Intro to Relational Data Bases summary.

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Ahmed Ayman edited this page Jun 30, 2017 · 1 revision

here's the course

Lesson 1 Notes:

take care of the difference between the meaning and the data types.
we always do Aggregation. SELECT ALL THAT HAS SOME PROPERTY... it needs data separated into rows not joined together.
select 4+4 as sum, 2-2 as sub.