mysql使用sql语句查询数据库所有表注释等

1、/* 查询数据库 test 所有表注释 */

SELECT TABLE_NAME,TABLE_COMMENT FROM information_schema.TABLES WHERE table_schema='test';

2、要查询表字段的注释

SELECT COLUMN_NAME,column_comment FROM INFORMATION_SCHEMA.Columns WHERE table_name='class' AND table_schema='test';

3、一次性查询数据库 "test" 下表注释以及对应表字段注释

SELECT t.TABLE_NAME,t.TABLE_COMMENT,c.COLUMN_NAME,c.COLUMN_TYPE,c.COLUMN_COMMENT FROM information_schema.TABLES t,INFORMATION_SCHEMA.Columns c WHERE c.TABLE_NAME=t.TABLE_NAME AND t.`TABLE_SCHEMA`='test';

4、项目中使用的，查询数据库所有表的相关字段，属性

SELECT 
    'xx系统' system_name,
    table_comment table_comment,
    a.table_name,
    column_comment,
    column_name,
    CASE WHEN column_key ='PRI' THEN 'Y' ELSE 'N' END is_key,
    CASE WHEN column_name='id' OR column_name='created_by' THEN '自动' ELSE '手动' END get_type,
    column_type
FROM (SELECT * FROM information_schema.COLUMNS WHERE table_schema ='test')a
    LEFT JOIN (SELECT table_name,table_comment FROM information_schema.TABLES WHERE table_schema='test') b
    ON a.table_name = b.table_name
    ORDER BY table_name,ordinal_position ;