我在下面创建了Oracle物化视图:
CREATE MATERIALIZED VIEW MyMV
REFRESH COMPLETE ON DEMAND
AS
SELECT t1.*
FROM table1 t1, table2 t2 where t1.id=t2.id;
table1有一个主键,MV已成功创建,但主键未在物化视图表中创建。
有没有其他方法可以用主键创建MV?
答案 0 :(得分:3)
这是因为您的物化视图基于两个表,如果您基于具有主键的单个表创建视图,则在物化视图上创建主键。 如果需要,您仍然可以在之后创建索引:
SQL> create table t1(id number);
Table created.
SQL> create table t2(id number);
Table created.
SQL> alter table t1 add primary key (id);
Table altered.
SQL> alter table t2 add primary key (id);
Table altered.
SQL> CREATE MATERIALIZED VIEW MyMV
REFRESH COMPLETE ON DEMAND
AS
SELECT t1.*
FROM t1, t2 where t1.id=t2.id; 2 3 4 5
Materialized view created.
SQL> create unique index myindex on MyMV(id);
Index created.
修改强>
创建主键而不是唯一索引:
SQL> alter materialized view MyMV add constraint PK_ID primary key (id);
Materialized view altered.
SQL> alter table t3 add constraint FK_TABLE3_MyMV foreign key (id) references MyMV (id);
Table altered.