why databases need indexes

追加: 2026-05-06

[00:00:00]Databases need indexes. Imagine looking for a name in a phone book with no order. You'd flip every page. [music] That's slow. An index is like the tabs at the side. It tells you exactly where to go.

[00:00:12]>> [music] >> No flipping. Just instant. That's the difference.

[00:00:17]>> [music]