12-MySQL-Ubuntu-数据表的查询-数据准备和基本查询(一)

一,数据准备

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");