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pg_class

pg_class 是一个包含数据库中所有关系信息的系统目录表，例如所有表、索引、序列、视图、物化视图、复合类型和TOAST表。

pg_class 一直存在于PostgreSQL中。

按PostgreSQL版本定义

                     Table "pg_catalog.pg_class"
       Column        |     Type     | Collation | Nullable | Default 
---------------------+--------------+-----------+----------+---------
 oid                 | oid          |           | not null | 
 relname             | name         |           | not null | 
 relnamespace        | oid          |           | not null | 
 reltype             | oid          |           | not null | 
 reloftype           | oid          |           | not null | 
 relowner            | oid          |           | not null | 
 relam               | oid          |           | not null | 
 relfilenode         | oid          |           | not null | 
 reltablespace       | oid          |           | not null | 
 relpages            | integer      |           | not null | 
 reltuples           | real         |           | not null | 
 relallvisible       | integer      |           | not null | 
 reltoastrelid       | oid          |           | not null | 
 relhasindex         | boolean      |           | not null | 
 relisshared         | boolean      |           | not null | 
 relpersistence      | "char"       |           | not null | 
 relkind             | "char"       |           | not null | 
 relnatts            | smallint     |           | not null | 
 relchecks           | smallint     |           | not null | 
 relhasrules         | boolean      |           | not null | 
 relhastriggers      | boolean      |           | not null | 
 relhassubclass      | boolean      |           | not null | 
 relrowsecurity      | boolean      |           | not null | 
 relforcerowsecurity | boolean      |           | not null | 
 relispopulated      | boolean      |           | not null | 
 relreplident        | "char"       |           | not null | 
 relispartition      | boolean      |           | not null | 
 relrewrite          | oid          |           | not null | 
 relfrozenxid        | xid          |           | not null | 
 relminmxid          | xid          |           | not null | 
 relacl              | aclitem[]    |           |          | 
 reloptions          | text[]       | C         |          | 
 relpartbound        | pg_node_tree | C         |          | 
Indexes:
    "pg_class_oid_index" PRIMARY KEY, btree (oid)
    "pg_class_relname_nsp_index" UNIQUE CONSTRAINT, btree (relname, relnamespace)
    "pg_class_tblspc_relfilenode_index" btree (reltablespace, relfilenode)
    

                     Table "pg_catalog.pg_class"
       Column        |     Type     | Collation | Nullable | Default 
---------------------+--------------+-----------+----------+---------
 oid                 | oid          |           | not null | 
 relname             | name         |           | not null | 
 relnamespace        | oid          |           | not null | 
 reltype             | oid          |           | not null | 
 reloftype           | oid          |           | not null | 
 relowner            | oid          |           | not null | 
 relam               | oid          |           | not null | 
 relfilenode         | oid          |           | not null | 
 reltablespace       | oid          |           | not null | 
 relpages            | integer      |           | not null | 
 reltuples           | real         |           | not null | 
 relallvisible       | integer      |           | not null | 
 reltoastrelid       | oid          |           | not null | 
 relhasindex         | boolean      |           | not null | 
 relisshared         | boolean      |           | not null | 
 relpersistence      | "char"       |           | not null | 
 relkind             | "char"       |           | not null | 
 relnatts            | smallint     |           | not null | 
 relchecks           | smallint     |           | not null | 
 relhasrules         | boolean      |           | not null | 
 relhastriggers      | boolean      |           | not null | 
 relhassubclass      | boolean      |           | not null | 
 relrowsecurity      | boolean      |           | not null | 
 relforcerowsecurity | boolean      |           | not null | 
 relispopulated      | boolean      |           | not null | 
 relreplident        | "char"       |           | not null | 
 relispartition      | boolean      |           | not null | 
 relrewrite          | oid          |           | not null | 
 relfrozenxid        | xid          |           | not null | 
 relminmxid          | xid          |           | not null | 
 relacl              | aclitem[]    |           |          | 
 reloptions          | text[]       | C         |          | 
 relpartbound        | pg_node_tree | C         |          | 
Indexes:
    "pg_class_oid_index" PRIMARY KEY, btree (oid)
    "pg_class_relname_nsp_index" UNIQUE CONSTRAINT, btree (relname, relnamespace)
    "pg_class_tblspc_relfilenode_index" btree (reltablespace, relfilenode)
    

                     Table "pg_catalog.pg_class"
       Column        |     Type     | Collation | Nullable | Default 
---------------------+--------------+-----------+----------+---------
 oid                 | oid          |           | not null | 
 relname             | name         |           | not null | 
 relnamespace        | oid          |           | not null | 
 reltype             | oid          |           | not null | 
 reloftype           | oid          |           | not null | 
 relowner            | oid          |           | not null | 
 relam               | oid          |           | not null | 
 relfilenode         | oid          |           | not null | 
 reltablespace       | oid          |           | not null | 
 relpages            | integer      |           | not null | 
 reltuples           | real         |           | not null | 
 relallvisible       | integer      |           | not null | 
 reltoastrelid       | oid          |           | not null | 
 relhasindex         | boolean      |           | not null | 
 relisshared         | boolean      |           | not null | 
 relpersistence      | "char"       |           | not null | 
 relkind             | "char"       |           | not null | 
 relnatts            | smallint     |           | not null | 
 relchecks           | smallint     |           | not null | 
 relhasrules         | boolean      |           | not null | 
 relhastriggers      | boolean      |           | not null | 
 relhassubclass      | boolean      |           | not null | 
 relrowsecurity      | boolean      |           | not null | 
 relforcerowsecurity | boolean      |           | not null | 
 relispopulated      | boolean      |           | not null | 
 relreplident        | "char"       |           | not null | 
 relispartition      | boolean      |           | not null | 
 relrewrite          | oid          |           | not null | 
 relfrozenxid        | xid          |           | not null | 
 relminmxid          | xid          |           | not null | 
 relacl              | aclitem[]    |           |          | 
 reloptions          | text[]       | C         |          | 
 relpartbound        | pg_node_tree | C         |          | 
Indexes:
    "pg_class_oid_index" PRIMARY KEY, btree (oid)
    "pg_class_relname_nsp_index" UNIQUE CONSTRAINT, btree (relname, relnamespace)
    "pg_class_tblspc_relfilenode_index" btree (reltablespace, relfilenode)
    

                     Table "pg_catalog.pg_class"
       Column        |     Type     | Collation | Nullable | Default 
---------------------+--------------+-----------+----------+---------
 oid                 | oid          |           | not null | 
 relname             | name         |           | not null | 
 relnamespace        | oid          |           | not null | 
 reltype             | oid          |           | not null | 
 reloftype           | oid          |           | not null | 
 relowner            | oid          |           | not null | 
 relam               | oid          |           | not null | 
 relfilenode         | oid          |           | not null | 
 reltablespace       | oid          |           | not null | 
 relpages            | integer      |           | not null | 
 reltuples           | real         |           | not null | 
 relallvisible       | integer      |           | not null | 
 reltoastrelid       | oid          |           | not null | 
 relhasindex         | boolean      |           | not null | 
 relisshared         | boolean      |           | not null | 
 relpersistence      | "char"       |           | not null | 
 relkind             | "char"       |           | not null | 
 relnatts            | smallint     |           | not null | 
 relchecks           | smallint     |           | not null | 
 relhasrules         | boolean      |           | not null | 
 relhastriggers      | boolean      |           | not null | 
 relhassubclass      | boolean      |           | not null | 
 relrowsecurity      | boolean      |           | not null | 
 relforcerowsecurity | boolean      |           | not null | 
 relispopulated      | boolean      |           | not null | 
 relreplident        | "char"       |           | not null | 
 relispartition      | boolean      |           | not null | 
 relrewrite          | oid          |           | not null | 
 relfrozenxid        | xid          |           | not null | 
 relminmxid          | xid          |           | not null | 
 relacl              | aclitem[]    |           |          | 
 reloptions          | text[]       | C         |          | 
 relpartbound        | pg_node_tree | C         |          | 
Indexes:
    "pg_class_oid_index" PRIMARY KEY, btree (oid)
    "pg_class_relname_nsp_index" UNIQUE CONSTRAINT, btree (relname, relnamespace)
    "pg_class_tblspc_relfilenode_index" btree (reltablespace, relfilenode)
    

                     Table "pg_catalog.pg_class"
       Column        |     Type     | Collation | Nullable | Default 
---------------------+--------------+-----------+----------+---------
 oid                 | oid          |           | not null | 
 relname             | name         |           | not null | 
 relnamespace        | oid          |           | not null | 
 reltype             | oid          |           | not null | 
 reloftype           | oid          |           | not null | 
 relowner            | oid          |           | not null | 
 relam               | oid          |           | not null | 
 relfilenode         | oid          |           | not null | 
 reltablespace       | oid          |           | not null | 
 relpages            | integer      |           | not null | 
 reltuples           | real         |           | not null | 
 relallvisible       | integer      |           | not null | 
 reltoastrelid       | oid          |           | not null | 
 relhasindex         | boolean      |           | not null | 
 relisshared         | boolean      |           | not null | 
 relpersistence      | "char"       |           | not null | 
 relkind             | "char"       |           | not null | 
 relnatts            | smallint     |           | not null | 
 relchecks           | smallint     |           | not null | 
 relhasrules         | boolean      |           | not null | 
 relhastriggers      | boolean      |           | not null | 
 relhassubclass      | boolean      |           | not null | 
 relrowsecurity      | boolean      |           | not null | 
 relforcerowsecurity | boolean      |           | not null | 
 relispopulated      | boolean      |           | not null | 
 relreplident        | "char"       |           | not null | 
 relispartition      | boolean      |           | not null | 
 relrewrite          | oid          |           | not null | 
 relfrozenxid        | xid          |           | not null | 
 relminmxid          | xid          |           | not null | 
 relacl              | aclitem[]    |           |          | 
 reloptions          | text[]       | C         |          | 
 relpartbound        | pg_node_tree | C         |          | 
Indexes:
    "pg_class_oid_index" UNIQUE, btree (oid)
    "pg_class_relname_nsp_index" UNIQUE, btree (relname, relnamespace)
    "pg_class_tblspc_relfilenode_index" btree (reltablespace, relfilenode)
    

                     Table "pg_catalog.pg_class"
       Column        |     Type     | Collation | Nullable | Default 
---------------------+--------------+-----------+----------+---------
 oid                 | oid          |           | not null | 
 relname             | name         |           | not null | 
 relnamespace        | oid          |           | not null | 
 reltype             | oid          |           | not null | 
 reloftype           | oid          |           | not null | 
 relowner            | oid          |           | not null | 
 relam               | oid          |           | not null | 
 relfilenode         | oid          |           | not null | 
 reltablespace       | oid          |           | not null | 
 relpages            | integer      |           | not null | 
 reltuples           | real         |           | not null | 
 relallvisible       | integer      |           | not null | 
 reltoastrelid       | oid          |           | not null | 
 relhasindex         | boolean      |           | not null | 
 relisshared         | boolean      |           | not null | 
 relpersistence      | "char"       |           | not null | 
 relkind             | "char"       |           | not null | 
 relnatts            | smallint     |           | not null | 
 relchecks           | smallint     |           | not null | 
 relhasrules         | boolean      |           | not null | 
 relhastriggers      | boolean      |           | not null | 
 relhassubclass      | boolean      |           | not null | 
 relrowsecurity      | boolean      |           | not null | 
 relforcerowsecurity | boolean      |           | not null | 
 relispopulated      | boolean      |           | not null | 
 relreplident        | "char"       |           | not null | 
 relispartition      | boolean      |           | not null | 
 relrewrite          | oid          |           | not null | 
 relfrozenxid        | xid          |           | not null | 
 relminmxid          | xid          |           | not null | 
 relacl              | aclitem[]    |           |          | 
 reloptions          | text[]       | C         |          | 
 relpartbound        | pg_node_tree | C         |          | 
Indexes:
    "pg_class_oid_index" UNIQUE, btree (oid)
    "pg_class_relname_nsp_index" UNIQUE, btree (relname, relnamespace)
    "pg_class_tblspc_relfilenode_index" btree (reltablespace, relfilenode)
    

                     Table "pg_catalog.pg_class"
       Column        |     Type     | Collation | Nullable | Default 
---------------------+--------------+-----------+----------+---------
 relname             | name         |           | not null | 
 relnamespace        | oid          |           | not null | 
 reltype             | oid          |           | not null | 
 reloftype           | oid          |           | not null | 
 relowner            | oid          |           | not null | 
 relam               | oid          |           | not null | 
 relfilenode         | oid          |           | not null | 
 reltablespace       | oid          |           | not null | 
 relpages            | integer      |           | not null | 
 reltuples           | real         |           | not null | 
 relallvisible       | integer      |           | not null | 
 reltoastrelid       | oid          |           | not null | 
 relhasindex         | boolean      |           | not null | 
 relisshared         | boolean      |           | not null | 
 relpersistence      | "char"       |           | not null | 
 relkind             | "char"       |           | not null | 
 relnatts            | smallint     |           | not null | 
 relchecks           | smallint     |           | not null | 
 relhasoids          | boolean      |           | not null | 
 relhasrules         | boolean      |           | not null | 
 relhastriggers      | boolean      |           | not null | 
 relhassubclass      | boolean      |           | not null | 
 relrowsecurity      | boolean      |           | not null | 
 relforcerowsecurity | boolean      |           | not null | 
 relispopulated      | boolean      |           | not null | 
 relreplident        | "char"       |           | not null | 
 relispartition      | boolean      |           | not null | 
 relrewrite          | oid          |           | not null | 
 relfrozenxid        | xid          |           | not null | 
 relminmxid          | xid          |           | not null | 
 relacl              | aclitem[]    |           |          | 
 reloptions          | text[]       |           |          | 
 relpartbound        | pg_node_tree |           |          | 
Indexes:
    "pg_class_oid_index" UNIQUE, btree (oid)
    "pg_class_relname_nsp_index" UNIQUE, btree (relname, relnamespace)
    "pg_class_tblspc_relfilenode_index" btree (reltablespace, relfilenode)
    

                     Table "pg_catalog.pg_class"
       Column        |     Type     | Collation | Nullable | Default 
---------------------+--------------+-----------+----------+---------
 relname             | name         |           | not null | 
 relnamespace        | oid          |           | not null | 
 reltype             | oid          |           | not null | 
 reloftype           | oid          |           | not null | 
 relowner            | oid          |           | not null | 
 relam               | oid          |           | not null | 
 relfilenode         | oid          |           | not null | 
 reltablespace       | oid          |           | not null | 
 relpages            | integer      |           | not null | 
 reltuples           | real         |           | not null | 
 relallvisible       | integer      |           | not null | 
 reltoastrelid       | oid          |           | not null | 
 relhasindex         | boolean      |           | not null | 
 relisshared         | boolean      |           | not null | 
 relpersistence      | "char"       |           | not null | 
 relkind             | "char"       |           | not null | 
 relnatts            | smallint     |           | not null | 
 relchecks           | smallint     |           | not null | 
 relhasoids          | boolean      |           | not null | 
 relhaspkey          | boolean      |           | not null | 
 relhasrules         | boolean      |           | not null | 
 relhastriggers      | boolean      |           | not null | 
 relhassubclass      | boolean      |           | not null | 
 relrowsecurity      | boolean      |           | not null | 
 relforcerowsecurity | boolean      |           | not null | 
 relispopulated      | boolean      |           | not null | 
 relreplident        | "char"       |           | not null | 
 relispartition      | boolean      |           | not null | 
 relfrozenxid        | xid          |           | not null | 
 relminmxid          | xid          |           | not null | 
 relacl              | aclitem[]    |           |          | 
 reloptions          | text[]       |           |          | 
 relpartbound        | pg_node_tree |           |          | 
Indexes:
    "pg_class_oid_index" UNIQUE, btree (oid)
    "pg_class_relname_nsp_index" UNIQUE, btree (relname, relnamespace)
    "pg_class_tblspc_relfilenode_index" btree (reltablespace, relfilenode)
    

         Table "pg_catalog.pg_class"
       Column        |   Type    | Modifiers 
---------------------+-----------+-----------
 relname             | name      | not null
 relnamespace        | oid       | not null
 reltype             | oid       | not null
 reloftype           | oid       | not null
 relowner            | oid       | not null
 relam               | oid       | not null
 relfilenode         | oid       | not null
 reltablespace       | oid       | not null
 relpages            | integer   | not null
 reltuples           | real      | not null
 relallvisible       | integer   | not null
 reltoastrelid       | oid       | not null
 relhasindex         | boolean   | not null
 relisshared         | boolean   | not null
 relpersistence      | "char"    | not null
 relkind             | "char"    | not null
 relnatts            | smallint  | not null
 relchecks           | smallint  | not null
 relhasoids          | boolean   | not null
 relhaspkey          | boolean   | not null
 relhasrules         | boolean   | not null
 relhastriggers      | boolean   | not null
 relhassubclass      | boolean   | not null
 relrowsecurity      | boolean   | not null
 relforcerowsecurity | boolean   | not null
 relispopulated      | boolean   | not null
 relreplident        | "char"    | not null
 relfrozenxid        | xid       | not null
 relminmxid          | xid       | not null
 relacl              | aclitem[] | 
 reloptions          | text[]    | 
Indexes:
    "pg_class_oid_index" UNIQUE, btree (oid)
    "pg_class_relname_nsp_index" UNIQUE, btree (relname, relnamespace)
    "pg_class_tblspc_relfilenode_index" btree (reltablespace, relfilenode)
    

         Table "pg_catalog.pg_class"
       Column        |   Type    | Modifiers 
---------------------+-----------+-----------
 relname             | name      | not null
 relnamespace        | oid       | not null
 reltype             | oid       | not null
 reloftype           | oid       | not null
 relowner            | oid       | not null
 relam               | oid       | not null
 relfilenode         | oid       | not null
 reltablespace       | oid       | not null
 relpages            | integer   | not null
 reltuples           | real      | not null
 relallvisible       | integer   | not null
 reltoastrelid       | oid       | not null
 relhasindex         | boolean   | not null
 relisshared         | boolean   | not null
 relpersistence      | "char"    | not null
 relkind             | "char"    | not null
 relnatts            | smallint  | not null
 relchecks           | smallint  | not null
 relhasoids          | boolean   | not null
 relhaspkey          | boolean   | not null
 relhasrules         | boolean   | not null
 relhastriggers      | boolean   | not null
 relhassubclass      | boolean   | not null
 relrowsecurity      | boolean   | not null
 relforcerowsecurity | boolean   | not null
 relispopulated      | boolean   | not null
 relreplident        | "char"    | not null
 relfrozenxid        | xid       | not null
 relminmxid          | xid       | not null
 relacl              | aclitem[] | 
 reloptions          | text[]    | 
Indexes:
    "pg_class_oid_index" UNIQUE, btree (oid)
    "pg_class_relname_nsp_index" UNIQUE, btree (relname, relnamespace)
    "pg_class_tblspc_relfilenode_index" btree (reltablespace, relfilenode)
    

      Table "pg_catalog.pg_class"
     Column     |   Type    | Modifiers 
----------------+-----------+-----------
 relname        | name      | not null
 relnamespace   | oid       | not null
 reltype        | oid       | not null
 reloftype      | oid       | not null
 relowner       | oid       | not null
 relam          | oid       | not null
 relfilenode    | oid       | not null
 reltablespace  | oid       | not null
 relpages       | integer   | not null
 reltuples      | real      | not null
 relallvisible  | integer   | not null
 reltoastrelid  | oid       | not null
 relhasindex    | boolean   | not null
 relisshared    | boolean   | not null
 relpersistence | "char"    | not null
 relkind        | "char"    | not null
 relnatts       | smallint  | not null
 relchecks      | smallint  | not null
 relhasoids     | boolean   | not null
 relhaspkey     | boolean   | not null
 relhasrules    | boolean   | not null
 relhastriggers | boolean   | not null
 relhassubclass | boolean   | not null
 relispopulated | boolean   | not null
 relreplident   | "char"    | not null
 relfrozenxid   | xid       | not null
 relminmxid     | xid       | not null
 relacl         | aclitem[] | 
 reloptions     | text[]    | 
Indexes:
    "pg_class_oid_index" UNIQUE, btree (oid)
    "pg_class_relname_nsp_index" UNIQUE, btree (relname, relnamespace)
    "pg_class_tblspc_relfilenode_index" btree (reltablespace, relfilenode)
    

      Table "pg_catalog.pg_class"
     Column     |   Type    | Modifiers 
----------------+-----------+-----------
 relname        | name      | not null
 relnamespace   | oid       | not null
 reltype        | oid       | not null
 reloftype      | oid       | not null
 relowner       | oid       | not null
 relam          | oid       | not null
 relfilenode    | oid       | not null
 reltablespace  | oid       | not null
 relpages       | integer   | not null
 reltuples      | real      | not null
 relallvisible  | integer   | not null
 reltoastrelid  | oid       | not null
 reltoastidxid  | oid       | not null
 relhasindex    | boolean   | not null
 relisshared    | boolean   | not null
 relpersistence | "char"    | not null
 relkind        | "char"    | not null
 relnatts       | smallint  | not null
 relchecks      | smallint  | not null
 relhasoids     | boolean   | not null
 relhaspkey     | boolean   | not null
 relhasrules    | boolean   | not null
 relhastriggers | boolean   | not null
 relhassubclass | boolean   | not null
 relispopulated | boolean   | not null
 relfrozenxid   | xid       | not null
 relminmxid     | xid       | not null
 relacl         | aclitem[] | 
 reloptions     | text[]    | 
Indexes:
    "pg_class_oid_index" UNIQUE, btree (oid)
    "pg_class_relname_nsp_index" UNIQUE, btree (relname, relnamespace)
    

      Table "pg_catalog.pg_class"
     Column     |   Type    | Modifiers 
----------------+-----------+-----------
 relname        | name      | not null
 relnamespace   | oid       | not null
 reltype        | oid       | not null
 reloftype      | oid       | not null
 relowner       | oid       | not null
 relam          | oid       | not null
 relfilenode    | oid       | not null
 reltablespace  | oid       | not null
 relpages       | integer   | not null
 reltuples      | real      | not null
 relallvisible  | integer   | not null
 reltoastrelid  | oid       | not null
 reltoastidxid  | oid       | not null
 relhasindex    | boolean   | not null
 relisshared    | boolean   | not null
 relpersistence | "char"    | not null
 relkind        | "char"    | not null
 relnatts       | smallint  | not null
 relchecks      | smallint  | not null
 relhasoids     | boolean   | not null
 relhaspkey     | boolean   | not null
 relhasrules    | boolean   | not null
 relhastriggers | boolean   | not null
 relhassubclass | boolean   | not null
 relfrozenxid   | xid       | not null
 relacl         | aclitem[] | 
 reloptions     | text[]    | 
Indexes:
    "pg_class_oid_index" UNIQUE, btree (oid)
    "pg_class_relname_nsp_index" UNIQUE, btree (relname, relnamespace)
    

      Table "pg_catalog.pg_class"
     Column     |   Type    | Modifiers 
----------------+-----------+-----------
 relname        | name      | not null
 relnamespace   | oid       | not null
 reltype        | oid       | not null
 reloftype      | oid       | not null
 relowner       | oid       | not null
 relam          | oid       | not null
 relfilenode    | oid       | not null
 reltablespace  | oid       | not null
 relpages       | integer   | not null
 reltuples      | real      | not null
 reltoastrelid  | oid       | not null
 reltoastidxid  | oid       | not null
 relhasindex    | boolean   | not null
 relisshared    | boolean   | not null
 relpersistence | "char"    | not null
 relkind        | "char"    | not null
 relnatts       | smallint  | not null
 relchecks      | smallint  | not null
 relhasoids     | boolean   | not null
 relhaspkey     | boolean   | not null
 relhasrules    | boolean   | not null
 relhastriggers | boolean   | not null
 relhassubclass | boolean   | not null
 relfrozenxid   | xid       | not null
 relacl         | aclitem[] | 
 reloptions     | text[]    | 
Indexes:
    "pg_class_oid_index" UNIQUE, btree (oid)
    "pg_class_relname_nsp_index" UNIQUE, btree (relname, relnamespace)
    

       Table "pg_catalog.pg_class"
     Column      |   Type    | Modifiers 
-----------------+-----------+-----------
 relname         | name      | not null
 relnamespace    | oid       | not null
 reltype         | oid       | not null
 reloftype       | oid       | not null
 relowner        | oid       | not null
 relam           | oid       | not null
 relfilenode     | oid       | not null
 reltablespace   | oid       | not null
 relpages        | integer   | not null
 reltuples       | real      | not null
 reltoastrelid   | oid       | not null
 reltoastidxid   | oid       | not null
 relhasindex     | boolean   | not null
 relisshared     | boolean   | not null
 relistemp       | boolean   | not null
 relkind         | "char"    | not null
 relnatts        | smallint  | not null
 relchecks       | smallint  | not null
 relhasoids      | boolean   | not null
 relhaspkey      | boolean   | not null
 relhasexclusion | boolean   | not null
 relhasrules     | boolean   | not null
 relhastriggers  | boolean   | not null
 relhassubclass  | boolean   | not null
 relfrozenxid    | xid       | not null
 relacl          | aclitem[] | 
 reloptions      | text[]    | 
Indexes:
    "pg_class_oid_index" UNIQUE, btree (oid)
    "pg_class_relname_nsp_index" UNIQUE, btree (relname, relnamespace)
    

      Table "pg_catalog.pg_class"
     Column     |   Type    | Modifiers 
----------------+-----------+-----------
 relname        | name      | not null
 relnamespace   | oid       | not null
 reltype        | oid       | not null
 relowner       | oid       | not null
 relam          | oid       | not null
 relfilenode    | oid       | not null
 reltablespace  | oid       | not null
 relpages       | integer   | not null
 reltuples      | real      | not null
 reltoastrelid  | oid       | not null
 reltoastidxid  | oid       | not null
 relhasindex    | boolean   | not null
 relisshared    | boolean   | not null
 relistemp      | boolean   | not null
 relkind        | "char"    | not null
 relnatts       | smallint  | not null
 relchecks      | smallint  | not null
 relhasoids     | boolean   | not null
 relhaspkey     | boolean   | not null
 relhasrules    | boolean   | not null
 relhastriggers | boolean   | not null
 relhassubclass | boolean   | not null
 relfrozenxid   | xid       | not null
 relacl         | aclitem[] | 
 reloptions     | text[]    | 
Indexes:
    "pg_class_oid_index" UNIQUE, btree (oid)
    "pg_class_relname_nsp_index" UNIQUE, btree (relname, relnamespace)
    

      Table "pg_catalog.pg_class"
     Column     |   Type    | Modifiers 
----------------+-----------+-----------
 relname        | name      | not null
 relnamespace   | oid       | not null
 reltype        | oid       | not null
 relowner       | oid       | not null
 relam          | oid       | not null
 relfilenode    | oid       | not null
 reltablespace  | oid       | not null
 relpages       | integer   | not null
 reltuples      | real      | not null
 reltoastrelid  | oid       | not null
 reltoastidxid  | oid       | not null
 relhasindex    | boolean   | not null
 relisshared    | boolean   | not null
 relkind        | "char"    | not null
 relnatts       | smallint  | not null
 relchecks      | smallint  | not null
 reltriggers    | smallint  | not null
 relukeys       | smallint  | not null
 relfkeys       | smallint  | not null
 relrefs        | smallint  | not null
 relhasoids     | boolean   | not null
 relhaspkey     | boolean   | not null
 relhasrules    | boolean   | not null
 relhassubclass | boolean   | not null
 relfrozenxid   | xid       | not null
 relacl         | aclitem[] | 
 reloptions     | text[]    | 
Indexes:
    "pg_class_oid_index" UNIQUE, btree (oid)
    "pg_class_relname_nsp_index" UNIQUE, btree (relname, relnamespace)
    

      Table "pg_catalog.pg_class"
     Column     |   Type    | Modifiers 
----------------+-----------+-----------
 relname        | name      | not null
 relnamespace   | oid       | not null
 reltype        | oid       | not null
 relowner       | oid       | not null
 relam          | oid       | not null
 relfilenode    | oid       | not null
 reltablespace  | oid       | not null
 relpages       | integer   | not null
 reltuples      | real      | not null
 reltoastrelid  | oid       | not null
 reltoastidxid  | oid       | not null
 relhasindex    | boolean   | not null
 relisshared    | boolean   | not null
 relkind        | "char"    | not null
 relnatts       | smallint  | not null
 relchecks      | smallint  | not null
 reltriggers    | smallint  | not null
 relukeys       | smallint  | not null
 relfkeys       | smallint  | not null
 relrefs        | smallint  | not null
 relhasoids     | boolean   | not null
 relhaspkey     | boolean   | not null
 relhasrules    | boolean   | not null
 relhassubclass | boolean   | not null
 relfrozenxid   | xid       | not null
 relacl         | aclitem[] | 
 reloptions     | text[]    | 
Indexes:
    "pg_class_oid_index" UNIQUE, btree (oid)
    "pg_class_relname_nsp_index" UNIQUE, btree (relname, relnamespace)
    

更改历史记录

• PostgreSQL 16
  • 列relfilenode的类型从oid更改为int8 (提交05d4cbf9)
• PostgreSQL 14
  • 默认情况下，reltuples列设置为-1 (提交3d351d91)
• PostgreSQL 12
  • 现在将oid列作为普通列公开
  • 删除列relhasoids (提交578b2297)
• PostgreSQL 11
  • 删除列relhaspkey (提交f66e8bf8)
• PostgreSQL 10
  • 添加以下列 (提交f0e44751)
    • relispartition
    • relpartbound
• PostgreSQL 9.4
  • 添加列relreplident (提交07cacba9)
  • 删除列reltoastidxid (提交2ef085d0)
• PostgreSQL 9.2
  • 添加列relallvisible (提交e6858e66)
• PostgreSQL 9.1
  • 添加列relpersistence (提交5f7b58fa)
  • 删除列relistemp (提交5f7b58fa)
• PostgreSQL 8.4
  • 添加列relistemp (提交df13324f)
  • 用布尔值relhastriggers替换列reltriggers (提交e4718f2c)
  • 删除列relukeys、relfkeys和relrefs (提交e4718f2c)
• PostgreSQL 7.3
  • 添加列relnamespace (提交1dbf8aa7)

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