DNS records for a subdomain
If you send mail from a subdomain, you may not be able to add a TXT record for that subdomain. To use DKIM authentication, you can add the necessary TXT record to the parent domain.
MySQL Sandbox with the Sakila sample database
You can go to https://www.katacoda.com/mysql-db-sandbox/scenarios/mysql-sandbox to access the MySQL Sandbox, which has the Sakila sample database loaded in a MySQL instance. You’ll have to set up a (free) Katacoda account. Then, click the Start Scenario button. See also: https://dev.mysql.com/doc/index-other.html
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