Frequently asked questions about MySQL

1. Summary

In the process of learning , We often encounter the situation of operating the database , And what we usually use most is mysql database , But in use mysql There will be all kinds of problems in the process of , In order to avoid the same problem, we can solve it quickly , The following is a summary of some problems I usually encounter .

2. forget mysq Password solution

1. stop it mysql service
net stop mysql

2, function cmd, Switch to mysql Of bin Catalog , Run the command
mysqld --skip-grant-tables

3. Open the second cmd2 window , Connect mysql, When prompted for a password , Directly enter
mysql -u root -p

4. view the database , Switch database
show databases;
use mysql;

5. change root password
UPDATE user SET Password=PASSWORD(‘newpassword’) where USER=‘root’;

6. Refresh the permissions , Sign out and log back in
FLUSH PRIVILEGES;

7. Close the previously opened mysqld window , And end through the task manager mysqld process

8. restart mysql service
net start mysql

3 How to uninstall myql

When a new one needs to be installed myql Be sure to uninstall the previous mysql, Otherwise it will lead to myql Unable to install successfully , There are four steps in total

1. stop it mysql service
2. Open the control panel -> Uninstall program -> uninstall mysql
3. Delete the remaining mysql The installation directory :C:\Program Files\MySQL
4. Delete data directory :C:\ProgramData\MySQL