CREATE MATERIALIZED VIEW view_name AS query_sql WITH [NO] DATA; 物化视图创建语法与普通视图类似,区别有: 使用关键字 MATERIALIZED 来指示这是一个物化视图。 定义的最后使用 WITH DATA 或 WITH NO DATA 来指定创建后的物化视图是否需要同步数据。不指定时默认是 WITH DATA。 使用
CREATE [OR REPLACE] [TEMP | TEMPORARY] [RECURSIVE] VIEW name [(column_name[,...])] [WITH (view_option_name [=view_option_value][,...])] AS query [WITH [CASCADED | LOCAL] CHECK OPTION] 1. 创建普通视图 CREATE VIEW vw_employee AS SELECT empid,begindate,enddate,companyname,responsibi...
CREATE OR REPLACE FUNCTION update_my_view()RETURNS TRIGGER AS $$DECLAREBEGIN-- Update the materialized view here.REFRESH MATERIALIZED VIEW CONCURRENTLY vvv;RETURN NULL;END;$$ LANGUAGE plpgsql; 触发器的创建(此触发器是基于基表的哦): CREATE TRIGGER update_my_view_triggerAFTER INSERT OR UPDATE OR D...
However, it can be slower and requires a unique index on all columns of the Materialized View. Full Refresh: This method re-executes the Materialized View's query and replaces the old data. While it can be faster than the concurrent method, it locks the view during the refresh, making ...
warehouse_db=# insert into tab_view values (1,'Adam','Chicago'); INSERT 0 1 warehouse_db=# insert into tab_view values (2,'John','Miami'),(3,'Smith','Dallas'); INSERT 0 2 warehouse_db=# create view view_select as select * from tab_view ; ...
-- Author: dtboost-- CreateDate: 2023-12-13 11:22:41-- Description:createorreplace incremental materialized view v_order_wideasselecto.order_id,o.order_time,to_char(o.order_time,'YYYY-MM-DD')asorder_date,o.customer_id,c.customer_name,o.store_id,s.store_name,o.product_id,p.product...
Command: REFRESH MATERIALIZED VIEW Description:replacethecontentsofamaterializedviewSyntax:REFRESHMATERIALIZEDVIEW[ CONCURRENTLY ]name[WITH[NO]DATA] 运行刷新很简单: demo=# REFRESH MATERIALIZED VIEW mat_view; REFRESH MATERIALIZED VIEW PostgreSQL 知道必须重新执行以刷新物化视图内容的查询。只有一个缺点:PostgreSQL ...
CREATE MATERIALIZED VIEW mv1 REFRESH FAST ON COMMIT AS SELECT * FROM employees; Create a trigger that will initiate a refresh after every DML command on the underlying tables: CREATE OR REPLACE FUNCTION refresh_mv1() returns trigger language plpgsql as $$ begin refresh ...
--drop view tab_info_v cascade; CREATE or replace VIEW tab_info_v AS WITH schemainfo AS ( SELECT pg_namespace.oid, pg_namespace.nspname FROM pg_namespace ), tbinfo AS ( SELECT pg_class.oid, pg_class.relname, (col_description(pg_class.oid, 0))::character varying AS comment, ...
CREATE MATERIALIZED VIEW materialized_view_name AS SELECT id, SUM(clicks) AS sum_clicks FROM database_name.base_table GROUP BY id ORDER BY id’ 1. 2. 3. 4. 物化视图的创建当前为异步操作。创建物化视图的语法会立即返回结果,但物化视图的生成操作可能仍在运行。用户可以使用DESC "base_table_name"...