Generate 4 digit random PIN number in MySQL

I recently came across a problem where I had to update hundreds of client records with a random 4 digit PIN code. After some research, I wrote the following SQL which did the trick.

It will update all records on the table: table_name and set a random 4 digit PIN between 1,000 and 9,999 on the column `column_pin`.

UPDATE `table_name` SET `column_pin` = FLOOR( 1000 + ( RAND( ) *8999 ) ) ;

 

I hope this was helpful to you.

How do I restore a MySQL dump?

If you have an all-database MySQL dump, follow the instructions below to restore your SQL file with all database data & privileges.

Please note that the following procedures require command line access and is assuming you are the administrator of the computer.

Step 1:
Open up command line.
Start > Run > Type ‘cmd’ > Enter

Step 2:
Change directory to your MySQL bin folder. This can be C:Program FilesMySQLMySQL 4.1 Serverbin — or C:xamppmysqlbin depending on what your setup is like. You can do so by the ‘cd’ command as follows:

cd C:xamppmysqlbin

Step 3:
Ensure that you have moved your backup file (eg: db_backup.sql) into the bin folder and run the following command where test is an empty MySQL database.

mysql -u root -p test < db_backup.sql

It will prompt you for your root password. Enter that and it will start importing your SQL file. It can take several minutes depending on how big your SQL file is.

Good luck!

How to backup MySQL server?

Recently, I bought a new laptop and was challenged to move my development sites over. Copying files and sites is all pretty easy, however, if you do not backup your MySQL server correctly – you will face quite a hassle recreating all the databases and privileges.

I came across the following way that was pretty easy to move around 150 databases with their privileges swiftly.

Please note that the following procedures require command line access and is assuming you are the administrator of the computer.

Step 1:
Open up command line.
Start > Run > Type ‘cmd’ > Enter

Step 2:
Change directory to your MySQL bin folder. This can be C:Program FilesMySQLMySQL 4.1 Serverbin — or C:xamppmysqlbin depending on what your setup is like. You can do so by the ‘cd’ command as follows:

cd C:xamppmysqlbin

Step 3:
Type in the following command to dump all databases into an sql file.

mysqldump –all-databases > db_backup.sql

This can take several minutes depending on the size of your databases. Once done, check your bin folder for db_backup.sql file which contains SQL queries of your entire MySQL server.

You may want to see my other post regarding restoring MySQL server.