Intro to Relational Data Bases summary. - Ahmed-Ayman/My-2017-Vacation GitHub Wiki

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.