Existence-dependent aggregation using the clustering technique : Cluster « Table « Oracle PL / SQL






  1. Oracle PL / SQL
  2. Table
  3. Cluster

Existence-dependent aggregation using the clustering technique

   
SQL>
SQL> CREATE CLUSTER Part_Cluster
  2     (hd_id            VARCHAR2(10));

Cluster created.

SQL>
SQL> CREATE TABLE Hard_Disk
  2     (hd_id            VARCHAR2(10) NOT NULL,
  3      capacity         VARCHAR2(20),
  4      PRIMARY KEY (hd_id))
  5     CLUSTER Part_Cluster(hd_id);

Table created.

SQL>
SQL> CREATE TABLE PartType
  2     (hd_id            VARCHAR2(10) NOT NULL,
  3      PartType_id      VARCHAR2(10) NOT NULL,
  4      description      VARCHAR2(25),
  5      PRIMARY KEY (hd_id, PartType_id),
  6      FOREIGN KEY (hd_id) REFERENCES Hard_Disk (hd_id)) CLUSTER Part_Cluster(hd_id);

Table created.

SQL>
SQL> CREATE INDEX Part_Cluster_Index
  2  ON CLUSTER Part_Cluster;

Index created.



SQL> drop table Hard_Disk cascade constraints;

Table dropped.

SQL> drop table PartType  cascade constraints;

Table dropped.








Related examples in the same category

1.create cluster
2.Cluster with varchar2 column
3.Create cluster and set hashkeys, size
4.Create cluster and then create table on top of it
5.Exclusive aggregation using the clustering technique
6.Oracle provides a clustering technique that can be very useful for an aggregation relationship.
7.drop cluster