How to add field comments to mysql table

How to add field comments to mysql table: add fields directly when creating the table, the code is [CREATE TABLE userinfo(id INT COMMENT 'number',uname VARCHAR(40) COMMENT 'username',].

How to add field comments to mysql table:

Directly post the code and case

#创建表的时候写注释
CREATE TABLE userinfo(
id INT COMMENT '编号',
uname VARCHAR(40) COMMENT '用户名',
address VARCHAR(120) COMMENT '家庭住址',
hobby VARCHAR(200) COMMENT '爱好'
 
)COMMENT = '用户信息表';
 
#修改表的注释
ALTER TABLE userinfo COMMENT '用户信息资料表';
 
#修改字段的注释，注意：字段名和字段类型照写就行
ALTER TABLE userinfo MODIFY COLUMN uname VARCHAR(40) COMMENT '姓名';
 
#查看表注释的方法，在生成的SQL语句中看
SHOW CREATE TABLE userinfo;
#在元数据的表里面看
USE information_schema;
SELECT * FROM TABLES WHERE TABLE_SCHEMA='shoppingcart' AND TABLE_NAME='userinfo';
 
#查看字段注释的方法
SHOW FULL COLUMNS FROM userinfo;
#在元数据的表里面看
SELECT * FROM COLUMNS WHERE TABLE_SCHEMA='shoppingcart' AND TABLE_NAME='userinfo';

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