openGauss数据库-表管理3

1.创建表和约束

omm=# create table t1(id bigint,name varchar(50) not null,age int default 20,primary key(id));
NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index “t1_pkey” for table “t1”
CREATE TABLE

2.使用\d tableNmae命令查看表的定义、模式和所有者

omm=# \d t1
Table “public.t1”
Column | Type | Modifiers
--------±----------------------±-----------
id | bigint | not null
name | character varying(50) | not null
age | integer | default 20
Indexes:
“t1_pkey” PRIMARY KEY, btree (id) TABLESPACE pg_default

3.查看某个模式下有哪些表

 table_name 
------------
 t1
(1 row)

4.查看一个表下有哪些约束

omm=# select conname, connamespace, contype, conkey from pg_constraint where conrelid in ( select oid from pg_class where relname=‘t1’);
conname | connamespace | contype | conkey
---------±-------------±--------±-------
t1_pkey | 2200 | p | {1}
(1 row)

5.查看一个表属于数据库的哪个模式

omm=# SELECT * FROM information_schema.tables WHERE table_name=‘t1’;
table_catalog | table_schema | table_name | table_type | self_referencing_column_name | reference_generation | user_defined_type_catalog | user_defined_type_schema | u
ser_defined_type_name | is_insertable_into | is_typed | commit_action
---------------±-------------±-----------±-----------±-----------------------------±---------------------±--------------------------±-------------------------±-
----------------------±-------------------±---------±--------------
omm | public | t1 | BASE TABLE | | | | |
| YES | NO |
(1 row)

原文：https://www.hikunpeng.com/forum/thread-0228106387690819108-1-1.html