MySQL建表时添加备注以及查看某一张表的备注信息

建表的时候对列和表明添加备注：

DROP TABLE IF EXISTS test_table;

CREATE TABLE test_table (
	ID INTEGER AUTO_INCREMENT PRIMARY KEY COMMENT '主键',
	NAME VARCHAR(20) COMMENT '姓名'
) COMMENT = '测试表';

查看表中列的备注信息：

SELECT
    column_name AS '列名',
    data_type   AS '数据类型',
    character_maximum_length  AS '字符长度',
    numeric_precision AS '数字长度',
    numeric_scale AS '小数位数',
    is_nullable AS '是否允许非空',
    CASE
        WHEN extra = 'auto_increment' THEN 1
        ELSE 0
    END AS '是否自增',
    column_default  AS  '默认值',
    column_comment  AS  '备注'
FROM
    information_schema.columns
WHERE
    table_name='test_table';

查看当初怎么建这张表的：

SHOW CREATE TABLE test_table;