检查物化视图是否存在？

Question

如何检查物化视图是否存在？

我创建了一个并签入information_schema.tables，information_schema.views但我看不到它。

我应该去哪里找？

Answer 1

使用系统目录pg_class，例如：

create materialized view my_view as select 1;

select relname, relkind
from pg_class
where relname = 'my_view'
and relkind = 'm';

 relname | relkind 
---------+---------
 my_view | m
(1 row)

或系统视图pg_matviews：

select *
from pg_matviews
where matviewname = 'my_view';  

 schemaname | matviewname | matviewowner | tablespace | hasindexes | ispopulated | definition 
------------+-------------+--------------+------------+------------+-------------+------------
 public     | my_view     | postgres     |            | f          | t           |  SELECT 1;
(1 row)