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p43 数据库的备份与还原

C:\Windows\System32>mysqldump -uroot -p123456 db1 > E://a.sqlmysqldump: [Warning] Using a password on the command line interface can be insecure.C:\Windows\System32>

mysql> show databases;ERROR 2006 (HY000): MySQL server has gone awayNo connection. Trying to reconnect...Connection id:    29Current database: *** NONE ***+--------------------+| Database           |+--------------------+| db1                || information_schema || mysql              || performance_schema || sakila             || ssm_crud           || sys                || test               || world              |+--------------------+9 rows in set (0.13 sec)mysql> drop database db1;Query OK, 9 rows affected (4.20 sec)mysql> show databases;+--------------------+| Database           |+--------------------+| information_schema || mysql              || performance_schema || sakila             || ssm_crud           || sys                || test               || world              |+--------------------+8 rows in set (0.00 sec)mysql> create database db1;Query OK, 1 row affected (0.08 sec)mysql> use db1;Database changedmysql> source E://a.sqlQuery OK, 0 rows affected (0.02 sec)Query OK, 0 rows affected (0.02 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.01 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.02 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.01 sec)Query OK, 0 rows affected, 1 warning (0.54 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.03 sec)Query OK, 1 row affected (0.06 sec)Query OK, 0 rows affected (0.04 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.04 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected, 3 warnings (0.74 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.02 sec)Query OK, 3 rows affected (0.13 sec)Records: 3  Duplicates: 0  Warnings: 0Query OK, 0 rows affected (0.11 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.01 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected, 1 warning (0.47 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.08 sec)Query OK, 2 rows affected (0.09 sec)Records: 2  Duplicates: 0  Warnings: 0Query OK, 0 rows affected (0.07 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.04 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected, 3 warnings (0.33 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.06 sec)Query OK, 3 rows affected (0.10 sec)Records: 3  Duplicates: 0  Warnings: 0Query OK, 0 rows affected (0.20 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.01 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected, 4 warnings (0.36 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.01 sec)Query OK, 8 rows affected (0.09 sec)Records: 8  Duplicates: 0  Warnings: 0Query OK, 0 rows affected (0.17 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.04 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected, 1 warning (0.77 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.11 sec)Query OK, 0 rows affected (0.03 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.06 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected, 2 warnings (1.75 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.12 sec)Query OK, 0 rows affected (0.04 sec)Query OK, 0 rows affected (0.10 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.02 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected, 2 warnings (0.76 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.04 sec)Query OK, 0 rows affected (0.01 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.02 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected, 1 warning (0.81 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.06 sec)Query OK, 0 rows affected (0.02 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected, 1 warning (0.02 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.03 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)Query OK, 0 rows affected (0.00 sec)mysql> show tables;+---------------+| Tables_in_db1 |+---------------+| department    || employee      || stu           || stuback       || student       || tab_category  || tab_favorite  || tab_route     || tab_user      |+---------------+9 rows in set (0.16 sec)

p44 今日内容

p45 多表查询——概述

CREATE DATABASE db2;-- 新建部门表CREATE TABLE dept(	id INT PRIMARY KEY AUTO_INCREMENT,	NAME VARCHAR(20))INSERT INTO dept(NAME) VALUES ('开发部'),('市场部'),('财务部');-- 新建员工表CREATE TABLE emp(	id INT PRIMARY KEY AUTO_INCREMENT,	NAME VARCHAR(10),	gender CHAR(1),	salary DOUBLE,	join_date DATE,	dept_id INT,	FOREIGN KEY (dept_id) REFERENCES dept(id) )INSERT INTO emp(NAME,gender,salary,join_date,dept_id) VALUES('孙悟空','男',7200,'2013-02-24',1);INSERT INTO emp(NAME,gender,salary,join_date,dept_id) VALUES('猪八戒','男',3600,'2010-12-02',2);INSERT INTO emp(NAME,gender,salary,join_date,dept_id) VALUES('唐僧','男',9000,'2008-08-08',2);INSERT INTO emp(NAME,gender,salary,join_date,dept_id) VALUES('白骨精','女',5000,'2015-10-07',3);INSERT INTO emp(NAME,gender,salary,join_date,dept_id) VALUES('蜘蛛精','女',4500,'2011-03-14',1);

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