MySQL建表時添加備注以及查看某一張表的備注信息

建表的時候對列和表明添加備注：

DROP TABLE IF EXISTS test_table;

CREATE TABLE test_table (
	ID INTEGER AUTO_INCREMENT PRIMARY KEY COMMENT '主鍵',
	NAME VARCHAR(20) COMMENT '姓名'
) COMMENT = '測試表';

查看表中列的備注信息：

SELECT   
    column_name AS '列名',  
    data_type   AS '數據類型',   
    character_maximum_length  AS '字符長度',   
    numeric_precision AS '數字長度',       
    numeric_scale AS '小數位數',   
    is_nullable AS '是否允許非空',   
    CASE   
        WHEN extra = 'auto_increment' THEN 1
        ELSE 0   
    END AS '是否自增',   
    column_default  AS  '默認值',   
    column_comment  AS  '備注'   
FROM   
    information_schema.columns   
WHERE   
    table_name='test_table';

查看當初怎么建這張表的：

SHOW CREATE TABLE test_table;