highgo=# create extension "uuid-ossp";
CREATE EXTENSION
highgo=# select extname,extowner,extnamespace,extrelocatable,extversion from pg_extension;
extname | extowner | extnamespace | extrelocatable | extversion
-----------+----------+--------------+----------------+------------
plpgsql | 10 | 11 | f | 1.0
uuid-ossp | 10 | 2200 | t | 1.0
(2 rows)
highgo=# create extension "uuid-ossp";
错误: 扩展 "uuid-ossp" 已经存在
highgo=# drop extension "uuid-ossp";
DROP EXTENSION
highgo=# select extname,extowner,extnamespace,extrelocatable,extversion from pg_extension;
extname | extowner | extnamespace | extrelocatable | extversion
---------+----------+--------------+----------------+------------
plpgsql | 10 | 11 | f | 1.0
(1 row)
CREATE EXTENSION
highgo=# select extname,extowner,extnamespace,extrelocatable,extversion from pg_extension;
extname | extowner | extnamespace | extrelocatable | extversion
-----------+----------+--------------+----------------+------------
plpgsql | 10 | 11 | f | 1.0
uuid-ossp | 10 | 2200 | t | 1.0
(2 rows)
highgo=# create extension "uuid-ossp";
错误: 扩展 "uuid-ossp" 已经存在
highgo=# drop extension "uuid-ossp";
DROP EXTENSION
highgo=# select extname,extowner,extnamespace,extrelocatable,extversion from pg_extension;
extname | extowner | extnamespace | extrelocatable | extversion
---------+----------+--------------+----------------+------------
plpgsql | 10 | 11 | f | 1.0
(1 row)

本文介绍了如何在PostgreSQL中安装及管理uuid-ossp扩展,包括创建、查看和删除扩展的过程。通过具体操作展示了扩展的存在状态及其相关信息。
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