pg_constraint

用于存储约束信息的系统表

pg_constraint 是一个用于存储约束信息（不包括 NOT NULL 约束）的系统目录表。

pg_constraint 添加于 PostgreSQL 7.3。

用法

系统函数

系统函数 pg_get_constraintdef() 可用于获取约束的定义。

实现和可能的更改

NOT NULL 约束

在 PostgreSQL 17 之前，NOT NULL 约束存储在 pg_attribute 中。

域约束

提交 8abb3cda（来自 2015 年）包括一个建议，为域约束添加一个单独的表。

按 PostgreSQL 版本定义

pg_constraint (PostgreSQL 17)

                Table "pg_catalog.pg_constraint"
     Column     |     Type     | Collation | Nullable | Default 
----------------+--------------+-----------+----------+---------
 oid            | oid          |           | not null | 
 conname        | name         |           | not null | 
 connamespace   | oid          |           | not null | 
 contype        | "char"       |           | not null | 
 condeferrable  | boolean      |           | not null | 
 condeferred    | boolean      |           | not null | 
 convalidated   | boolean      |           | not null | 
 conrelid       | oid          |           | not null | 
 contypid       | oid          |           | not null | 
 conindid       | oid          |           | not null | 
 conparentid    | oid          |           | not null | 
 confrelid      | oid          |           | not null | 
 confupdtype    | "char"       |           | not null | 
 confdeltype    | "char"       |           | not null | 
 confmatchtype  | "char"       |           | not null | 
 conislocal     | boolean      |           | not null | 
 coninhcount    | smallint     |           | not null | 
 connoinherit   | boolean      |           | not null | 
 conperiod      | boolean      |           | not null | 
 conkey         | smallint[]   |           |          | 
 confkey        | smallint[]   |           |          | 
 conpfeqop      | oid[]        |           |          | 
 conppeqop      | oid[]        |           |          | 
 conffeqop      | oid[]        |           |          | 
 confdelsetcols | smallint[]   |           |          | 
 conexclop      | oid[]        |           |          | 
 conbin         | pg_node_tree | C         |          | 
Indexes:
    "pg_constraint_oid_index" PRIMARY KEY, btree (oid)
    "pg_constraint_conname_nsp_index" btree (conname, connamespace)
    "pg_constraint_conparentid_index" btree (conparentid)
    "pg_constraint_conrelid_contypid_conname_index" UNIQUE CONSTRAINT, btree (conrelid, contypid, conname)
    "pg_constraint_contypid_index" btree (contypid)

文档: pg_constraint

pg_constraint (PostgreSQL 16)

                Table "pg_catalog.pg_constraint"
     Column     |     Type     | Collation | Nullable | Default 
----------------+--------------+-----------+----------+---------
 oid            | oid          |           | not null | 
 conname        | name         |           | not null | 
 connamespace   | oid          |           | not null | 
 contype        | "char"       |           | not null | 
 condeferrable  | boolean      |           | not null | 
 condeferred    | boolean      |           | not null | 
 convalidated   | boolean      |           | not null | 
 conrelid       | oid          |           | not null | 
 contypid       | oid          |           | not null | 
 conindid       | oid          |           | not null | 
 conparentid    | oid          |           | not null | 
 confrelid      | oid          |           | not null | 
 confupdtype    | "char"       |           | not null | 
 confdeltype    | "char"       |           | not null | 
 confmatchtype  | "char"       |           | not null | 
 conislocal     | boolean      |           | not null | 
 coninhcount    | smallint     |           | not null | 
 connoinherit   | boolean      |           | not null | 
 conkey         | smallint[]   |           |          | 
 confkey        | smallint[]   |           |          | 
 conpfeqop      | oid[]        |           |          | 
 conppeqop      | oid[]        |           |          | 
 conffeqop      | oid[]        |           |          | 
 confdelsetcols | smallint[]   |           |          | 
 conexclop      | oid[]        |           |          | 
 conbin         | pg_node_tree | C         |          | 
Indexes:
    "pg_constraint_oid_index" PRIMARY KEY, btree (oid)
    "pg_constraint_conname_nsp_index" btree (conname, connamespace)
    "pg_constraint_conparentid_index" btree (conparentid)
    "pg_constraint_conrelid_contypid_conname_index" UNIQUE CONSTRAINT, btree (conrelid, contypid, conname)
    "pg_constraint_contypid_index" btree (contypid)

文档: pg_constraint

pg_constraint (PostgreSQL 15)

                Table "pg_catalog.pg_constraint"
     Column     |     Type     | Collation | Nullable | Default 
----------------+--------------+-----------+----------+---------
 oid            | oid          |           | not null | 
 conname        | name         |           | not null | 
 connamespace   | oid          |           | not null | 
 contype        | "char"       |           | not null | 
 condeferrable  | boolean      |           | not null | 
 condeferred    | boolean      |           | not null | 
 convalidated   | boolean      |           | not null | 
 conrelid       | oid          |           | not null | 
 contypid       | oid          |           | not null | 
 conindid       | oid          |           | not null | 
 conparentid    | oid          |           | not null | 
 confrelid      | oid          |           | not null | 
 confupdtype    | "char"       |           | not null | 
 confdeltype    | "char"       |           | not null | 
 confmatchtype  | "char"       |           | not null | 
 conislocal     | boolean      |           | not null | 
 coninhcount    | integer      |           | not null | 
 connoinherit   | boolean      |           | not null | 
 conkey         | smallint[]   |           |          | 
 confkey        | smallint[]   |           |          | 
 conpfeqop      | oid[]        |           |          | 
 conppeqop      | oid[]        |           |          | 
 conffeqop      | oid[]        |           |          | 
 confdelsetcols | smallint[]   |           |          | 
 conexclop      | oid[]        |           |          | 
 conbin         | pg_node_tree | C         |          | 
Indexes:
    "pg_constraint_oid_index" PRIMARY KEY, btree (oid)
    "pg_constraint_conname_nsp_index" btree (conname, connamespace)
    "pg_constraint_conparentid_index" btree (conparentid)
    "pg_constraint_conrelid_contypid_conname_index" UNIQUE CONSTRAINT, btree (conrelid, contypid, conname)
    "pg_constraint_contypid_index" btree (contypid)

文档: pg_constraint

pg_constraint (PostgreSQL 14)

               Table "pg_catalog.pg_constraint"
    Column     |     Type     | Collation | Nullable | Default 
---------------+--------------+-----------+----------+---------
 oid           | oid          |           | not null | 
 conname       | name         |           | not null | 
 connamespace  | oid          |           | not null | 
 contype       | "char"       |           | not null | 
 condeferrable | boolean      |           | not null | 
 condeferred   | boolean      |           | not null | 
 convalidated  | boolean      |           | not null | 
 conrelid      | oid          |           | not null | 
 contypid      | oid          |           | not null | 
 conindid      | oid          |           | not null | 
 conparentid   | oid          |           | not null | 
 confrelid     | oid          |           | not null | 
 confupdtype   | "char"       |           | not null | 
 confdeltype   | "char"       |           | not null | 
 confmatchtype | "char"       |           | not null | 
 conislocal    | boolean      |           | not null | 
 coninhcount   | integer      |           | not null | 
 connoinherit  | boolean      |           | not null | 
 conkey        | smallint[]   |           |          | 
 confkey       | smallint[]   |           |          | 
 conpfeqop     | oid[]        |           |          | 
 conppeqop     | oid[]        |           |          | 
 conffeqop     | oid[]        |           |          | 
 conexclop     | oid[]        |           |          | 
 conbin        | pg_node_tree | C         |          | 
Indexes:
    "pg_constraint_oid_index" PRIMARY KEY, btree (oid)
    "pg_constraint_conname_nsp_index" btree (conname, connamespace)
    "pg_constraint_conparentid_index" btree (conparentid)
    "pg_constraint_conrelid_contypid_conname_index" UNIQUE CONSTRAINT, btree (conrelid, contypid, conname)
    "pg_constraint_contypid_index" btree (contypid)

文档: pg_constraint

pg_constraint (PostgreSQL 13)

               Table "pg_catalog.pg_constraint"
    Column     |     Type     | Collation | Nullable | Default 
---------------+--------------+-----------+----------+---------
 oid           | oid          |           | not null | 
 conname       | name         |           | not null | 
 connamespace  | oid          |           | not null | 
 contype       | "char"       |           | not null | 
 condeferrable | boolean      |           | not null | 
 condeferred   | boolean      |           | not null | 
 convalidated  | boolean      |           | not null | 
 conrelid      | oid          |           | not null | 
 contypid      | oid          |           | not null | 
 conindid      | oid          |           | not null | 
 conparentid   | oid          |           | not null | 
 confrelid     | oid          |           | not null | 
 confupdtype   | "char"       |           | not null | 
 confdeltype   | "char"       |           | not null | 
 confmatchtype | "char"       |           | not null | 
 conislocal    | boolean      |           | not null | 
 coninhcount   | integer      |           | not null | 
 connoinherit  | boolean      |           | not null | 
 conkey        | smallint[]   |           |          | 
 confkey       | smallint[]   |           |          | 
 conpfeqop     | oid[]        |           |          | 
 conppeqop     | oid[]        |           |          | 
 conffeqop     | oid[]        |           |          | 
 conexclop     | oid[]        |           |          | 
 conbin        | pg_node_tree | C         |          | 
Indexes:
    "pg_constraint_conname_nsp_index" btree (conname, connamespace)
    "pg_constraint_conparentid_index" btree (conparentid)
    "pg_constraint_conrelid_contypid_conname_index" UNIQUE, btree (conrelid, contypid, conname)
    "pg_constraint_contypid_index" btree (contypid)
    "pg_constraint_oid_index" UNIQUE, btree (oid)

文档: pg_constraint

pg_constraint (PostgreSQL 12)

               Table "pg_catalog.pg_constraint"
    Column     |     Type     | Collation | Nullable | Default 
---------------+--------------+-----------+----------+---------
 oid           | oid          |           | not null | 
 conname       | name         |           | not null | 
 connamespace  | oid          |           | not null | 
 contype       | "char"       |           | not null | 
 condeferrable | boolean      |           | not null | 
 condeferred   | boolean      |           | not null | 
 convalidated  | boolean      |           | not null | 
 conrelid      | oid          |           | not null | 
 contypid      | oid          |           | not null | 
 conindid      | oid          |           | not null | 
 conparentid   | oid          |           | not null | 
 confrelid     | oid          |           | not null | 
 confupdtype   | "char"       |           | not null | 
 confdeltype   | "char"       |           | not null | 
 confmatchtype | "char"       |           | not null | 
 conislocal    | boolean      |           | not null | 
 coninhcount   | integer      |           | not null | 
 connoinherit  | boolean      |           | not null | 
 conkey        | smallint[]   |           |          | 
 confkey       | smallint[]   |           |          | 
 conpfeqop     | oid[]        |           |          | 
 conppeqop     | oid[]        |           |          | 
 conffeqop     | oid[]        |           |          | 
 conexclop     | oid[]        |           |          | 
 conbin        | pg_node_tree | C         |          | 
Indexes:
    "pg_constraint_conrelid_contypid_conname_index" UNIQUE, btree (conrelid, contypid, conname)
    "pg_constraint_oid_index" UNIQUE, btree (oid)
    "pg_constraint_conname_nsp_index" btree (conname, connamespace)
    "pg_constraint_conparentid_index" btree (conparentid)
    "pg_constraint_contypid_index" btree (contypid)

文档: pg_constraint

pg_constraint (PostgreSQL 11)

               Table "pg_catalog.pg_constraint"
    Column     |     Type     | Collation | Nullable | Default 
---------------+--------------+-----------+----------+---------
 conname       | name         |           | not null | 
 connamespace  | oid          |           | not null | 
 contype       | "char"       |           | not null | 
 condeferrable | boolean      |           | not null | 
 condeferred   | boolean      |           | not null | 
 convalidated  | boolean      |           | not null | 
 conrelid      | oid          |           | not null | 
 contypid      | oid          |           | not null | 
 conindid      | oid          |           | not null | 
 conparentid   | oid          |           | not null | 
 confrelid     | oid          |           | not null | 
 confupdtype   | "char"       |           | not null | 
 confdeltype   | "char"       |           | not null | 
 confmatchtype | "char"       |           | not null | 
 conislocal    | boolean      |           | not null | 
 coninhcount   | integer      |           | not null | 
 connoinherit  | boolean      |           | not null | 
 conkey        | smallint[]   |           |          | 
 confkey       | smallint[]   |           |          | 
 conpfeqop     | oid[]        |           |          | 
 conppeqop     | oid[]        |           |          | 
 conffeqop     | oid[]        |           |          | 
 conexclop     | oid[]        |           |          | 
 conbin        | pg_node_tree |           |          | 
 consrc        | text         |           |          | 
Indexes:
    "pg_constraint_conrelid_contypid_conname_index" UNIQUE, btree (conrelid, contypid, conname)
    "pg_constraint_oid_index" UNIQUE, btree (oid)
    "pg_constraint_conname_nsp_index" btree (conname, connamespace)
    "pg_constraint_conparentid_index" btree (conparentid)
    "pg_constraint_contypid_index" btree (contypid)

文档: pg_constraint

pg_constraint (PostgreSQL 10)

               Table "pg_catalog.pg_constraint"
    Column     |     Type     | Collation | Nullable | Default 
---------------+--------------+-----------+----------+---------
 conname       | name         |           | not null | 
 connamespace  | oid          |           | not null | 
 contype       | "char"       |           | not null | 
 condeferrable | boolean      |           | not null | 
 condeferred   | boolean      |           | not null | 
 convalidated  | boolean      |           | not null | 
 conrelid      | oid          |           | not null | 
 contypid      | oid          |           | not null | 
 conindid      | oid          |           | not null | 
 confrelid     | oid          |           | not null | 
 confupdtype   | "char"       |           | not null | 
 confdeltype   | "char"       |           | not null | 
 confmatchtype | "char"       |           | not null | 
 conislocal    | boolean      |           | not null | 
 coninhcount   | integer      |           | not null | 
 connoinherit  | boolean      |           | not null | 
 conkey        | smallint[]   |           |          | 
 confkey       | smallint[]   |           |          | 
 conpfeqop     | oid[]        |           |          | 
 conppeqop     | oid[]        |           |          | 
 conffeqop     | oid[]        |           |          | 
 conexclop     | oid[]        |           |          | 
 conbin        | pg_node_tree |           |          | 
 consrc        | text         |           |          | 
Indexes:
    "pg_constraint_oid_index" UNIQUE, btree (oid)
    "pg_constraint_conname_nsp_index" btree (conname, connamespace)
    "pg_constraint_conrelid_index" btree (conrelid)
    "pg_constraint_contypid_index" btree (contypid)

文档: pg_constraint

pg_constraint (PostgreSQL 9.6)

     Table "pg_catalog.pg_constraint"
    Column     |     Type     | Modifiers 
---------------+--------------+-----------
 conname       | name         | not null
 connamespace  | oid          | not null
 contype       | "char"       | not null
 condeferrable | boolean      | not null
 condeferred   | boolean      | not null
 convalidated  | boolean      | not null
 conrelid      | oid          | not null
 contypid      | oid          | not null
 conindid      | oid          | not null
 confrelid     | oid          | not null
 confupdtype   | "char"       | not null
 confdeltype   | "char"       | not null
 confmatchtype | "char"       | not null
 conislocal    | boolean      | not null
 coninhcount   | integer      | not null
 connoinherit  | boolean      | not null
 conkey        | smallint[]   | 
 confkey       | smallint[]   | 
 conpfeqop     | oid[]        | 
 conppeqop     | oid[]        | 
 conffeqop     | oid[]        | 
 conexclop     | oid[]        | 
 conbin        | pg_node_tree | 
 consrc        | text         | 
Indexes:
    "pg_constraint_oid_index" UNIQUE, btree (oid)
    "pg_constraint_conname_nsp_index" btree (conname, connamespace)
    "pg_constraint_conrelid_index" btree (conrelid)
    "pg_constraint_contypid_index" btree (contypid)

文档: pg_constraint

pg_constraint (PostgreSQL 9.5)

     Table "pg_catalog.pg_constraint"
    Column     |     Type     | Modifiers 
---------------+--------------+-----------
 conname       | name         | not null
 connamespace  | oid          | not null
 contype       | "char"       | not null
 condeferrable | boolean      | not null
 condeferred   | boolean      | not null
 convalidated  | boolean      | not null
 conrelid      | oid          | not null
 contypid      | oid          | not null
 conindid      | oid          | not null
 confrelid     | oid          | not null
 confupdtype   | "char"       | not null
 confdeltype   | "char"       | not null
 confmatchtype | "char"       | not null
 conislocal    | boolean      | not null
 coninhcount   | integer      | not null
 connoinherit  | boolean      | not null
 conkey        | smallint[]   | 
 confkey       | smallint[]   | 
 conpfeqop     | oid[]        | 
 conppeqop     | oid[]        | 
 conffeqop     | oid[]        | 
 conexclop     | oid[]        | 
 conbin        | pg_node_tree | 
 consrc        | text         | 
Indexes:
    "pg_constraint_oid_index" UNIQUE, btree (oid)
    "pg_constraint_conname_nsp_index" btree (conname, connamespace)
    "pg_constraint_conrelid_index" btree (conrelid)
    "pg_constraint_contypid_index" btree (contypid)

文档: pg_constraint

pg_constraint (PostgreSQL 9.4)

     Table "pg_catalog.pg_constraint"
    Column     |     Type     | Modifiers 
---------------+--------------+-----------
 conname       | name         | not null
 connamespace  | oid          | not null
 contype       | "char"       | not null
 condeferrable | boolean      | not null
 condeferred   | boolean      | not null
 convalidated  | boolean      | not null
 conrelid      | oid          | not null
 contypid      | oid          | not null
 conindid      | oid          | not null
 confrelid     | oid          | not null
 confupdtype   | "char"       | not null
 confdeltype   | "char"       | not null
 confmatchtype | "char"       | not null
 conislocal    | boolean      | not null
 coninhcount   | integer      | not null
 connoinherit  | boolean      | not null
 conkey        | smallint[]   | 
 confkey       | smallint[]   | 
 conpfeqop     | oid[]        | 
 conppeqop     | oid[]        | 
 conffeqop     | oid[]        | 
 conexclop     | oid[]        | 
 conbin        | pg_node_tree | 
 consrc        | text         | 
Indexes:
    "pg_constraint_oid_index" UNIQUE, btree (oid)
    "pg_constraint_conname_nsp_index" btree (conname, connamespace)
    "pg_constraint_conrelid_index" btree (conrelid)
    "pg_constraint_contypid_index" btree (contypid)

文档: pg_constraint

pg_constraint (PostgreSQL 9.3)

     Table "pg_catalog.pg_constraint"
    Column     |     Type     | Modifiers 
---------------+--------------+-----------
 conname       | name         | not null
 connamespace  | oid          | not null
 contype       | "char"       | not null
 condeferrable | boolean      | not null
 condeferred   | boolean      | not null
 convalidated  | boolean      | not null
 conrelid      | oid          | not null
 contypid      | oid          | not null
 conindid      | oid          | not null
 confrelid     | oid          | not null
 confupdtype   | "char"       | not null
 confdeltype   | "char"       | not null
 confmatchtype | "char"       | not null
 conislocal    | boolean      | not null
 coninhcount   | integer      | not null
 connoinherit  | boolean      | not null
 conkey        | smallint[]   | 
 confkey       | smallint[]   | 
 conpfeqop     | oid[]        | 
 conppeqop     | oid[]        | 
 conffeqop     | oid[]        | 
 conexclop     | oid[]        | 
 conbin        | pg_node_tree | 
 consrc        | text         | 
Indexes:
    "pg_constraint_oid_index" UNIQUE, btree (oid)
    "pg_constraint_conname_nsp_index" btree (conname, connamespace)
    "pg_constraint_conrelid_index" btree (conrelid)
    "pg_constraint_contypid_index" btree (contypid)

文档: pg_constraint

pg_constraint (PostgreSQL 9.2)

     Table "pg_catalog.pg_constraint"
    Column     |     Type     | Modifiers 
---------------+--------------+-----------
 conname       | name         | not null
 connamespace  | oid          | not null
 contype       | "char"       | not null
 condeferrable | boolean      | not null
 condeferred   | boolean      | not null
 convalidated  | boolean      | not null
 conrelid      | oid          | not null
 contypid      | oid          | not null
 conindid      | oid          | not null
 confrelid     | oid          | not null
 confupdtype   | "char"       | not null
 confdeltype   | "char"       | not null
 confmatchtype | "char"       | not null
 conislocal    | boolean      | not null
 coninhcount   | integer      | not null
 connoinherit  | boolean      | not null
 conkey        | smallint[]   | 
 confkey       | smallint[]   | 
 conpfeqop     | oid[]        | 
 conppeqop     | oid[]        | 
 conffeqop     | oid[]        | 
 conexclop     | oid[]        | 
 conbin        | pg_node_tree | 
 consrc        | text         | 
Indexes:
    "pg_constraint_oid_index" UNIQUE, btree (oid)
    "pg_constraint_conname_nsp_index" btree (conname, connamespace)
    "pg_constraint_conrelid_index" btree (conrelid)
    "pg_constraint_contypid_index" btree (contypid)

文档: pg_constraint

pg_constraint (PostgreSQL 9.1)

     Table "pg_catalog.pg_constraint"
    Column     |     Type     | Modifiers 
---------------+--------------+-----------
 conname       | name         | not null
 connamespace  | oid          | not null
 contype       | "char"       | not null
 condeferrable | boolean      | not null
 condeferred   | boolean      | not null
 convalidated  | boolean      | not null
 conrelid      | oid          | not null
 contypid      | oid          | not null
 conindid      | oid          | not null
 confrelid     | oid          | not null
 confupdtype   | "char"       | not null
 confdeltype   | "char"       | not null
 confmatchtype | "char"       | not null
 conislocal    | boolean      | not null
 coninhcount   | integer      | not null
 conkey        | smallint[]   | 
 confkey       | smallint[]   | 
 conpfeqop     | oid[]        | 
 conppeqop     | oid[]        | 
 conffeqop     | oid[]        | 
 conexclop     | oid[]        | 
 conbin        | pg_node_tree | 
 consrc        | text         | 
Indexes:
    "pg_constraint_oid_index" UNIQUE, btree (oid)
    "pg_constraint_conname_nsp_index" btree (conname, connamespace)
    "pg_constraint_conrelid_index" btree (conrelid)
    "pg_constraint_contypid_index" btree (contypid)

文档: pg_constraint

pg_constraint (PostgreSQL 9.0)

    Table "pg_catalog.pg_constraint"
    Column     |    Type    | Modifiers 
---------------+------------+-----------
 conname       | name       | not null
 connamespace  | oid        | not null
 contype       | "char"     | not null
 condeferrable | boolean    | not null
 condeferred   | boolean    | not null
 conrelid      | oid        | not null
 contypid      | oid        | not null
 conindid      | oid        | not null
 confrelid     | oid        | not null
 confupdtype   | "char"     | not null
 confdeltype   | "char"     | not null
 confmatchtype | "char"     | not null
 conislocal    | boolean    | not null
 coninhcount   | integer    | not null
 conkey        | smallint[] | 
 confkey       | smallint[] | 
 conpfeqop     | oid[]      | 
 conppeqop     | oid[]      | 
 conffeqop     | oid[]      | 
 conexclop     | oid[]      | 
 conbin        | text       | 
 consrc        | text       | 
Indexes:
    "pg_constraint_oid_index" UNIQUE, btree (oid)
    "pg_constraint_conname_nsp_index" btree (conname, connamespace)
    "pg_constraint_conrelid_index" btree (conrelid)
    "pg_constraint_contypid_index" btree (contypid)

文档: pg_constraint

pg_constraint (PostgreSQL 8.4)

    Table "pg_catalog.pg_constraint"
    Column     |    Type    | Modifiers 
---------------+------------+-----------
 conname       | name       | not null
 connamespace  | oid        | not null
 contype       | "char"     | not null
 condeferrable | boolean    | not null
 condeferred   | boolean    | not null
 conrelid      | oid        | not null
 contypid      | oid        | not null
 confrelid     | oid        | not null
 confupdtype   | "char"     | not null
 confdeltype   | "char"     | not null
 confmatchtype | "char"     | not null
 conislocal    | boolean    | not null
 coninhcount   | integer    | not null
 conkey        | smallint[] | 
 confkey       | smallint[] | 
 conpfeqop     | oid[]      | 
 conppeqop     | oid[]      | 
 conffeqop     | oid[]      | 
 conbin        | text       | 
 consrc        | text       | 
Indexes:
    "pg_constraint_oid_index" UNIQUE, btree (oid)
    "pg_constraint_conname_nsp_index" btree (conname, connamespace)
    "pg_constraint_conrelid_index" btree (conrelid)
    "pg_constraint_contypid_index" btree (contypid)

文档: pg_constraint

pg_constraint (PostgreSQL 8.3)

    Table "pg_catalog.pg_constraint"
    Column     |    Type    | Modifiers 
---------------+------------+-----------
 conname       | name       | not null
 connamespace  | oid        | not null
 contype       | "char"     | not null
 condeferrable | boolean    | not null
 condeferred   | boolean    | not null
 conrelid      | oid        | not null
 contypid      | oid        | not null
 confrelid     | oid        | not null
 confupdtype   | "char"     | not null
 confdeltype   | "char"     | not null
 confmatchtype | "char"     | not null
 conkey        | smallint[] | 
 confkey       | smallint[] | 
 conpfeqop     | oid[]      | 
 conppeqop     | oid[]      | 
 conffeqop     | oid[]      | 
 conbin        | text       | 
 consrc        | text       | 
Indexes:
    "pg_constraint_oid_index" UNIQUE, btree (oid)
    "pg_constraint_conname_nsp_index" btree (conname, connamespace)
    "pg_constraint_conrelid_index" btree (conrelid)
    "pg_constraint_contypid_index" btree (contypid)

文档: pg_constraint

pg_constraint (PostgreSQL 8.2)

    Table "pg_catalog.pg_constraint"
    Column     |    Type    | Modifiers 
---------------+------------+-----------
 conname       | name       | not null
 connamespace  | oid        | not null
 contype       | "char"     | not null
 condeferrable | boolean    | not null
 condeferred   | boolean    | not null
 conrelid      | oid        | not null
 contypid      | oid        | not null
 confrelid     | oid        | not null
 confupdtype   | "char"     | not null
 confdeltype   | "char"     | not null
 confmatchtype | "char"     | not null
 conkey        | smallint[] | 
 confkey       | smallint[] | 
 conbin        | text       | 
 consrc        | text       | 
Indexes:
    "pg_constraint_oid_index" UNIQUE, btree (oid)
    "pg_constraint_conname_nsp_index" btree (conname, connamespace)
    "pg_constraint_conrelid_index" btree (conrelid)
    "pg_constraint_contypid_index" btree (contypid)

文档: pg_constraint

更改历史记录

PostgreSQL 17
- NOT NULL 现在在 pg_constraint 中管理（提交 b0e96f31）
- 添加的列 conperiod（初始提交 46a0cd4c 为 conwithoutoverlaps，在 030e10ff 中重命名）已恢复（提交 8aee330a）
PostgreSQL 16
- 列 coninhcount 从 INTEGER 更改为 SMALLINT（提交 90189eef）
PostgreSQL 15
- 添加列 confdelsetcols（提交 d6f96ed9）
PostgreSQL 12
- 删除列 consrc（提交 96b00c43）
PostgreSQL 9.3
- 列 confmatchtype：默认外键匹配样式现在为 MATCH SIMPLE（提交 f5297bdf）
PostgreSQL 9.2
- 列 conisonly 重命名为 connoinherit（提交 09ff76fc）
PostgreSQL 9.0
- 添加列 conindid（提交 c1b9ec24）
PostgreSQL 8.4
- 添加列 conislocal 和 coninhcount（提交 cd902b33）
PostgreSQL 8.3
- 添加列 conpfeqop、conppeqop 和 conffeqop（提交 7bddca34）
PostgreSQL 7.3
- 添加（提交 7c6df91d）

参考文献

PostgreSQL 文档： pg_constraint

另请参见

pg_attribute、pg_depend、pg_get_constraintdef()

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pg_constraint

用法

系统函数

实现和可能的更改

NOT NULL 约束

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按 PostgreSQL 版本定义

pg_constraint (PostgreSQL 17)

pg_constraint (PostgreSQL 16)

pg_constraint (PostgreSQL 15)

pg_constraint (PostgreSQL 14)

pg_constraint (PostgreSQL 13)

pg_constraint (PostgreSQL 12)

pg_constraint (PostgreSQL 11)

pg_constraint (PostgreSQL 10)

pg_constraint (PostgreSQL 9.6)

pg_constraint (PostgreSQL 9.5)

pg_constraint (PostgreSQL 9.4)

pg_constraint (PostgreSQL 9.3)

pg_constraint (PostgreSQL 9.2)

pg_constraint (PostgreSQL 9.1)

pg_constraint (PostgreSQL 9.0)

pg_constraint (PostgreSQL 8.4)

pg_constraint (PostgreSQL 8.3)

pg_constraint (PostgreSQL 8.2)

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