SQL Tutorial (2021) -- Constraints, COUNT, DISTINCT (vid# 6 of series)

SQL Tutorial -- Constraints, COUNT, DISTINCT
(( NOTE )) After watching the whole video, easily revisit a topic...CLICK on the topic's time link below.
00:00 - Overview of topics
02:45 - DISTINCT
05:07 - DISTINCT & ORDER BY
10:32 - COUNT
22:45 - COUNT & DISTINCT
26:18 - COUNT & GROUP BY
29:42 - COUNT, GROUP BY & ORDER BY
32:54 - COUNT, GROUP BY & ORDER BY...DESC
37:00 - CONSTRAINTS

SQL is the language used to communicate with a database. This video is part of an SQL tutorial series. Here below is the link to the 1st video of that series:
https://www.youtube.com/watch?v=7zkGZj1Pylo&t=2s?sub_confirmation=1
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