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标题：PostgreSQL查询一个表相关的所有oid

作者：惜分飞©版权所有[未经本人同意,不得以任何形式转载,否则有进一步追究法律责任的权利.]

在pg中查询一个表相关的所有oid(表OID、TOAST表OID、索引OID、TOAST表的索引OID、约束OID)

-- 替换这里的表名和模式名
\set search_path = public;
\set table_name '\'AO_6384AB_DISCOVERED\''
\set schema_name '\'public\''

WITH table_info AS (
    -- 基础表信息：表OID
    SELECT
        c.oid AS table_oid,
        c.relname AS table_name,
        c.reltoastrelid AS toast_oid,
        n.nspname AS schema_name
    FROM
        pg_catalog.pg_class c
    JOIN
        pg_catalog.pg_namespace n ON c.relnamespace = n.oid
    WHERE
        c.relname = :table_name
        AND n.nspname = :schema_name
        AND c.relkind = 'r'
),
index_info AS (
    -- 索引信息：索引OID
    SELECT
        t.table_oid,
        i.oid AS object_oid,
        i.relname AS object_name,
        'index' AS object_type
    FROM
        pg_catalog.pg_class i
    JOIN
        pg_catalog.pg_index idx ON i.oid = idx.indexrelid
    JOIN
        table_info t ON idx.indrelid = t.table_oid
    WHERE
        i.relkind = 'i'
),
toast_info AS (
    -- TOAST表信息：TOAST表OID
    SELECT
        t.table_oid,
        t.toast_oid AS object_oid,
        c.relname AS object_name,
        'toast_table' AS object_type
    FROM
        table_info t
    JOIN
        pg_catalog.pg_class c ON t.toast_oid = c.oid
    WHERE
        t.toast_oid <> 0
),
toast_index_info AS (
    -- TOAST索引信息：TOAST表的索引OID
    SELECT
        t.table_oid,
        i.oid AS object_oid,
        i.relname AS object_name,
        'toast_index' AS object_type
    FROM
        table_info t
    JOIN
        pg_catalog.pg_class c ON t.toast_oid = c.oid
    JOIN
        pg_catalog.pg_index idx ON c.oid = idx.indrelid
    JOIN
        pg_catalog.pg_class i ON idx.indexrelid = i.oid
    WHERE
        t.toast_oid <> 0
        AND i.relkind = 'i'
),
constraint_info AS (
    -- 约束信息：约束OID
    SELECT
        t.table_oid,
        con.oid AS object_oid,
        con.conname AS object_name,
        CASE con.contype
            WHEN 'p' THEN 'primary_key'
            WHEN 'u' THEN 'unique_constraint'
            WHEN 'f' THEN 'foreign_key'
            WHEN 'c' THEN 'check_constraint'
            ELSE 'other_constraint'
        END AS object_type
    FROM
        pg_catalog.pg_constraint con
    JOIN
        table_info t ON con.conrelid = t.table_oid
)
-- 合并所有结果，先输出表本身的信息，再输出其他关联对象
SELECT
    t.table_oid AS object_oid,
    t.table_name AS object_name,
    'table' AS object_type,
    t.schema_name AS schema_name
FROM
    table_info t
UNION ALL
SELECT
    object_oid,
    object_name,
    object_type,
    (SELECT schema_name FROM table_info) AS schema_name
FROM
    index_info
UNION ALL
SELECT
    object_oid,
    object_name,
    object_type,
    (SELECT schema_name FROM table_info) AS schema_name
FROM
    toast_info
UNION ALL
SELECT
    object_oid,
    object_name,
    object_type,
    (SELECT schema_name FROM table_info) AS schema_name
FROM
    toast_index_info
UNION ALL
SELECT
    object_oid,
    object_name,
    object_type,
    (SELECT schema_name FROM table_info) AS schema_name
FROM
    constraint_info
ORDER BY
    object_type;