Instruction
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The SQL statements (CREATE TABLE) are, of course, used by developers when they work with databases. However, it's hard to understand such code when you work with a lot of complicated tables. Sometimes you just want to have a general idea of our tables without studying the tables in detail. We may then use the so-called Entity Relationship Diagrams (commonly abbreviated to ERD). They look like this:

As you can see, they are much easier to understand at first glance than SQL statements.
Exercise
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