Drush: difference between pm-update pm-updatecode

Question

What's the difference between pm-update and pm-updatecode? I reviewed this in the Drush documentation, but they sound the same.

Answer 1

pm-update also runs the update.php script to take care of any database schema changes that a module may need (same as drush updatedb), pm-updatecode doesn't. Under many/most circumstances, you can just run pm-update.