MySQL basic operation and comprehensive instance project based on MySQL basic operation

MySQL The basic operation of database is based on MySQL Comprehensive instance project of basic database operation

1、 Log in MySQL database

Log in MySQL database ：

C:\WINDOWS\system32>MySQL -u root -p
Enter password: ******
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 25
Server version: 8.0.29 MySQL Community Server - GPL

Copyright (c) 2000, 2022, Oracle and/or its affiliates.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql>

1、 Create database

To create a database is to divide an area on the system disk for data storage and management .
If the administrator creates a database for the user when setting permissions , Can be used directly , otherwise , You need to create your own database .
MySQL Basic steps for creating a database in SQL The grammar format is ：

CREATE DATABASE database_name;

Create a db_database The database of , As shown below

CREATE DATABASE db_database;

2、 Delete database

To delete a database is to clear an existing database from disk space , After clearing , All the data in the database will also be deleted , The delete database statement is similar to the command to create the database ,MySQL The basic syntax format of deleting database in is ：

DROP DATABASE database_name;

Create a db_database The database of , As shown below

DROP DATABASE db_database;

3、 Comprehensive case —— Database creation and deletion

requirement ： Use database operation statements to create 、 View and delete databases , The requirements are as follows ：
1： Create database zoo：
2： Select the current database as zoo：
3： view the database zoo Information about ：
4： Delete database zoo：

The operation process ：

cmd Environment creating and deleting databases

1： Create database zoo：

Before creating the database , stay cmd Login first in the environment MySQL, As shown below ：

C:\WINDOWS\system32>mysql -u root -p
Enter password: ******
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 16
Server version: 8.0.29 MySQL Community Server - GPL

Copyright (c) 2000, 2022, Oracle and/or its affiliates.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql>

Create database zoo Of SQL The statement is as follows ：

mysql> CREATE DATABASE zoo;
Query OK, 1 row affected (0.01 sec)

2： Select the current database as zoo：

Select the current database as zoo Of SQL The statement is as follows ：

mysql> USE zoo;
Database changed

3： view the database zoo Information about ：

view the database zoo Of information SQL The statement is as follows ：

mysql> SHOW CREATE DATABASE zoo \G;
*************************** 1. row ***************************
       Database: zoo
Create Database: CREATE DATABASE `zoo` /*!40100 DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci */ /*!80016 DEFAULT ENCRYPTION='N' */
1 row in set (0.00 sec)

4： Delete database zoo：

Delete database zoo Of SQL The statement is as follows ：

mysql> DROP DATABASE zoo;
Query OK, 0 rows affected (0.01 sec)

The results are shown in the following figure ：

use Navicat Create and delete databases

Get into Navicat Good software , Create a new query to create a database .
Write the following in the query SQL sentence , As shown below .

-- 1： Create database zoo：
CREATE DATABASE zoo;

-- 2： Select the current database as zoo：
 USE zoo;

-- 3： view the database zoo Information about ：
SHOW CREATE DATABASE zoo\G;

-- 4： Delete database zoo：
 DROP DATABASE zoo;

The operation process is as follows
1、 choice CREATE DATABASE zoo; Of SQL sentence , As shown in the figure below

2、 choice USE zoo; Of SQL sentence , As shown in the figure below

3、 choice SHOW CREATE DATABASE zoo; Of SQL sentence , As shown in the figure below

4、 choice DROP DATABASE zoo; Of SQL sentence , As shown in the figure below

summary

This paper mainly introduces the creation and deletion of database SQL sentence ：
CREATE DATABASE database_name and
DROP DATABASE database_name;
So that readers can quickly master MySQL The basic usage of creating and deleting databases in databases . In addition, it also introduces the use of cmd The environment create 、 Delete database and Navicat Create... In the environment 、 How to delete the database .