Re: How to drop unique index

From: <G.Plivna_at_itsystems.lv>
Date: Wed, 30 May 2001 07:16:26 -0700
Message-ID: <F001.0031373E.20010530063616@fatcity.com>

If it is an unique index that enforces unique constraint you cannot simply drop it
You have to drop unique constraint
alter table tablename drop constraint constraintname;

an example follows

SQL> desc qaqa1

 Name                            Null?    Type
 ------------------------------- -------- ----
 COL1                                     NUMBER(5)
 COL2                                     VARCHAR2(4000)

SQL> select * from user_constraints where table_name = 'QAQA1';

no rows selected

SQL> select * from user_indexes where table_name = 'QAQA1';

no rows selected

SQL> alter table qaqa1 add constraint zzz unique (col1);

Table altered.

SQL> select * from user_constraints where table_name = 'QAQA1';

OWNER                          CONSTRAINT_NAME                C TABLE_NAME
------------------------------ ------------------------------ -
-----------------------
MANTAOWNER                     ZZZ                            U QAQA1

SQL> select * from user_indexes where table_name = 'QAQA1';

INDEX_NAME                     INDEX_TYPE                  TABLE_OWNER
------------------------------ ---------------------------
----------------------------
ZZZ                            NORMAL                      MANTAOWNER

SQL> drop index zzz;
drop index zzz

           *
ERROR at line 1:
ORA-02429: cannot drop index used for enforcement of unique/primary key

SQL> alter table qaqa1 drop constraint zzz;

Table altered.

SQL> select * from user_constraints where table_name = 'QAQA1';

no rows selected

SQL> select * from user_indexes where table_name = 'QAQA1';

no rows selected

Gints Plivna

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  INET: G.Plivna_at_itsystems.lv

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