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

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Oracle PL / SQL » Table » 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(10NOT 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(10NOT NULL,
  3      PartType_id      VARCHAR2(10NOT NULL,
  4      description      VARCHAR2(25),
  5      PRIMARY KEY (hd_id, PartType_id),
  6      FOREIGN KEY (hd_idREFERENCES 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.

   
    
    
  
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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
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