mysql query table and table fields

information_schema.tables database table

information_schema.columns database table attributes

1. Get all tables in the database

select table_name as '表名',table_comment '描述' 
from information_schema.tables 
where table_schema='exchange' order by table_name desc;

2. Query all fields of the table

select column_name as '表名',column_name as '列名',data_type as '类型', column_comment as '标识' 
from information_schema.columns 
where table_schema = 'exchange' and table_name = 'contents';

3 , query the specified type of field

select column_name as '表名',column_name as '列名',data_type as '类型', column_comment as '标识' 
from information_schema.columns 
where table_schema = 'exchange' and table_name = 'contents' and DATA_TYPE in('varchar','longtext','text','char');