Топ-100
 

CREATE MATERIALIZED VIEW

Описания команд доступны в программе CerebroSQL

RDBMS Type: Oracle
Topic

CREATE MATERIALIZED VIEW [ schema. ] materialized_view
[ OF [ schema. ] object_type ]
[ ( { scoped_table_ref_constraint
| column_alias [ENCRYPT [encryption_spec]]
}
[, { scoped_table_ref_constraint
| column_alias [ENCRYPT [encryption_spec]]
}
]...
)
]
{ ON PREBUILT TABLE
[ { WITH | WITHOUT } REDUCED PRECISION ]
| physical_properties materialized_view_props
}
[ USING INDEX
[ physical_attributes_clause
| TABLESPACE tablespace
]...
| USING NO INDEX
]
[ create_mv_refresh ]
[ FOR UPDATE ]
[ { DISABLE | ENABLE } QUERY REWRITE ]
AS subquery ;

Example

CREATE MATERIALIZED VIEW foreign_customers FOR UPDATE
AS SELECT * FROM sh.customers@remote cu
WHERE EXISTS
(SELECT * FROM sh.countries@remote co
WHERE co.country_id = cu.country_id);

CREATE MATERIALIZED VIEW LOG ON times
WITH ROWID, SEQUENCE (time_id, calendar_year)
INCLUDING NEW VALUES;

CREATE MATERIALIZED VIEW LOG ON products
WITH ROWID, SEQUENCE (prod_id)
INCLUDING NEW VALUES;

CREATE MATERIALIZED VIEW sales_mv
BUILD IMMEDIATE
REFRESH FAST ON COMMIT
AS SELECT t.calendar_year, p.prod_id,
SUM(s.amount_sold) AS sum_sales
FROM times t, products p, sales s
WHERE t.time_id = s.time_id AND p.prod_id = s.prod_id
GROUP BY t.calendar_year, p.prod_id;

CREATE MATERIALIZED VIEW sales_by_month_by_state
TABLESPACE example
PARALLEL 4
BUILD IMMEDIATE
REFRESH COMPLETE
ENABLE QUERY REWRITE
AS SELECT t.calendar_month_desc, c.cust_state_province,
SUM(s.amount_sold) AS sum_sales
FROM times t, sales s, customers c
WHERE s.time_id = t.time_id AND s.cust_id = c.cust_id
GROUP BY t.calendar_month_desc, c.cust_state_province;

CREATE TABLE sales_sum_table
(month VARCHAR2(8), state VARCHAR2(40), sales NUMBER(10,2));

CREATE MATERIALIZED VIEW sales_sum_table
ON PREBUILT TABLE WITH REDUCED PRECISION
ENABLE QUERY REWRITE
AS SELECT t.calendar_month_desc AS month,
c.cust_state_province AS state,
SUM(s.amount_sold) AS sales
FROM times t, customers c, sales s
WHERE s.time_id = t.time_id AND s.cust_id = c.cust_id
GROUP BY t.calendar_month_desc, c.cust_state_province;

CREATE MATERIALIZED VIEW catalog
REFRESH FAST START WITH SYSDATE NEXT SYSDATE + 1/4096
WITH PRIMARY KEY
AS SELECT * FROM product_information;

CREATE MATERIALIZED VIEW order_data REFRESH WITH ROWID
AS SELECT * FROM orders;

CREATE MATERIALIZED VIEW LOG ON employees
WITH PRIMARY KEY
INCLUDING NEW VALUES;

CREATE MATERIALIZED VIEW emp_data
PCTFREE 5 PCTUSED 60
TABLESPACE example
STORAGE (INITIAL 50K)
REFRESH FAST NEXT sysdate + 7
AS SELECT * FROM employees;

CREATE MATERIALIZED VIEW all_customers
PCTFREE 5 PCTUSED 60
TABLESPACE example
STORAGE (INITIAL 50K)
USING INDEX STORAGE (INITIAL 25K)
REFRESH START WITH ROUND(SYSDATE + 1) + 11/24
NEXT NEXT_DAY(TRUNC(SYSDATE), 'MONDAY') + 15/24
AS SELECT * FROM sh.customers@remote
UNION
SELECT * FROM sh.customers@local;