如何在具有不同数据类型的复合键上添加集群？

Question

我有几个 table 想要聚类，但是，我已将问题归结为这个 table。这就是我创建集群的方式：

create cluster xyz_clus
(xyz_key int,
date1 date,
time timestamp
);

这是我添加索引的方式：

create index  xyz_clus_idx on cluster xyz_clus;

这是我制作的table：

 create table ABC
    (
    PRIMARY KEY (date1, time, number1),
    date1 date,  
    time timestamp(0), 
    number1 int not null,
    classnumber varchar(7) not null, 
    constraint timeslot_classnumber_fk Foreign Key (classnumber) references class (classnumber)
    )
      cluster xyz_clus(date1, time, number1);

但是，无论我多么努力，我都会不断收到此错误

ORA-01753: column definition incompatible with clustered column definition

Answer 1

正如我在您的中所解释的，数据类型 a 需要完全匹配。以下代码有效：

CREATE TABLE abc (
  date1       DATE,  
  time        TIMESTAMP, 
  number1     INT NOT NULL,
  classnumber VARCHAR2(7) NOT NULL, 
  PRIMARY KEY (date1, time, number1),  
  CONSTRAINT timeslot_classnumber_fk FOREIGN KEY (classnumber) 
             REFERENCES CLASS (classnumber)
) CLUSTER xyz_clus(number1, date1, time);
Table ABC created

但是，这会导致错误，因为它在 table 中使用了 TIMESTAMP(0)，在集群中使用了 TIMESTAMP：

CREATE TABLE abc (
  date1       DATE,  
  time        TIMESTAMP(0), 
  number1     INT NOT NULL,
  classnumber VARCHAR2(7) NOT NULL, 
  PRIMARY KEY (date1, time, number1),  
  CONSTRAINT timeslot_classnumber_fk FOREIGN KEY (classnumber) 
             REFERENCES CLASS (classnumber)
) CLUSTER xyz_clus(number1, date1, time);
ORA-01753: column definition incompatible with clustered column definition

同样，复合键中列的顺序也很重要。以下查询具有正确的 TIMESTAMP，但 table 中列的顺序是 DATE, TIMESTAMP, INT，而在集群 INT, DATE, TIMESTAMP 中：

CREATE TABLE abc (
  date1       DATE,  
  time        TIMESTAMP, 
  number1     INT NOT NULL,
  classnumber VARCHAR2(7) NOT NULL, 
  PRIMARY KEY (date1, time, number1),  
  CONSTRAINT timeslot_classnumber_fk FOREIGN KEY (classnumber) 
             REFERENCES CLASS (classnumber)
) CLUSTER xyz_clus(date1, time, number1);
ORA-01753: column definition incompatible with clustered column definition

如何在具有不同数据类型的复合键上添加集群？

How do i add a cluster on a composite key with different datatypes?

sql

oracle

indexing

sqlplus

composite-key