Databases on Aamnah - Frontend Web Developer

Getting started with PostgreSQL on Ubuntu

Sat, 18 Feb 2023 19:53:34 +0500

 1# PostgreSQL comes pre-installed on Ubuntu
 2sudo apt install postgresql postgresql-contrib
 3
 4# Start PostgreSQL
 5sudo systemctl start postgresql.service
 6
 7# create a user and give it super privileges
 8sudo -u postgres createuser --interactive
 9
10# create a db with the same username that postgres access by default
11# this DID NOT work for me..
12sudo -u postgres createdb sammy

PostgreSQL commands

Make sure you end all commands with a semicolon ;
Users are actually called roles

\l - list all databases
 - list all users
\q - exit out of the prompt

 1-- create a database
 2CREATE DATABASE [IF NOT EXISTS] db_name;
 3
 4-- connect to a database
 5\c database_name;
 6
 7-- drop a database permanently
 8DROP DATABASE [IF EXISTS] db_name;
 9
10-- create a role
11CREATE ROLE role_name;
12
13-- create a role with username and password
14CREATE ROLE username NOINHERIT LOGIN PASSWORD password;
15
16-- set a password for an existing user
17ALTER USER postgres PASSWORD 'myPassword';

You need a linux user with the same name as the postgresql user and database
TablePlus will refuse to connect without a password
PostgreSQL is fussy about using single commas ' instead of doubles
For escape characters to work, you need to prepend the text with E. For example: E'Ocean\'s Eleven'

Sample commands

CREATE TABLE creates a new table.
INSERT INTO adds a new row to a table.
SELECT queries data from a table.
ALTER TABLE changes an existing table.
UPDATE edits a row in a table.
DELETE FROM deletes rows from a table.

1-- create a database
2CREATE TABLE celebs (
3   id INTEGER,
4   name TEXT,
5   age INTEGER
6 );

Auto-increment values with SEQUEL constraint. SEQUEL represents an auto-incrementing unique value. For example: id SERIAL PRIMARY KEY.

Enable logs (general, error, slow query) for Amazon RDS databases (MySQL, MariaDB)

Fri, 19 Mar 2021 12:44:37 +0500

Log locations are:

Error: /rdsdbdata/log/error/mysql-error.log
General: /rdsdbdata/log/general/mysql-general.log
Slow Query: /rdsdbdata/log/slowquery/mysql-slowquery.log

MariaDB logs are also named mysql-slowquery.log and mysql-general.log. These file locations (or names) can not be changed.

MySQL Parameters

slow_query_log = 1 (default value is 0 or no logging)
slow_query_log_file = /rdsdbdata/log/slowquery/mysql-slowquery.log (default location)
long_query_time = 5 (to log queries that run longer than five seconds)
general_log = 1 (default value is 0 or no logging)
general_log_file = /rdsdbdata/log/general/mysql-general.log (default location)
log_output = FILE

To work with the logs from the Amazon RDS console, Amazon RDS API, Amazon RDS CLI, or AWS SDKs, set the log_output parameter to FILE.

Finding slow MySQL queries

Thu, 21 Mar 2019 13:58:09 +0500

tl;dr

1SELECT @@GLOBAL.slow_query_log, @@GLOBAL.long_query_time, @@GLOBAL.slow_query_log_file;

Check if logging is already on

By default the slow query log is disabled, it comes with a performance hit.

 1-- get all glbal variables
 2SHOW GLOBAL VARIABLES;
 3
 4-- get values for specific variables
 5SHOW GLOBAL VARIABLES LIKE 'long_query_time';
 6-- or
 7SELECT @@GLOBAL.long_query_time;
 8
 9-- get Slow Query related values 
10SELECT @@GLOBAL.slow_query_log, @@GLOBAL.long_query_time, @@GLOBAL.slow_query_log_file;

From within mysql

Notes on Moving from MySQL to MariaDB and Replication

Thu, 07 Mar 2019 16:28:25 +0500

NOTTES

it’s easier to switch from MySQL to MariaDB

1# (Ubuntu 18.04 LTS - MariaDB 10.3 stable)
2# add repo 
3sudo apt-get install software-properties-common
4sudo apt-key adv --recv-keys --keyserver hkp://keyserver.ubuntu.com:80 0xF1656F24C74CD1D8
5sudo add-apt-repository 'deb [arch=amd64,arm64,ppc64el] http://mirror.poliwangi.ac.id/mariadb/repo/10.3/ubuntu bionic main'
6
7# install
8sudo apt update
9sudo apt install mariadb-server

Replication

we probably want a multi-source replication (multiple masters, data is combined into slaves)
Galera Cluster is better than multi-source as it has all masters and no slaves. Every node can read+write.
Slave databases are not updated in real-time (async transfers)
Slave lag is the time it takes to replicate data from master to slave
The downside for synchronous write to all masters is that it takes long to write (get an agreement between all master before changes apply)
That is why some people setup Galera Cluster, but treat other masters as slaves handling only read ops.

Galera Cluster

clustering techonology enabling active-active, true multi-master cluster. each database is a master database
Application can read+write from any database node
All database nodes contain same data (minimizing data logs)
No slave lag, no complex failovers
if one master fails, the other nodes continue to serve clients

Keywords

multi-mastter(source) replication
Topology: infrasttructure of your databaes. Two types: master-master and maser-slave.
DBMS: DataBase Management System (control panel). MySQL and Oracle etc. are DBMS

ClusterControl Setup

insall ClusterControl (will install MySQL as part of the installation process..)
the SSH user has to be the same user and same SSH password on all servers. CloudConrol only asks for one user/password, not separate users for all nodes..
Same is the case with MariaDB root passord for all nodes.. Setup your SSH keys before installing ClusterControl > MariaDB. It’ll confirm that the nodes can be reached during the install process.

Notes on Moving Large Databases

Wed, 06 Mar 2019 00:00:01 +0500

NOTES

by default, when you do a mysqldump, it locks the tables. You can change that by passing --lock-tables=false as a parameter.
take differential backups every day and full backups every week.
don’t have to sit and look at the Terminal screen and wait and wait.. Write a script, run it wth cron
36.56 GB database took 21 minues to backup, without any gzip compression.. You can use the time command to find out how long it took. The backup file was 21GB in size.
20.62 GB database took 12 minutes to backup, without any compression. Resulting file was 11 GB in size
use rsync instead of scp. scp gets stalled. rsync copies faster. use the -P flag to see progress and the ability to pause/resume file transfers
the server where these tests were done had the following specs: 2GB RAM, 2 vCPUs, 160GB HDD, 10MBps network link

Exporting

1mysqldump --user=XXX --password=XXX --single-transaction --routines --triggers --quick --all-databases > XXX.sql

--single-transaction only works with InnoDB, let’s you backup data without blocking any applications. The --single-transaction option and the --lock-tables option are mutually exclusive
--routines copies stored procedures and functions
--triggers Include triggers for each dumped table. A trigger is a named database object that is associated with a table, and that activates when a particular event occurs for the table. Some uses for triggers are to perform checks of values to be inserted into a table or to perform calculations on values involved in an update.
--quick forces mysqldump to retrieve rows for a table from the server a row at a time rather than retrieving the entire row set and buffering it in memory before writing it out.
To dump large tables, combine the --single-transaction option with the --quick option
To include stored routines and events in a dump made using --all-databases, use the --routines and --events options explicitly.
The performance_schema database, is not dumped even with the --all-databases option. You can mention it explicitly with the --databases option.
By default, it’ll lock tables when you dump, so be careful of using either --single-transaction or --skip-lock-tables option when moving live databases.

Get only stored procedures and table structure, but no data

Use the --no-data (or -d) flag to not dump table data. It’ll only dump the CREATE TABLE statement for the table (for example, to create an empty copy of the table by loading the dump file)

Find out MySQL Database sizes

Wed, 06 Mar 2019 00:00:00 +0500

1-- DB size in GB
2SELECT TABLE_SCHEMA "DB Name", ROUND(SUM(DATA_LENGTH + INDEX_LENGTH) / 1024 / 1024 / 1024, 2) "DB Size in GB" FROM INFORMATION_SCHEMA.TABLES GROUP BY TABLE_SCHEMA;
3
4-- DB size in MB
5SELECT TABLE_SCHEMA "DB Name", ROUND(SUM(data_length + INDEX_LENGTH) / 1024 / 1024, 2) "DB Size in MB" FROM INFORMATION_SCHEMA.TABLES GROUP BY TABLE_SCHEMA;

+--------------------+---------------+
| test               | DB Size in GB |
+--------------------+---------------+
| foo                |         36.56 |
| bar                |         20.62 |
| information_schema |          0.00 |
| mysql              |          0.00 |
| performance_schema |          0.00 |
+--------------------+---------------+
5 rows in set (56.61 sec)

Allowing remote access to MySQL

Fri, 27 Apr 2018 00:00:00 +0500

Allow remote access

1GRANT PRIVILEGES ON *.*
2TO 'user'@'host'
3IDENTIFIED BY 'password'
4WITH GRANT OPTION;

*.* means you’re granting access to all tables of all databases. This could be databaseName.* meaning you’re granting access to all tables of databaseName. Or you could further fine grain which specific tables of what database you want to give access to, like databaseName.tableName
host could be a wildcard % allowing access from all hosts with that user/pass combination, or it could be an IP or an FQDN

Importing ALL Gzipped databases

1mysql -uroot -pecare2@ < alldatabases.sql

For this command the databases need to exist or the alldatabases.sql script needs to contain the CREATE DATABASE queries for the databases. In order to have the CREATE DATABASE queries, you gotta dump the databases with the --add-drop-database option, like so:

Search for characters in SQL with LIKE and CONTAIN

Thu, 30 Nov 2017 00:00:00 +0500

You have two options: LIKE and CONTAINS(). CONTAINS() is supposed to be more performant
LIKE, if it starts with a wildcard, will require a full table scan
% and _ are wildcards for the LIKE operator. % represents zero, one or multiple characters. _ represents a single character (e.g. %ish will represent everything that ends in ish like Lavish, McTavish and so on)
* is a wildcard in CASE statements. e.g. *test* will find words like testing and greatest as well.
CONTAINS is not a standard SQL function. The implementation varies across servers and the required arguments vary as well.
In MySQL, CONTAINS does not work on ordinary strings (it was developed as an implementation of the OpenGIS framework and only works when dealing with spatial data, whatever that means).

LIKE operator

1SELECT * FROM table WHERE Column LIKE 'test'; -- test
2SELECT * FROM table WHERE Column LIKE 'test%'; -- test, testing, tested ..
3SELECT * FROM table WHERE Column LIKE '%test'; -- test, greatest, latest ..
4SELECT * FROM table WHERE Column LIKE '%test%'; -- test, greatest, latest, testing, tested ..
5
6SELECT * FROM table WHERE Column LIKE '_r%' -- Finds any values that have "r" in the second position e.g. Orphan
7SELECT * FROM table WHERE Column LIKE 'a_%_%'	-- Finds any values that starts with "a" and are at least 3 characters in length
8SELECT * FROM table WHERE Column LIKE 'a%o'	-- Finds any values that starts with "a" and ends with "o"

CONTAINS() function

1-- SELECT columnName FROM yourTable WHERE CONTAINS (columnName, ‘yourSubstring’);
2SELECT * FROM table WHERE CONTAINS(column, 'test'); -- test
3SELECT * FROM table WHERE CONTAINS(column, 'test*'); -- test, testing, tested ..
4SELECT * FROM table WHERE CONTAINS(column, '*test'); -- test, greatest, latest ..
5SELECT * FROM table WHERE CONTAINS(column, '*test*'); -- test, greatest, latest, testing, tested ..
6
7-- search for multiple substrings (AND, OR)
8SELECT DocID, DocSummary FROM production.documents WHERE CONTAINS (DocSummary, ‘”replacing” OR “pedals”’);

Searching for multiple words/substrings

If you need all words to be present, use OR

Referencing data from multiple tables using JOINs

Sat, 25 Nov 2017 00:00:00 +0500

There are 3 types of JOINs

Inner Join
Outer Join
Left Outer Join
Right Outer Join
Cross Join

Connect to MySQL installed by MAMP via Command Line (Terminal)

Sun, 29 Oct 2017 00:00:00 +0500

tl;dr: You have to mention the socket file. The socket file is usually at

/Applications/MAMP/tmp/mysql/mysql.sock

Provide that socket file location in the command

1# Connect to MySQL
2mysql -uroot -proot --socket=/Applications/MAMP/tmp/mysql/mysql.sock

1# Backup all databases
2mysqldump -uroot -proot --socket=/Applications/MAMP/tmp/mysql/mysql.sock --all-databases > all_databases.sql

You can confirm the connection details on MAMP’s WebStart page: http://localhost:8080/MAMP/?language=English

Secure MySQL installation non-interactively with a bash script

Wed, 16 Aug 2017 00:00:00 +0500

There are two ways you can write the script. One is running the script with a here-document.

A here document (aka heredoc) is a special-purpose code block. It uses a form of I/O redirection to feed a command list to an interactive program or a command

Basically, you provide only the answers to the question the script is going to ask you, and then redirect them as input to the interactive program.

Update WordPress posts for SSL https

Mon, 14 Aug 2017 00:00:00 +0500

tl;dr

 1# UPDATE `wp_posts` SET `post_content` = REPLACE(post_content, '', '')
 2
 3# Update self-hosted embeds (images, iframes, scripts, etc.)
 4UPDATE `wp_posts` SET `post_content` = REPLACE(post_content, 'http://yoursite.com', 'https://yoursite.com');
 5UPDATE `wp_posts` SET `post_content` = REPLACE(post_content, 'http://www.yoursite.com', 'https://www.yoursite.com');
 6
 7# Update internal pingbacks
 8UPDATE `wp_comments` SET `comment_author_url` = REPLACE(comment_author_url, 'http://yoursite.com', 'https://yoursite.com');
 9UPDATE `wp_comments` SET `comment_author_url` = REPLACE(comment_author_url, 'http://www.yoursite.com', 'https://www.yoursite.com');
10
11# Update YouTube embeds
12UPDATE `wp_posts` SET `post_content` = REPLACE(post_content, 'http://www.youtube.com', 'https://www.youtube.com');
13UPDATE `wp_posts` SET `post_content` = REPLACE(post_content, 'http://img.youtube.com', 'https://img.youtube.com');
14
15# Update Vimeo embeds
16UPDATE `wp_posts` SET `post_content` = REPLACE(post_content, 'http://player.vimeo.com/', 'https://player.vimeo.com/');
17
18# Update Slideshare embeds
19UPDATE `wp_posts` SET `post_content` = REPLACE(post_content, 'http://www.slideshare.net', 'https://www.slideshare.net');

Why?

You have installed an SSL cert and force all URLs to https, yet the lock on your WordPress site’s URL has still not turned green
Your post’s media (uploads, images etc.) and embedded content (YouTube, Vimeo etc.) still links to http (insecure) endpoints (links).

How

The post content for your posts is in the post_content column of the wp_posts table
The simplest way to upload the links is to run a REPLACE function and change http with https
You can find out which links are insecure/blocked in your browser’s Developer Console (the Mixed Content: warnings..)

Find all posts linking to insecure URLs

1SELECT * FROM `wp_posts` where `post_content` LIKE "%http://%"

While you might be tempted to just update ALL links in posts to https in one go with the above command, this can cause issues. Not all sites (unfortunately) have shifted to https yet and if you update all posts links, you’ll get plenty of broken ones. Best approach is to update the links for known sites that you know for a fact use https (Sites like YouTube, Vimeo, Twitter as well your own site)

Common MySQL Errors

Thu, 06 Jul 2017 00:00:00 +0500

Error: Can’t connect to local MySQL server through socket ‘/var/run/mysqld/mysqld.sock’ (2)

tl;dr

1mkdir -p /var/run/mysqld
2touch /var/run/mysqld/mysqld.sock
3chmod 777 /var/run/mysqld/mysqld.sock
4chown mysql:mysql /var/run/mysqld
5service mysql restart

See if a socket file exists. To find all socket files on your system run:

1sudo find / -type s

Mysql server is usually open at /var/lib/mysql/mysql.sock

The MySQl configuration file is usually at /etc/mysql/my.cnf (Ubuntu 17.04)

stop MySQL

1sudo service mysqld stop

Look for a .pid file and delete it if found

Reset MySQL root password on Linux

Tue, 04 Jul 2017 00:00:00 +0500

tl;dr

 1sudo service mysql stop
 2
 3# get rid of can't connect errors
 4# by creating socket file
 5sudo mkdir -p /var/run/mysqld
 6sudo chown mysql:mysql /var/run/mysqld
 7sudo touch /var/run/mysqld/mysqld.sock
 8sudo chmod 777 /var/run/mysqld/mysqld.sock
 9
10# run mysql in safe mode
11sudo mysqld_safe --skip-grant-tables &
12
13# connect
14mysql -u root

1-- MySQL commands
2UPDATE mysql.user SET authentication_string=PASSWORD('1256fhsad12') WHERE user='root';
3UPDATE mysql.user SET plugin="mysql_native_password" WHERE user='root';
4FLUSH PRIVILEGES;
5exit;

1-- MySQL 8 commands
2ALTER USER 'root'@'localhost' IDENTIFIED BY 'new_password';
3-- UPDATE mysql.user SET plugin="mysql_native_password" WHERE user='root';
4FLUSH PRIVILEGES;
5exit;

stop mysql

OpenCart: Bulk Update Customer Group via phpmyadmin

Sun, 21 May 2017 00:00:03 +0500

Why?

Because you can not delete a group if it has customers in it. And there is no easy way to move all customers to another group via the admin.

Warning: This customer group cannot be deleted as it is currently assigned to 2170 customers!

Find the `customer_group_id` number of a Customer Group

You can find the customer_group_id from the Admin URL, or by checking the oc_customer_group_description table

Find all customers in a particular group

1SELECT * FROM `oc_customer` WHERE `customer_group_id`=1

Move all customers in one group to another group

1UPDATE `oc_customer` SET `customer_group_id`=3 WHERE `customer_group_id`=1

Getting started with Firebase Hosting

Sun, 26 Feb 2017 00:00:00 +0500

tl;dr

 1npm i -g firebase-tools
 2firebase login # will be redirected to Google Auth page
 3
 4cd /your-project-directory
 5
 6firebase init # initialize a project
 7# go through the initialization options
 8firebase deploy # deploy a site
 9# a public URL will be provided where you can see your websites
10firebase open # Hosting: Deployed Site
11firebase use --add # setup a staging environment (add a project alias)
12firebase use foo # use foo environment 
13firebase deploy # deploy changes to foo (whatever env you are in)

You can only create a project through the Firebase console. In order to manage projects with the CLI, you should create it at the web interface first.

OpenCart: Delete Multi-Store and Move Everything to the Default Store

Thu, 26 Feb 2015 00:00:00 +0500

Make a BACKUP before doing anything to the database. Be safe.

Assumptions

This post assumes that

the store_id for Default store is 0
you have only 1 multi-store
you are moving things from Multi-store to Default store
you want to delete Multi-Store
you have products that were added to both Default and Multi-store
everything means products, categories, manufacturers and information

We can’t delete a multi-store if there are orders associated with it. So the first step of the process would be to update all existing orders to associate with our main (default) store.

Backing up and Restoring Databases

Fri, 20 Feb 2015 00:00:02 +0500

Export

1HOST=""
2USER=""
3BACKUP_FILENAME="mysqlbackup"

export a single database

1# export a single database
2# mysqldump -u [username] -p [database] > FILENAME.sql
3mysqldump --host="host" --user="USERNAME" --password --port=3306 "db_name" > FILENAME.sql

export multiple databases

1# export multiple databases
2mysqldump -u USERNAME -p -–databases db1 db2 db3 | gzip > FILENAME.sql.gz

export all databases

1# export all databases
2# mysqldump -u [username] -p --all-databases > FILENAME.sql
3mysqldump -u USERNAME -p --all-databases > FILENAME.sql
4
5# compressed export
6# mysqldump -u [username] -p --all-databases > FILENAME.sql
7mysqldump -u USERNAME -p -–all-databases | gzip > FILENAME.sql.gz

Compressed database exports ( | gzip)

Tips for Querying a MySQL Database

Fri, 20 Feb 2015 00:00:01 +0500

Sort result ORDER based on frequency

Here is a nifty way of influencing the ORDER of rows returned by a query that helps in displaying a list with frequently accessed items at the top.

An example is a name/address form where the country is a selectable list. If most of your users are from the UK and US you may want to do something like:

1SELECT * FROM countries ORDER by iso_code IN ('UK', 'US') desc

Which returns something like:

OpenCart: Bulk update prices of Products

Fri, 13 Feb 2015 00:00:00 +0500

Changing the currency of an OpenCart store

update product price
update discount and special prices
update order totals

MySQL Commands

Multiply all prices in a column by 3.67000008

1UPDATE `oc_product` SET `price` = `price` * 3.670008

Round the numbers of an entire column

1UPDATE `oc_product` SET `price` = ROUND(`price`)

Select price column and create a new column ROUND(price) by rounding the value of price

1SELECT `price`, ROUND(`price`) from `oc_product`

Why?

I have an opencart that is setup with multiple currencies. When it started, the currency was USD and all the prices were entered in USD but later on we wanted to show AED so another currency was set up and a conversion rate was used to convert USD prices and show them in AED to the users. The side effect of this was having to enter the product prices in USD (after taking a calculator and converting price) while the business worked in AED.

How to add a WordPress Admin user via PhpMyAdmin

Thu, 12 Feb 2015 00:00:00 +0500

Why?

Add support user for all hosting accounts that have wordpress installed, with one command via phpmyadmin and whm access.

1INSERT INTO `databasename`.`wp_users` (`ID`, `user_login`, `user_pass`, `user_nicename`, `user_email`, `user_url`, `user_registered`, `user_activation_key`, `user_status`, `display_name`) VALUES ('9191919', 'username', MD5('password'), 'Name', 'test@yourdomain.com', 'http://hostmarkaz.com/', '2015-02-11 00:00:00', '', '0', 'Your Name');
2
3INSERT INTO `databasename`.`wp_usermeta` (`umeta_id`, `user_id`, `meta_key`, `meta_value`) VALUES (NULL, '9191919', 'wp_capabilities', 'a:1:{s:13:"administrator";s:1:"1";}');
4
5INSERT INTO `databasename`.`wp_usermeta` (`umeta_id`, `user_id`, `meta_key`, `meta_value`) VALUES (NULL, '9191919', 'wp_user_level', '10');

Fields to change

Database = databasename
ID = 9191919
user_login = username
user_pass = password
user_nicename = Name
user_email = test@yourdomain.com
user_url = http://hostmarkaz.com
user_activation_key =
user_status = 0
display_name = Your Name

Notes:

Keep the ID number really high to avoid conflicts and errors. Some sites really have a lot of users because of affiliate or membership plugins.

Source

Automated MySQL Backups to Amazon S3 with AutoMySQLBackups

Tue, 19 Aug 2014 12:59:41 +0500

Access (Logins) required

root login for the server (sudo is required to run automysqlbackup, root is req. to add to root user’s cron)
admin login for the mysql server (to provide for backup config file)
IAM access keys to use with s3cmd (to configure s3cmd)

sudo is required to run the AutoMySQLBackup script, so when adding the command to cron, you’d need to add it to the root user’s cron (so that it runs successfully on set intervals without asking for a password).

Databases on Aamnah - Frontend Web Developer

Getting started with PostgreSQL on Ubuntu

PostgreSQL commands

Sample commands

Enable logs (general, error, slow query) for Amazon RDS databases (MySQL, MariaDB)

MySQL Parameters

Finding slow MySQL queries

Notes on Moving from MySQL to MariaDB and Replication

Replication

Galera Cluster

Keywords

Further reading

ClusterControl Setup

Links

Notes on Moving Large Databases

NOTES

Exporting

Get only stored procedures and table structure, but no data

Find out MySQL Database sizes

Links

Allowing remote access to MySQL

Links

Importing ALL Gzipped databases

Search for characters in SQL with LIKE and CONTAIN

LIKE operator

CONTAINS() function

Searching for multiple words/substrings

Referencing data from multiple tables using JOINs

Links

Connect to MySQL installed by MAMP via Command Line (Terminal)

Secure MySQL installation non-interactively with a bash script

Update WordPress posts for SSL https

tl;dr

Why?

How

Find all posts linking to insecure URLs

Common MySQL Errors

Error: Can’t connect to local MySQL server through socket ‘/var/run/mysqld/mysqld.sock’ (2)

Reset MySQL root password on Linux

tl;dr

OpenCart: Bulk Update Customer Group via phpmyadmin

Why?

Find the customer_group_id number of a Customer Group

Find all customers in a particular group

Move all customers in one group to another group

Getting started with Firebase Hosting

tl;dr

OpenCart: Delete Multi-Store and Move Everything to the Default Store

Assumptions

Backing up and Restoring Databases

Export

Tips for Querying a MySQL Database

Sort result ORDER based on frequency

OpenCart: Bulk update prices of Products

MySQL Commands

Why?

How to add a WordPress Admin user via PhpMyAdmin

Why?

Fields to change

Notes:

Automated MySQL Backups to Amazon S3 with AutoMySQLBackups

Access (Logins) required

Find the `customer_group_id` number of a Customer Group