MySQL查询表与表字段的信息

Mysql数据库
库名：db_name
表名： table_name1 table_name2

use information_scheam;
select * from tables where table_schema = "db_name";

use information_scheam;
select * from tables where table_schema = "db_name" and table_name = "table_name1";

use db_name;
show full columns from table_name1;
show full columns from table_name2;

# 创建表
create table book(
    id int(11) primary key,
    title varchar(50) comment ‘书名‘,
    author varchar(32) comment ‘作者‘,
    price int(8) comment ‘价格‘
);

# 修改表备注信息
alter table student comment ‘书籍表‘;

# 修改表字段长度
alter table book modify column author varchar(50);

# 修改表字段备注信息
alter table book modify column author varchar(50) comment ‘作者姓名‘;

# 给表增加新字段
alter table book add publisher varchar(100) comment ‘出版社‘;

# 在指定列后面增加新字段
alter table book add publisher varchar(200) comment ‘出版社‘ after author;

# 删除表字段
alter table book drop column price;

# 查看表备注信息和表字段备注信息请看上文。