Primary Key modification

Question

Hello,
I have a table with a primary key. There is an implicit index that is created with primary key - now I wish to alter this primary key so that I can use an another existing non-unique index (or by creating a new unique index). is there a way to achieve this? there are a lot of referentials associated with this primary key; hence I do not want to drop this primary key and re-create one.
Thanks,
Onkar

Answer 1

Parent Table -
+
CREATE TABLE TEST_PARENT_1
PARENT_ID VARCHAR2(2 BYTE),
PARENT_NAME VARCHAR2(20 BYTE),
PT_TIME TIMESTAMP(6)
TABLESPACE T1
LOGGING
PARTITION BY RANGE (PT_TIME)
PARTITION P1 VALUES LESS THAN (TIMESTAMP' 2012-04-01 00:00:00')
LOGGING
NOCOMPRESS
TABLESPACE T1,
PARTITION P2 VALUES LESS THAN (TIMESTAMP' 2012-05-01 00:00:00')
LOGGING
NOCOMPRESS
TABLESPACE T1
NOCOMPRESS
NOCACHE
NOPARALLEL
MONITORING;
CREATE UNIQUE INDEX PARENT_ID_1_PK ON TEST_PARENT_1
(PARENT_ID)
LOGGING
TABLESPACE T1
NOPARALLEL;
CREATE UNIQUE INDEX TEST_PARENT_IDX_1 ON TEST_PARENT_1
(PARENT_ID, PT_TIME)
TABLESPACE T1
LOGGING
LOCAL (
PARTITION P1
LOGGING
NOCOMPRESS
TABLESPACE T1,
PARTITION P2
LOGGING
NOCOMPRESS
TABLESPACE T2
NOPARALLEL;
ALTER TABLE TEST_PARENT_1 ADD (
CONSTRAINT PARENT_ID_1_PK
PRIMARY KEY
(PARENT_ID)
USING INDEX PARENT_ID_1_PK);
+
Child Table -
+
CREATE TABLE TEST_CHILD_1
PARENT_ID VARCHAR2(2 BYTE),
CHILD_ID VARCHAR2(2 BYTE),
CHILD_FIRST_NAME VARCHAR2(20 BYTE),
CHILD_LAST_NAME VARCHAR2(20 BYTE),
PT_TIME TIMESTAMP(6)
TABLESPACE T1
LOGGING
PARTITION BY RANGE (PT_TIME)
PARTITION P1 VALUES LESS THAN (TIMESTAMP' 2012-04-01 00:00:00')
LOGGING
NOCOMPRESS
TABLESPACE T1,
PARTITION P2 VALUES LESS THAN (TIMESTAMP' 2012-05-01 00:00:00')
LOGGING
NOCOMPRESS
TABLESPACE T1
NOCOMPRESS
NOCACHE
NOPARALLEL
MONITORING;
CREATE UNIQUE INDEX CHILD_ID_1_PK ON TEST_CHILD_1
(CHILD_ID)
LOGGING
TABLESPACE T1
NOPARALLEL;
ALTER TABLE TEST_CHILD_1 ADD (
CONSTRAINT CHILD_ID_1_PK
PRIMARY KEY
(CHILD_ID)
USING INDEX CHILD_ID_1_PK);
ALTER TABLE TEST_CHILD_1 ADD (
CONSTRAINT FK_TEST_CHILD_1
FOREIGN KEY (PARENT_ID)
REFERENCES TEST_PARENT_1 (PARENT_ID)
ON DELETE CASCADE);
+
I want to use TEST_PARENT_IDX_1 index for primary key in the TEST_PARENT_1 table. I hope this snippet helps.