How to view comments in mysql table-Mysql Tutorial-php.cn

How to view comments in mysql table

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Release： 2021-04-18 13:00:17

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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.

How to view comments in mysql table

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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 = &#39;数据库名&#39;
ORDER BY
table_name

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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 = &#39;数据库名&#39;
ORDER BY
a.table_name

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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 = &#39;数据库名&#39;
and table_name = &#39;表名&#39; ;

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show full columns from 表名;

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View DDL generated by the table

Note that the table name does not include single quotes

show create table 表名;

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Create a new table and add comments for tables and fields

create table t_user(
    ID INT(19) primary key auto_increment  comment &#39;主键&#39;,
    NAME VARCHAR(300) comment &#39;姓名&#39;,
    CREATE_TIME date comment &#39;创建时间&#39;
)comment  = &#39;用户信息表&#39;;

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Modify comments for tables/fields

Modify table comments

alter table t_user comment  = &#39;修改后的表注释信息(用户信息表)&#39;;

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Modify field comments

alter table t_user modify column id int comment &#39;主键ID&#39;;

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