How to view comments in mysql table

How to view comments in mysql tables: 1. View the comments of all tables through the "information_schema.TABLES" statement; 2. Query the comments of all tables and fields through the "information_schema. TABLES a LEFT JOIN..." statement Notes etc.

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Mysql View table comments or field comments

View the comments of all tables

SELECT
table_name 表名,
table_comment 表说明
FROM
information_schema.TABLES
WHERE
table_schema = '数据库名'
ORDER BY
table_name

Query the comments of all tables and fields

SELECT
a.table_name 表名,
a.table_comment 表说明,
b.COLUMN_NAME 字段名,
b.column_comment 字段说明,
b.column_type 字段类型,
b.column_key 约束
FROM
information_schema. TABLES a
LEFT JOIN information_schema. COLUMNS b ON a.table_name = b.TABLE_NAME
WHERE
a.table_schema = '数据库名'
ORDER BY
a.table_name

Query the comments of all fields of a table

select 
COLUMN_NAME 字段名,
column_comment 字段说明,
column_type 字段类型,
column_key 约束 from information_schema.columns 
where table_schema = '数据库名'
and table_name = '表名' ;

or

show full columns from 表名;

View DDL generated by the table

Note that the table name does not include single quotes

show create table 表名;

Create a new table and add comments for tables and fields

create table t_user(
    ID INT(19) primary key auto_increment  comment '主键',
    NAME VARCHAR(300) comment '姓名',
    CREATE_TIME date comment '创建时间'
)comment  = '用户信息表';

Modify comments for tables/fields

Modify table comments

alter table t_user comment  = '修改后的表注释信息(用户信息表)';

Modify field comments

alter table t_user modify column id int comment '主键ID';

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