MySQL 查询

创建数据库、数据表

创建数据库

    create database python_test_1 charset=utf8;

使用数据库

    use python_test_1;

students表

create table students(
    id int unsigned primary key auto_increment not null,
    name varchar(20) default '',
    age tinyint unsigned default 0,
    height decimal(5,2),
    gender enum('男','女','中性','保密') default '保密',
    cls_id int unsigned default 0,
    is_delete bit default 0
);

classes表

create table classes (
    id int unsigned auto_increment primary key not null,
    name varchar(30) not null
);

准备数据

向students表中插入数据

insert into students values
(0,'小明',18,180.00,2,1,0),
(0,'小月月',18,180.00,2,2,1),
(0,'彭于晏',29,185.00,1,1,0),
(0,'刘德华',59,175.00,1,2,1),
(0,'黄蓉',38,160.00,2,1,0),
(0,'凤姐',28,150.00,4,2,1),
(0,'王祖贤',18,172.00,2,1,1),
(0,'周杰伦',36,NULL,1,1,0),
(0,'程坤',27,181.00,1,2,0),
(0,'刘亦菲',25,166.00,2,2,0),
(0,'金星',33,162.00,3,3,1),
(0,'静香',12,180.00,2,4,0),
(0,'郭靖',12,170.00,1,4,0),
(0,'周杰',34,176.00,2,5,0);

向classes表中插入数据

insert into classes values (0, "python_01期"), (0, "python_02期");

查询所有字段

select * from 表名;
例：
select * from students;

查询指定字段

select 列1,列2,... from 表名;
例:
select name from students;

python 人工智能基础 15 day

MySQL 查询