运维笔记--postgresql查看表结构、表名、字段类型、字段注释

链接数据库服务器，切换至postgres(或其余数据库用户)下，

psql--进入数据库命令行终端，执行以下相关查询操做：

显示数据库：

\l

链接指定的数据库：

\c 数据库名

查看当前实例下的表：

\dt

用sql语句方式查询：

SELECT tablename FROM pg_tables;

查询某张表的表结构及字段信息

\d tablename--实际表名

用sql语句方式查询：

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 = '实际的表名'
    AND a.attnum > 0
    AND a.attrelid = c.oid AND a.atttypid = t.oid ORDER BY a.attnum;