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Database XI

SELECT * from the_world; Why & how SQL rocks

Please remember this till the end of your professional life

Important

  • string literals are enclosed in single quotes
  • quoted identifiers are enclosed in double quotes
  • boolean equals operator is =, not ==
  • there is no such thing as natural order. Order of records is random unless set explicitly
  • SQL queries run in the order shown below. The syntax order is very different

About complexity

image

About ORM

Ted Neward's ORM - The Vietnam of Computer Science

About foreign data - Postgres OnLine Journal Windows binaries of FDW & extensions here and here

Sample data

ECB Foreign Exchange Rates history
My State machines' farm implementation

Tip

Since 2025-10-01 JetBrains DataGrip database management IDE is free for non-commercial use!
You may give it a try. It scores a bit higher than DBeaver.

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