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In this guide, I'll quickly show you how to migrate a WordPress-Database.
Head into your PhpMyAdmin and go to the Database-Tab.
Go into your WordPress-Database.
Now, press on the Export-Tab.
Press OK in the bottom right corner and save the Database-file.
In the Database-Tab, press on the Import-Tab.
Select the Database-file you've exported before.
Again, press OK in the bottom right corner.
Open your WordPress installation-folder.
Edit the wp-config.php file with any kind of text or script editor.
You want to update these values with your new database information:
Save and you're good to go.
Your Database might still have some old refrences to your previous domain, which can cause errors.
WordPress suggests the following solutions: