1. 獲取表中普通訊息：如欄位名，欄位型別等

SELECT column_name,data_type,ordinal_position,is_nullable 
FROM information_schema."columns"
WHERE "table_name"='TABLE-NAME' -- 將 'TABLE-NAME' 換成自己的表

2.獲取所有的表和檢視

SELECT table_name,table_type FROM INFORMATION_SCHEMA.tables WHERE table_schema='public' AND table_type IN ('BASE TABLE','VIEW')

3.獲取約束註釋

SELECT obj_description(oid,'pg_constraint') AS d FROM pg_constraint WHERE conname = constraint_name;

4.獲取表的約束

-- conname 約束名稱
-- contype 約束型別(p:主鍵,f:外來鍵,c: 檢查約束,u:唯一約束)
-- conkey 約束欄位
-- confkey 外來鍵欄位
-- consrc 檢查約束條件
-- confreltable 外來鍵欄位引用的表
SELECT conname,contype,conkey,consrc,(SELECT array_agg(column_name::text) FROM INFORMATION_SCHEMA.COLUMNS WHERE ordinal_position = any(conkey) AND table_name= 'TABLE-NAME') AS conkey,(SELECT column_name FROM INFORMATION_SCHEMA.COLUMNS WHERE ordinal_position = any(confkey) AND table_name='TABLE-NAME') AS confkey,(SELECT relname FROM pg_class WHERE oid = confrelid) AS confreltable
FROM pg_constraint WHERE conrelid=(SELECT oid FROM pg_class WHERE relname ='TABLE-NAME'); -- 將 'TABLE-NAME' 換成自己的表

5.獲取表的觸發器

SELECT trigger_name,event_manipulation,event_object_table,action_statement,action_orientation,action_timing FROM INFORMATION_SCHEMA.TRIGGERS;

6.獲取欄位的註釋

--table_oid 表的oid
--col_position 欄位的位置
SELECT col_description(table_oid,col_position);

補充：查詢PostgreSQL庫中所有表的表結構資訊SQL

我就廢話不多說了，大家還是直接看程式碼吧~

select
(select relname as comment from pg_class where oid=a.attrelid) as table_name,row_number() over(partition by (select relname as comment from pg_class where oid=a.attrelid) order by a.attnum),a.attname as column_name,format_type(a.atttypid,a.atttypmod) as data_type,(case when atttypmod-4>0 then atttypmod-4 else 0 end)data_length,(case when (select count(*) from pg_constraint where conrelid = a.attrelid and conkey[1]=attnum and contype='p')>0 then '是' else '否' end) as 主鍵約束,(case when (select count(*) from pg_constraint where conrelid = a.attrelid and conkey[1]=attnum and contype='u')>0 then '是' else '否' end) as 唯一約束,(case when (select count(*) from pg_constraint where conrelid = a.attrelid and conkey[1]=attnum and contype='f')>0 then '是' else '否' end) as 外來鍵約束,(case when a.attnotnull=true then '是' else '否' end) as nullable,col_description(a.attrelid,a.attnum) as comment
from pg_attribute a
where attstattarget=-1 and attrelid in (select oid from pg_class where relname in(select relname from pg_class where relkind ='r' and relname 
in 
(select tablename from pg_tables where tablename not like 'pg_%' and tablename not like 'sql_%' and schemaname not in(XXXX) and tablename not in(XXXX)
))
order by table_name,a.attnum;

以上為個人經驗，希望能給大家一個參考，也希望大家多多支援我們。如有錯誤或未考慮完全的地方，望不吝賜教。