運維筆記--postgresql查看表結構、表名、字段類型、字段注釋

連接數據庫服務器，切換至postgres(或其他數據庫用戶)下，

psql--進入數據庫命令行終端，執行如下相關查詢操作：

顯示數據庫：

\l

連接指定的數據庫：

\c 數據庫名

查看當前實例下的表：

\dt

用sql語句方式查詢：

SELECT tablename FROM pg_tables;  

查詢某張表的表結構及字段信息

\d tablename--實際表名

用sql語句方式查詢：

SELECT a.attnum, a.attname AS field, t.typname AS type, a.attlen AS length, a.atttypmod AS lengthvar
    , a.attnotnull AS notnull, b.description AS comment
FROM pg_class c, pg_attribute a
    LEFT JOIN pg_description b
    ON a.attrelid = b.objoid
        AND a.attnum = b.objsubid, pg_type t
WHERE c.relname = '實際的表名'
    AND a.attnum > 0
    AND a.attrelid = c.oid
    AND a.atttypid = t.oid
ORDER BY a.attnum;