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Primary keys - the basics
5. Primary keys - duplicated values
Single-column primary keys
Multicolumn primary keys
Auto-increment columns and sequences


Perfect. And what will happen if we try to enter a row with the same id as an existing row in the table? Let's try that.


Try to add a new movie with an id between 1 and 10 and see what happens. When you're done, press the button to continue.