42704 — 未定义对象（undefined_object）

引用的数据库对象不存在，如触发器或类型。

英文手册覆盖始于 PostgreSQL 8.1. 来源历史与运行验证各自保留独立版本边界。

当前阅读 PG 18·选择有来源记录的版本

8.1 8.2 8.3 8.4 9.0 9.1 9.2 9.3 9.4 9.5 9.6 10 11 12 13 14 15 16 17 18 19 20

aliases: 未知
class name: Syntax Error or Access Rule Violation
condition name: undefined_object
lang: en
sqlstate: 42704

版本定义 PG 18

42704 — 未定义对象

速览 {#at-a-glance}

SQLSTATE 42704 是 Class 42 中的 undefined_object。42704 表示未定义对象。选定 DROP TRIGGER 路径在真实表上指定不存在的触发器，报告 trigger "%s" for table "%s" does not exist；随后可以创建并删除真实触发器。

含义 {#meaning}

42704 表示未定义对象。get_trigger_oid 按已解析关系 OID 和触发器名称扫描 pg_trigger；当 DROP TRIGGER 要求对象而没有匹配行时，会发出 ERROR：trigger "%s" for table "%s" does not exist。选定路径在真实表上指定不存在的触发器，随后用创建并删除真实触发器验证修复生命周期。

对象类型决定查找方式和报文：固定分支包括类型名解析失败的 type "%s" does not exist、角色查找失败的 role "%s" does not exist、按关系 OID 扫描约束失败的 constraint "%s" for table "%s" does not exist，以及在访问方法下解析限定名或 search_path 中 opclass 失败的 operator class "%s" does not exist for access method "%s"。选定路径更具体：get_trigger_oid 按关系 OID 和触发器名查 pg_trigger，当前表没有匹配行时发出 trigger "%s" for table "%s" does not exist；随后案例只为验证修复生命周期而创建并删除真实触发器。

诊断 {#diagnosis}

先按主报文分类。对于选定触发器分支，检查 DDL 实际解析到的带 schema 关系、准确触发器名称（包括带引号大小写）和迁移顺序；触发器可能存在于另一张表，但由于源码按关系 OID 和名称查找，在当前关系上仍不存在。对于类型或角色报文，检查准确限定名以及 type/role 目录；对于约束报文，检查关系 OID/名称组合和迁移顺序；对于 opclass 报文，检查访问方法以及 opclass 查找使用的 schema/search_path。schema 缺失或未限定关系不存在属于另一类 namespace/未定义关系诊断，权限失败则是 42501。未找到对象的 ERROR 后选定自动提交会话仍为 IDLE；显式 BEGIN 中它会让事务进入 INERROR，直到 ROLLBACK 或回滚到合适保存点。它不同于 dblink 句柄错误 08003 和预备语句名称错误 26000。

处理 {#response}

按报文指出的对象类型修复：改正限定名或 search_path，按依赖顺序应用前置迁移，或在对应 owner 的迁移中创建/重命名预期的 type、role、constraint 或 operator class。仅对选定触发器案例，才应显式操作目标关系，核对 owner、时机/事件、行级或语句级定义及函数，并在迁移要求时删除准确触发器。如果对象本来就是可选的，应有意识地选择幂等迁移策略；不要用 CASCADE、无关对象或通用的“先创建再删除”作为修复。显式事务报错后，先回滚事务或合适保存点，再重试。

报文 {#messages}

选定的 get_trigger_oid 分支以明确的 ERROR 发出主报文 trigger "%s" for table "%s" does not exist；触发器名和表名都是动态值。其他固定未定义对象分支发出 type "%s" does not exist、role "%s" does not exist、constraint "%s" for table "%s" does not exist 或 operator class "%s" does not exist for access method "%s"。只有客户端异常而没有对应对象类型的服务器 SQLSTATE 和主报文时，不能据此识别 42704。

代表案例 {#case}

本页使用与运行器注册表相同的语句。执行时，syntax_schema、syntax_role 等生成名称会替换为一次性实例中的实际值。

CREATE TABLE syntax_schema.trigger_table (id integer);
DROP TRIGGER missing_trigger ON syntax_schema.trigger_table;
CREATE FUNCTION syntax_schema.trigger_function() RETURNS trigger LANGUAGE plpgsql AS $$ BEGIN RETURN NEW; END $$;
CREATE TRIGGER valid_trigger BEFORE INSERT ON syntax_schema.trigger_table FOR EACH ROW EXECUTE PROCEDURE syntax_schema.trigger_function();
DROP TRIGGER valid_trigger ON syntax_schema.trigger_table;
SELECT count(*) FROM pg_trigger WHERE tgrelid = 'syntax_schema.trigger_table'::regclass AND NOT tgisinternal;

选定的 18.6 运行记录结构化诊断并通过修复断言；10.21 运行通过同一案例的具体检查。可下载的案例和证据投影分别是 42704 案例 JSON 和 作者证据。运行器清单为 verify/cases/42704/cases.json，页面 SQL 会与共享注册表核对。

版本 {#versions}

选定的自然运行范围是 PostgreSQL 18.6 与 10.21，不能据此推断所有中间版本的行为。

来源 {#sources}

src.errcodes.18.6 — fixed errcodes.txt definition at commit 724edf9bde9d356724ad384a2e196edc3c9f80f7; SHA-256 6e8de346643ba84aa3c9c6a73360acfc7b2dfb89162c06c08ce9bf5bcd5bbcba (source).
src.missing-trigger.18.6 — src/backend/commands/trigger.c at REL_18_6 commit 724edf9bde9d356724ad384a2e196edc3c9f80f7; fixed blob SHA-256 0a539af85b0de1a04779f92202e7bfc77d85ae6da1747ea32527c67f39084fbd (source).
src.missing-trigger.10.23 — src/backend/commands/trigger.c at REL_10_23 commit 02991e79f8f58bc208f05dcc8af0c62dbe0a6ea4; fixed blob SHA-256 dac7cdcbe2df1a1bbc77daa23e808b0c81ba8891c9895f10e8b270a15316e225 (source).
src.undefined-type.18.6 / src.undefined-type.10.23 — fixed type-name lookup branches; blob SHA-256 fe4670d2401141761096077c6495dd1b7d6a0baf33c9b903f25baee2f88ffd1e / 729d30e50cea059ccfe13491fdc5f997ff98c227795693bf166a163925beb663 (18.6 source, 10.23 source).
src.undefined-role.18.6 / src.undefined-role.10.23 — fixed DROP ROLE lookup branches; blob SHA-256 aa8769a2577fff287301d6c82169262cca328515ae940d5a2be4b3e8c21617ed / 9fc68a5a18c4bb5388cc817d2f3f2fcdc64f2752eaa429f78f54b0b443fb59ec (18.6 source, 10.23 source).
src.undefined-constraint.18.6 / src.undefined-constraint.10.23 — fixed relation-constraint lookup branches; blob SHA-256 0aa324acd355da955f8eb6cec17f1a0138277a8bebd2c6e999cd2a603d3bfa01 / c90dff2d1d863e6b43102d762cec6e08b6c4ba40458045b525a14b49865d8a65 (18.6 source, 10.23 source).
src.undefined-opclass.18.6 / src.undefined-opclass.10.23 — fixed access-method/opclass lookup branches; blob SHA-256 f28ac0580c805553724dc623dd4e20f32de1a84db637e6ac3c6e3d296bd2fae5 / 85c646706908d13dc449bcffa6690d6ead8d326498051fef6b08f817347fa947 (18.6 source, 10.23 source).
src.calls.REL_18_6 / src.calls.REL_10_23 — fixed call scans, SHA-256 9ee8a0e81d8f0825c5c1ae45583439859a26e602bdd4ce2f2a62aa278867ccbf / 00d16d3eb01b71ccf1b245c8f3102f9d0ec9f36fb02777b8dd1b99fcb263040c.

比较版本

SQLSTATE 证据与已记录的运行版本

cases · missing_trigger

{
  "assertions": [
    "SQLSTATE is 42704 with a missing-trigger diagnostic",
    "The session remains IDLE",
    "Creating and dropping a real trigger completes the repair lifecycle"
  ],
  "case_id": "missing_trigger",
  "cleanup": "Drop the case schema with an owner connection.",
  "has_snippet": true,
  "position": 0,
  "preconditions": [
    "A runner-owned disposable target is provisioned.",
    "PL/pgSQL is available for the repair trigger function."
  ],
  "repair": "Inspect the relation and trigger name; create or drop the intended trigger explicitly rather than changing unrelated objects.",
  "trigger": "Drop a named trigger that does not exist on a real table.",
  "versions": [
    "10",
    "18"
  ]
}

claims · identity.class-and-condition

{
  "claim_id": "identity.class-and-condition",
  "limits": "Directory identity does not identify every backend path.",
  "method": "Read fixed errcodes.txt and the locked catalogue metadata.",
  "position": 0,
  "runtime": [],
  "sources": [
    "src.errcodes.18.6"
  ],
  "statement": "42704 is the undefined_object condition in Class 42."
}

claims · mechanism.backend-path

{
  "claim_id": "mechanism.backend-path",
  "limits": "Other calls can use the same SQLSTATE with different context or dynamic fields.",
  "method": "Trace the resolved REL_18_6 and REL_10_23 source call records at the locked commits.",
  "position": 1,
  "runtime": [],
  "sources": [
    "src.missing-trigger.18.6",
    "src.missing-trigger.10.23",
    "src.undefined-type.18.6",
    "src.undefined-type.10.23",
    "src.undefined-role.18.6",
    "src.undefined-role.10.23",
    "src.undefined-constraint.18.6",
    "src.undefined-constraint.10.23",
    "src.undefined-opclass.18.6",
    "src.undefined-opclass.10.23"
  ],
  "statement": "The fixed source calls for 42704 include the mechanism and message boundary selected for this page."
}

claims · mechanism.object-resolution-branches

{
  "claim_id": "mechanism.object-resolution-branches",
  "limits": "Only missing_trigger has an accepted natural runtime in this batch; the other messages are source-confirmed boundaries.",
  "method": "Read the complete fixed lookup functions and their undefined-object error branches at REL_18_6 and REL_10_23.",
  "position": 2,
  "runtime": [],
  "sources": [
    "src.undefined-type.18.6",
    "src.undefined-type.10.23",
    "src.undefined-role.18.6",
    "src.undefined-role.10.23",
    "src.undefined-constraint.18.6",
    "src.undefined-constraint.10.23",
    "src.undefined-opclass.18.6",
    "src.undefined-opclass.10.23"
  ],
  "statement": "Fixed 42704 producers resolve different object categories at different lookup points, including type, role, relation constraint, and access-method operator class; the selected runtime covers only the relation-scoped trigger branch."
}

claims · runtime.representative-case

{
  "claim_id": "runtime.representative-case",
  "limits": "This covers the selected case and targets only; it does not generalize to all drivers or intermediate releases.",
  "method": "Run the shared registry case and inspect structured diagnostics, state/recovery assertions, and cleanup.",
  "position": 3,
  "runtime": [
    "runtime.42704-syntax-latest1.latest",
    "runtime.42704-syntax-pg10.pg10"
  ],
  "sources": [
    "manifest.42704",
    "snippet-registry.42704"
  ],
  "statement": "The selected missing_trigger case passed on isolated PostgreSQL 18.6 and 10.21 targets."
}

claims · versions.catalogue-boundary

{
  "claim_id": "versions.catalogue-boundary",
  "limits": "Definition presence is not an exact behavioral introduction.",
  "method": "Read generated facts and selected summaries.",
  "position": 4,
  "runtime": [],
  "sources": [
    "src.errcodes.18.6",
    "src.calls.REL_18_6",
    "src.calls.REL_10_23"
  ],
  "statement": "The locked catalogue records 42704; runtime scope is limited to the selected targets."
}

messages · message.missing-trigger

{
  "limits": "",
  "message_id": "message.missing-trigger",
  "path": "",
  "position": 0,
  "raw": {
    "id": "message.missing-trigger",
    "primary_template": "trigger \"%s\" for table \"%s\" does not exist",
    "severity_source": "explicit ERROR",
    "sources": [
      "src.missing-trigger.18.6",
      "src.missing-trigger.10.23"
    ],
    "sqlstate": "42704"
  },
  "severity": "explicit ERROR",
  "sources": [
    "src.missing-trigger.18.6",
    "src.missing-trigger.10.23"
  ],
  "templates": [
    {
      "kind": "primary",
      "literal": "trigger \" \" for table \" \" does not exist",
      "position": 0,
      "role": "",
      "template": "trigger \"%s\" for table \"%s\" does not exist"
    }
  ]
}

messages · message.undefined-type

{
  "limits": "Source-only type lookup branch; no natural runtime is claimed.",
  "message_id": "message.undefined-type",
  "path": "",
  "position": 1,
  "raw": {
    "id": "message.undefined-type",
    "limits": "Source-only type lookup branch; no natural runtime is claimed.",
    "primary_template": "type \"%s\" does not exist",
    "severity_source": "explicit ERROR",
    "sources": [
      "src.undefined-type.18.6",
      "src.undefined-type.10.23"
    ],
    "sqlstate": "42704"
  },
  "severity": "explicit ERROR",
  "sources": [
    "src.undefined-type.18.6",
    "src.undefined-type.10.23"
  ],
  "templates": [
    {
      "kind": "primary",
      "literal": "type \" \" does not exist",
      "position": 0,
      "role": "",
      "template": "type \"%s\" does not exist"
    }
  ]
}

messages · message.undefined-role

{
  "limits": "Source-only DROP ROLE lookup branch; NOTICE missing_ok paths are not selected here.",
  "message_id": "message.undefined-role",
  "path": "",
  "position": 2,
  "raw": {
    "id": "message.undefined-role",
    "limits": "Source-only DROP ROLE lookup branch; NOTICE missing_ok paths are not selected here.",
    "primary_template": "role \"%s\" does not exist",
    "severity_source": "explicit ERROR",
    "sources": [
      "src.undefined-role.18.6",
      "src.undefined-role.10.23"
    ],
    "sqlstate": "42704"
  },
  "severity": "explicit ERROR",
  "sources": [
    "src.undefined-role.18.6",
    "src.undefined-role.10.23"
  ],
  "templates": [
    {
      "kind": "primary",
      "literal": "role \" \" does not exist",
      "position": 0,
      "role": "",
      "template": "role \"%s\" does not exist"
    }
  ]
}

messages · message.undefined-constraint

{
  "limits": "Source-only relation constraint lookup branch; no natural runtime is claimed.",
  "message_id": "message.undefined-constraint",
  "path": "",
  "position": 3,
  "raw": {
    "id": "message.undefined-constraint",
    "limits": "Source-only relation constraint lookup branch; no natural runtime is claimed.",
    "primary_template": "constraint \"%s\" for table \"%s\" does not exist",
    "severity_source": "explicit ERROR",
    "sources": [
      "src.undefined-constraint.18.6",
      "src.undefined-constraint.10.23"
    ],
    "sqlstate": "42704"
  },
  "severity": "explicit ERROR",
  "sources": [
    "src.undefined-constraint.18.6",
    "src.undefined-constraint.10.23"
  ],
  "templates": [
    {
      "kind": "primary",
      "literal": "constraint \" \" for table \" \" does not exist",
      "position": 0,
      "role": "",
      "template": "constraint \"%s\" for table \"%s\" does not exist"
    }
  ]
}

messages · message.undefined-opclass

{
  "limits": "Source-only access-method/operator-class lookup branch; no natural runtime is claimed.",
  "message_id": "message.undefined-opclass",
  "path": "",
  "position": 4,
  "raw": {
    "id": "message.undefined-opclass",
    "limits": "Source-only access-method/operator-class lookup branch; no natural runtime is claimed.",
    "primary_template": "operator class \"%s\" does not exist for access method \"%s\"",
    "severity_source": "explicit ERROR",
    "sources": [
      "src.undefined-opclass.18.6",
      "src.undefined-opclass.10.23"
    ],
    "sqlstate": "42704"
  },
  "severity": "explicit ERROR",
  "sources": [
    "src.undefined-opclass.18.6",
    "src.undefined-opclass.10.23"
  ],
  "templates": [
    {
      "kind": "primary",
      "literal": "operator class \" \" does not exist for access method \" \"",
      "position": 0,
      "role": "",
      "template": "operator class \"%s\" does not exist for access method \"%s\""
    }
  ]
}

runtimes · runtime.42704-syntax-latest1.latest · 18.6 (Homebrew) · passed

{
  "cases": [],
  "limits": "",
  "position": 0,
  "raw": {
    "assertions": [
      {
        "expected": "42704",
        "name": "42704 SQLSTATE",
        "observed": "42704",
        "passed": true
      },
      {
        "expected": "ERROR",
        "name": "42704 ERROR severity",
        "observed": "ERROR",
        "passed": true
      },
      {
        "expected": "trigger ... does not exist",
        "name": "missing-trigger diagnostic names trigger",
        "observed": "trigger \"missing_trigger\" for table \"trigger_table\" does not exist",
        "passed": true
      },
      {
        "expected": "IDLE",
        "name": "missing trigger leaves session usable",
        "observed": "IDLE",
        "passed": true
      },
      {
        "expected": {
          "status": "IDLE",
          "triggers": 0
        },
        "name": "real trigger lifecycle repairs object path",
        "observed": {
          "status": "IDLE",
          "triggers": 0
        },
        "passed": true
      }
    ],
    "case_manifest": {
      "id": "manifest.42704",
      "kind": "local_artifact",
      "path": "verify/cases/42704/cases.json",
      "sha256": "ac45b2c35a40efef31fd9dbf6bf283723aec24fcf5ad58841b9684a3b3412b89",
      "source_role": "case_manifest"
    },
    "cleanup": {
      "errors": [],
      "passed": true
    },
    "environment": {
      "TimeZone": "Asia/Shanghai",
      "backend_pid": 1721,
      "binary": {
        "bindir": "/opt/homebrew/Cellar/postgresql@18/18.6/bin",
        "pg_config": "/opt/homebrew/bin/pg_config",
        "pg_config_version": "PostgreSQL 18.6 (Homebrew)",
        "postgres": "/opt/homebrew/Cellar/postgresql@18/18.6/bin/postgres"
      },
      "connection_scope": "runner-owned localhost port",
      "current_user": "runner",
      "docker": {},
      "lc_messages": "C",
      "libpq_version": "18.6",
      "locale": "en_US.UTF-8",
      "log_destination": "csvlog,jsonlog",
      "log_error_verbosity": "verbose",
      "log_min_error_statement": "error",
      "log_min_messages": "error",
      "logging_collector": "on",
      "machine": "arm64",
      "max_connections": "100",
      "platform": "macOS-26.6.2-arm64-arm-64bit-Mach-O",
      "psycopg_version": "3.3.5",
      "python_version": "3.14.6 (main, Jun 10 2026, 10:03:53) [Clang 21.0.0 (clang-2100.0.123.102)]",
      "server_encoding": "UTF8",
      "server_version": "18.6 (Homebrew)",
      "server_version_num": "180006",
      "target_kind": "latest",
      "wal_level": "logical"
    },
    "id": "runtime.42704-syntax-latest1.latest",
    "observed": {
      "connection_autocommit": true,
      "diagnostic": {
        "column_name": null,
        "constraint_name": null,
        "context": null,
        "datatype_name": null,
        "exception_type": "UndefinedObject",
        "internal_position": null,
        "internal_query": null,
        "message_detail": null,
        "message_hint": null,
        "message_primary": "trigger \"missing_trigger\" for table \"trigger_table\" does not exist",
        "schema_name": null,
        "severity": "ERROR",
        "severity_nonlocalized": "ERROR",
        "source_file": "trigger.c",
        "source_function": "get_trigger_oid",
        "source_line": "1409",
        "sqlstate": "42704",
        "statement_position": null,
        "table_name": null,
        "text": "trigger \"missing_trigger\" for table \"trigger_table\" does not exist"
      },
      "failed_status": "IDLE",
      "repair_status": "IDLE",
      "trigger_count": 0
    },
    "raw": "verify/results/42704-syntax-latest1/latest/raw.jsonl",
    "raw_sha256": "fba087ee2fedf564f2e7302b3c293bc31d4846b6a40a07872156c4dc9b0cdbba",
    "run_id": "42704-syntax-latest1",
    "server_version": "18.6 (Homebrew)",
    "server_version_num": 180006,
    "snippet_registry": {
      "id": "snippet-registry.42704",
      "kind": "local_artifact",
      "path": "verify/cases/42704/snippets.json",
      "sha256": "a75d3b1e067ecb419473d902d0eeae84591441a616b12fbfd796f6c4e3feb336",
      "source_role": "snippet_registry"
    },
    "status": "passed",
    "summary": "verify/results/42704-syntax-latest1/latest/summary.json",
    "summary_sha256": "e1789ad68db707a3ed5682ba37713a958186953de2dce5ade696f5120abace9e",
    "target": "latest"
  },
  "run_id": "42704-syntax-latest1",
  "runtime_id": "runtime.42704-syntax-latest1.latest",
  "server_version": "18.6 (Homebrew)",
  "status": "passed",
  "target": "latest"
}

runtimes · runtime.42704-syntax-pg10.pg10 · 10.21 (Debian 10.21-1.pgdg90+1) · passed

{
  "cases": [],
  "limits": "",
  "position": 1,
  "raw": {
    "assertions": [
      {
        "expected": "42704",
        "name": "42704 SQLSTATE",
        "observed": "42704",
        "passed": true
      },
      {
        "expected": "ERROR",
        "name": "42704 ERROR severity",
        "observed": "ERROR",
        "passed": true
      },
      {
        "expected": "trigger ... does not exist",
        "name": "missing-trigger diagnostic names trigger",
        "observed": "trigger \"missing_trigger\" for table \"trigger_table\" does not exist",
        "passed": true
      },
      {
        "expected": "IDLE",
        "name": "missing trigger leaves session usable",
        "observed": "IDLE",
        "passed": true
      },
      {
        "expected": {
          "status": "IDLE",
          "triggers": 0
        },
        "name": "real trigger lifecycle repairs object path",
        "observed": {
          "status": "IDLE",
          "triggers": 0
        },
        "passed": true
      }
    ],
    "case_manifest": {
      "id": "manifest.42704",
      "kind": "local_artifact",
      "path": "verify/cases/42704/cases.json",
      "sha256": "ac45b2c35a40efef31fd9dbf6bf283723aec24fcf5ad58841b9684a3b3412b89",
      "source_role": "case_manifest"
    },
    "cleanup": {
      "errors": [],
      "passed": true
    },
    "environment": {
      "TimeZone": "Etc/UTC",
      "backend_pid": 78,
      "binary": {},
      "connection_scope": "runner-owned localhost port",
      "current_user": "postgres",
      "docker": {
        "architecture": "arm64",
        "command": "/usr/local/bin/docker",
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sources · src.errcodes.18.6

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sources · src.calls.REL_18_6

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sources · src.calls.REL_10_23

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sources · src.missing-trigger.18.6

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sources · src.missing-trigger.10.23

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sources · src.undefined-type.18.6

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sources · src.undefined-type.10.23

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sources · src.undefined-role.18.6

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sources · src.undefined-role.10.23

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sources · src.undefined-constraint.18.6

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sources · src.undefined-constraint.10.23

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sources · src.undefined-opclass.18.6

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sources · src.undefined-opclass.10.23

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sources · manifest.42704

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sources · snippet-registry.42704

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来源引用

原始手册引用

完整定义与证据 JSON

定义来源

center · PostgreSQL 18 · english-manuals:758dd9eb66b5c3e782f6946de46cb7bd886fa52afd48ca4e3a8bfae24e29577b

正文语言: zh-Hans · english-manuals:758dd9eb66b5c3e782f6946de46cb7bd886fa52afd48ca4e3a8bfae24e29577b