SYSTEM CATALOG · 系统目录

pg_trigger

The catalog pg_trigger stores triggers on tables and views. See CREATE TRIGGER for more information.

首次收录 PG 9.0最近收录 PG 19当前字段 19

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_trigger

字段 / COLUMN	类型 / TYPE	说明 / DESCRIPTION
`oid`	`oid`NOT NULL	Row identifier
`tgrelid`	`oid`NOT NULL	The table this trigger is on引用：`pg_class.oid`
`tgparentid`	`oid`NOT NULL	Parent trigger that this trigger is cloned from (this happens when partitions are created or attached to a partitioned table); zero if not a clone引用：`pg_trigger.oid`
`tgname`	`name`NOT NULL	Trigger name (must be unique among triggers of same table)
`tgfoid`	`oid`NOT NULL	The function to be called引用：`pg_proc.oid`
`tgtype`	`smallint`NOT NULL文档原写法：`int2`	Bit mask identifying trigger firing conditions
`tgenabled`	`"char"`NOT NULL文档原写法：`char`	Controls in which session_replication_role modes the trigger fires. O = trigger fires in “origin” and “local” modes, D = trigger is disabled, R = trigger fires in “replica” mode, A = trigger fires always.
`tgisinternal`	`boolean`NOT NULL文档原写法：`bool`	True if trigger is internally generated (usually, to enforce the constraint identified by tgconstraint)
`tgconstrrelid`	`oid`NOT NULL	The table referenced by a referential integrity constraint (zero if trigger is not for a referential integrity constraint)引用：`pg_class.oid`
`tgconstrindid`	`oid`NOT NULL	The index supporting a unique, primary key, referential integrity, or exclusion constraint (zero if trigger is not for one of these types of constraint)引用：`pg_class.oid`
`tgconstraint`	`oid`NOT NULL	The pg_constraint entry associated with the trigger (zero if trigger is not for a constraint)引用：`pg_constraint.oid`
`tgdeferrable`	`boolean`NOT NULL文档原写法：`bool`	True if constraint trigger is deferrable
`tginitdeferred`	`boolean`NOT NULL文档原写法：`bool`	True if constraint trigger is initially deferred
`tgnargs`	`smallint`NOT NULL文档原写法：`int2`	Number of argument strings passed to trigger function
`tgattr`	`int2vector`NOT NULL	Column numbers, if trigger is column-specific; otherwise an empty array引用：`pg_attribute.attnum`
`tgargs`	`bytea`NOT NULL	Argument strings to pass to trigger, each NULL-terminated
`tgqual`	`pg_node_tree`	Expression tree (in nodeToString() representation) for the trigger's WHEN condition, or null if none
`tgoldtable`	`name`	REFERENCING clause name for OLD TABLE, or null if none
`tgnewtable`	`name`	REFERENCING clause name for NEW TABLE, or null if none

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
`oid`
`tgrelid`
`tgname`
`tgfoid`
`tgtype`
`tgenabled`
`tgisinternal`
`tgconstrrelid`
`tgconstrindid`
`tgconstraint`
`tgdeferrable`
`tginitdeferred`
`tgnargs`
`tgattr`
`tgargs`
`tgqual`
`tgoldtable`	–	–	–	–	–	–	–
`tgnewtable`	–	–	–	–	–	–	–
`tgparentid`	–	–	–	–	–	–	–	–	–	–

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 14 ← 13

4 处字段说明更新

PostgreSQL 13 ← 12

+ tgparentid

PostgreSQL 12 ← 11

~ oid: 隐式列 → 常规列1 处字段说明更新

PostgreSQL 10 ← 9.6

+ tgoldtable+ tgnewtable1 处字段说明更新

PostgreSQL 9.5 ← 9.4

~ tgargs: not_null: false → true

PostgreSQL 9.4 ← 9.3

1 处字段说明更新

PostgreSQL 9.3 ← 9.2

1 处字段说明更新

PostgreSQL 9.1 ← 9.0

~ tgqual: text → pg_node_tree1 处字段说明更新目录说明更新

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。