[每日一题] OCP1z0-047 :2013-07-16主键与唯一索引

gyj@OCM> Create table products(
 2  product_id number(6) constraintprod_id_pk PRIMARY KEY,
 3  product_name varchar2(15)
 4  );

Table created.

gyj@OCM> select INDEX_NAME,INDEX_TYPE,UNIQUENESS fromuser_indexes where TABLE_NAME='PRODUCTS';

INDEX_NAME               INDEX_TYPE     UNIQUENES
------------------------------　　--------------------------- 　　---------
PROD_ID_PK               NORMAL         UNIQUE

gyj@OCM> create table t10 (id int unique,name varchar2(10));


Table created.

gyj@OCM> select INDEX_NAME,INDEX_TYPE,UNIQUENESS from user_indexes where TABLE_NAME='T10';


INDEX_NAME                     INDEX_TYPE                  UNIQUENES
------------------------------ --------------------------- ---------
SYS_C0011336                   NORMAL                      UNIQUE