MySQL建表語句+添加注釋

1.建表+注釋

CREATE TABLE student(
  id INT PRIMARY KEY AUTO_INCREMENT COMMENT '學號',
  name VARCHAR(200) COMMENT '姓名',
  age    int COMMENT '年齡'
) COMMENT='學生信息'

2.修改注釋

修改表注釋-ALTER TABLE student COMMENT '學生表';
                    
修改列注釋-ALTER TABLE student MODIFY COLUMN name VARCHAR(100) COMMENT '姓名';

SELECT table_name,table_comment FROM information_schema.tables  WHERE table_schema = '所在的db' AND table_name ='表名groups'
SHOW FULL COLUMNS FROM groups
-- 這個可以按條件的去搜索某名字或某數據類型的列的信息：例如
SHOW FULL COLUMNS FROM tableName WHERE FIELD = 'add_time' OR TYPE LIKE '%date%' -- 查看tableName表中列名是add_time的或類型是date的列
SELECT  column_name, column_comment FROM information_schema.columns WHERE table_schema ='db'  AND table_name = 'groups'
SHOW  CREATE TABLE communication_group

3. 查看方法：

 方法1：show full fields from '表名稱'; //把所有信息都輸出

 方法2：show create table gbox;

修改表的comment項（如修改gbox表）：

 alter table  gbox COMMENT = 'new information';

修改數據庫表的某列(name)的COMMENT:

　　alter table gbox change COLUMN name name datatype COMMENT 'new column commen