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                > pg_extension視圖存儲有關已安裝擴展的信息 | 列 | 類型 | 描述 | | --- | --- | --- | | oid | oid | 行數據標識符 | | extname | name | 擴展名稱 | | extowner | oid | 數據庫角色id,關聯`pg_authid.oid` | | extnamespace | oid | 包含此擴展的導出對象的模式 | |extrelocatable|bool|擴展是否允許被重定位| | extversion | text | 擴展版本名稱 | | extconfig | oid[] | 擴展的配置表的`regclass`項的OID數組,如果沒有配置表則為`NULL` | | extcondition | text[] | 擴展的配置表的`WHERE`子句過濾條件的數組,如果沒有則為`NULL` | `extnamespace`不是用來表示擴展屬于該模式。擴展的名字從不用模式進行限定。`extnamespace`表明該模式包含了該擴展的大部分或全部對象。如果`extrelocatable`為真,則該模式事實上必須包含屬于此擴展的全部模式限定的對象。 ``` postgres=# select * from pg_extension; oid | extname | extowner | extnamespace | extrelocatable | extversion | extconfig | extcondition -------+--------------------+----------+--------------+----------------+------------+-----------+-------------- 13566 | plpgsql | 10 | 11 | f | 1.0 | | 16446 | pg_trgm | 10 | 2200 | t | 1.5 | | 16540 | pg_freespacemap | 10 | 2200 | t | 1.2 | | 16555 | pg_visibility | 10 | 2200 | t | 1.2 | | 16565 | pg_stat_statements | 10 | 2200 | t | 1.8 | | 16439 | first_last_agg | 10 | 2200 | t | 0.1.4 | | (6 rows) ```
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