Add update and delete Database function

[devbyray]

It's not about a feature for the website, but I would love to see more examples of database functions.

I'm not a database expert at all, so I think it would be awesome if the following database function examples were added.

• Update database row based on a trigger from a user. (for example, update the email from an existing user In the "profiles" table)
• Delete database row based on a trigger from a user. (for example, delete a user's profile in the "profiles" table based on the user id.