.Tmp_PERSON_KEY SET (LOCK_ESCALATION = TABLE)
GO
IF EXISTS(SELECT * FROM dbo.PERSON_KEY)
     EXEC('INSERT INTO dbo.Tmp_PERSON_KEY (Person_Id)
        SELECT Person_Id FROM dbo.PERSON_KEY WITH (HOLDLOCK TABLOCKX)')
GO
DROP TABLE dbo.PERSON_KEY
GO
EXECUTE sp_rename N'dbo.Tmp_PERSON_KEY', N'PERSON_KEY', 'OBJECT' 
GO
ALTER TABLE dbo.PERSON_KEY ADD CONSTRAINT
    PK_PERSON_KEY PRIMARY KEY NONCLUSTERED 
    (
    Person_Id
    ) WITH( STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]

GO
CREATE CLUSTERED INDEX Idx_Person ON dbo.PERSON_KEY
    (
    Person_Id
    ) WITH( STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO
COMMIT


  ALTER TABLE [PERSON_MAIL] ADD 
   CONSTRAINT [PERSON_MAIL_Person_Id] 
    FOREIGN KEY ([Person_Id])
    REFERENCES PERSON_KEY(Person_Id)

如何在Foreign Key-Sql Server上创建聚簇索引

2 个答案: