SYSTEM CATALOG · 系统目录

pg_collation

The catalog pg_collation describes the available collations, which are essentially mappings from an SQL name to operating system locale categories. See Section 23.2 for more information.

首次收录 PG 9.1最近收录 PG 19当前字段 12

9.0 9.1 9.2 9.3 9.4 9.5 9.6 10 11 12 13 14 15 16 17 18 19^β3

已与 PostgreSQL 18.6 实例逐字段核对 · 原始实测记录 ↗

字段结构 PostgreSQL 18

pg_collation

字段 / COLUMN	类型 / TYPE	说明 / DESCRIPTION
`oid`	`oid`NOT NULL	Row identifier
`collname`	`name`NOT NULL	Collation name (unique per namespace and encoding)
`collnamespace`	`oid`NOT NULL	The OID of the namespace that contains this collation引用：`pg_namespace.oid`
`collowner`	`oid`NOT NULL	Owner of the collation引用：`pg_authid.oid`
`collprovider`	`"char"`NOT NULL文档原写法：`char`	Provider of the collation: d = database default, b = builtin, c = libc, i = icu
`collisdeterministic`	`boolean`NOT NULL文档原写法：`bool`	Is the collation deterministic?
`collencoding`	`integer`NOT NULL文档原写法：`int4`	Encoding in which the collation is applicable, or -1 if it works for any encoding
`collcollate`	`text`	LC_COLLATE for this collation object. If the provider is not libc, collcollate is NULL and colllocale is used instead.
`collctype`	`text`	LC_CTYPE for this collation object. If the provider is not libc, collctype is NULL and colllocale is used instead.
`colllocale`	`text`	Collation provider locale name for this collation object. If the provider is libc, colllocale is NULL; collcollate and collctype are used instead.
`collicurules`	`text`	ICU collation rules for this collation object
`collversion`	`text`	Provider-specific version of the collation. This is recorded when the collation is created and then checked when it is used, to detect changes in the collation definition that could lead to data corruption.

标记“隐式列”的字段不包含在 SELECT * 中；部分早期统计视图由同版本源码补全，额外来源会显示在字段说明中。

通用系统列 6

PostgreSQL 提供的系统属性，通常不在 SELECT * 中展开。单独保留，不与普通字段混算。

字段	类型	attnum
`tableoid`	`oid`	-6
`cmax`	`cid`	-5
`xmax`	`xid`	-4
`cmin`	`cid`	-3
`xmin`	`xid`	-2
`ctid`	`tid`	-1

字段演化矩阵

悬停查看字段类型

存在新增 / 类型或属性变化移除

字段 / COLUMN	9.0	9.1	9.2	9.3	9.4	9.5	9.6	10	11	12	13	14	15	16	17	18	19
`oid`	–
`collname`	–
`collnamespace`	–
`collowner`	–
`collencoding`	–
`collcollate`	–
`collctype`	–
`collprovider`	–	–	–	–	–	–	–
`collversion`	–	–	–	–	–	–	–
`collisdeterministic`	–	–	–	–	–	–	–	–	–
`colliculocale`	–	–	–	–	–	–	–	–	–	–	–	–			−	–	–
`collicurules`	–	–	–	–	–	–	–	–	–	–	–	–	–
`colllocale`	–	–	–	–	–	–	–	–	–	–	–	–	–	–

9.0 是收录基线；基线中已存在的字段不标记为新增。矩阵按字段名称对齐，重命名显示为旧字段移除与新字段新增。

演化时间线

相邻大版本的变化

PostgreSQL 17 ← 16

+ colllocale− colliculocale3 处字段说明更新目录说明更新

PostgreSQL 16 ← 15

+ collicurules

PostgreSQL 15 ← 14

+ colliculocale~ collcollate: name → text~ collctype: name → text~ collcollate: not_null: true → false~ collctype: not_null: true → false

PostgreSQL 14 ← 13

目录说明更新

PostgreSQL 12 ← 11

+ collisdeterministic~ oid: 隐式列 → 常规列1 处字段说明更新

PostgreSQL 10 ← 9.6

+ collprovider+ collversion

PostgreSQL 9.6 ← 9.5

目录说明更新

PostgreSQL 9.3 ← 9.2

1 处字段说明更新

PostgreSQL 9.1 ← 9.0新增目录

+ oid+ collname+ collnamespace+ collowner+ collencoding+ collcollate+ collctype

比较任意两个版本

起始版本 / FROM目标版本 / TO包含描述更新

选择两个版本，查看字段的新增、移除与类型变化。交互比较需要 JavaScript；演化时间线可直接阅读。