DM、Oracle、GaussDB、Kingbase8(人大金仓数据库)和HIVE给列增加注释-编程知识

DM、Oracle、GaussDB、Kingbase8(人大金仓数据库)和HIVE给列增加注释

DM数据库给列增加注释

1、创建表

CREATE TABLE test222

(

id int NOT NULL PRIMARY KEY,

name varchar(1000) DEFAULT NULL,

email varchar(1000) DEFAULT NULL,

phone varchar(1000) DEFAULT NULL

)

2、给列添加注释

comment on column TEST222.NAME is '这是一个列注释';

例如：

comment on column TEST222.NAME is '姓名';

comment on column TEST222.EMAIL is '邮箱';

comment on column TEST222.PHONE is '电话';

Oracle

1、创建表

create table student(
id int primary key,
name varchar2(1000),
email varchar2(1000),
phone varchar2(1000)
)

2、给列添加注释

comment on column student.name is '姓名';

comment on column student.email is '邮箱';

comment on column student.phone is '电话';

comment on table student is '测试表'

GaussDB

openGauss和postgressql的SQL类似

1、创建表

CREATE TABLE test.student(

id int,

name varchar(1000),

email varchar(1000),

phone varchar(1000)

)

2、添加备注

COMMENT ON COLUMN test.student."id" IS '编号';

COMMENT ON COLUMN test.student."name" IS '名称';

COMMENT ON COLUMN test.student."email" IS '邮箱';

COMMENT ON COLUMN test.student."phone" IS '手机';

参考：PostgreSQL 创建表时如何为列添加注释|极客笔记 (deepinout.com)

Kingbase8(人大金仓数据库)给列增加备注

1、创建表

CREATE TABLE test (
   id int,
   name varchar(1000) ,
   email varchar(1000) ,
   phone varchar(1000) ,
   CONSTRAINT test_pkey PRIMARY KEY (id)
);

2、给列添加注释

单独执行sql添加注释：comment ON column 表名.列名 is '注释';

例如：

comment ON column regre.public.test.name is '名称';

comment ON column regre.public.test.email is '邮箱';

comment ON column regre.public.test.phone is '电话';

Hive修改列备注

1、创建表

CREATE TABLE test(

id int,

name varchar(1000),

email varchar(1000),

phone varchar(1000)

)

2、修改备注

alter table test change column name name varchar(1000) comment '姓名';

alter table test change column email email varchar(1000) comment '邮箱';

alter table test change column phone phone varchar(1000) comment '电话';

alter table test change column name name string comment '姓名';