Domain change via sql queries in phpmyadmin
**!!! It is recommended to create a backup copy of the database before proceeding
Go into phpmyadmin → on the left side click on your database → SQL tab and make 3 sql queries
UPDATE wp_options SET option_value = REPLACE(option_value, 'http://old_domain.com', 'http://new_domain.com') WHERE
option_name = 'home' OR option_name = 'siteurl';
UPDATE wp_posts SET guid = REPLACE(guid, 'http://old_domain.com', 'http://new_domain.com');
UPDATE wp_posts SET post_content = REPLACE(post_content, 'http://old_domain.com', 'http://new_domain.com');
where old_domain.com is the old domain and new_domain.com is the new domain
Changing the domain via normal phpmyadmin and text editor
Do export of WP database via phpmyadmin to local computer
Open DB in Notepadqq or Notepad2 text editor, shortcut Ctrl+H to bring up search window and replace all links from old address with new one
Import the database back via phpmyadmin into the newly created database and plug that database into wp-config.php
Check it works.