How do the relations (tables) in SQL differ from the relations defined in earlier modules (tuples, etc.)?

When keyboarding, if you want to be fast and accurate you should return your hands on home row with your fingers relaxed and your eyes on the text use only your index fingers to hunt and peck keep your fingers stiff and your eyes on the keys slouch in your chair and keep your fingers hovering over all of the keys

What are procedures that keep a data base current

What engine component is shown in the above figure?