1 创建视图

Create schema tpcds;
CREATE TABLE tpcds.customer
(  c_customer_sk             integer,   
  c_customer_id             char(5),    
  c_first_name              char(6),    
  c_last_name               char(8) 
) ;
INSERT INTO tpcds.customer VALUES    
(6885, 1, 'Joes', 'Hunter'),    
(4321, 2, 'Lily','Carter'),    
(9527, 3, 'James', 'Cook'),
(9500, 4, 'Lucy', 'Baker');
--创建视图
CREATE VIEW tpcds.v_customer_details_view AS
SELECT * FROM tpcds.customer
WHERE c_customer_sk > 5400;
--查看视图内容
select * from tpcds.v_customer_details_view;

zyfdb=> select * from tpcds.v_customer_details_view;
 c_customer_sk | c_customer_id | c_first_name | c_last_name
---------------+---------------+--------------+-------------
          6885 | 1             | Joes         | Hunter
          9527 | 3             | James        | Cook
          9500 | 4             | Lucy         | Baker
(3 rows)

2 基于视图建立新的视图

create  VIEW tpcds.part_view as  
SELECT * FROM  tpcds.v_customer_details_view where  c_customer_sk =9527;
 --查看新的视图
select * from tpcds.part_view;

 c_customer_sk | c_customer_id | c_first_name | c_last_name
---------------+---------------+--------------+-------------
          9527 | 3             | James        | Cook

3 创建物化视图

drop materialized view if exists mv_test;
drop table if exists test;
create table test(id serial primary key,testnum serial);
insert into test(testnum) values(generate_series(1,100000));

--创建物化视图：
create materialized view mv_test as 
select * from test where testnum%2=0;

--查看物化视图目前有多少行记录：
select count(*) from mv_test;


zyfdb=> select count(*) from mv_test;
 count
-------
 50000
(1 row)

zyfdb=> select count(*)from test;
 count
--------
 100000
(1 row)

4 手动更新物化视图

insert into test(testnum) values(generate_series(1,100000));
INSERT 0 100000
zyfdb=> select count(*) from mv_test;
 count
-------
 50000
(1 row)


--手动更新物化视图，并查看更新物化视图后，物化视图有多少行记录：
  refresh materialized view mv_test;
 select count(*) from mv_test;
  count
--------
 100000
(1 row)

5 删除视图

--删除普通视图
DROP view tpcds.part_view;
DROP view TPCDS.customer_details_view_v1;

--删除物化视图
DROP MATERIALIZED VIEW mv_test;