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Introduction
Quiz
12. Exercise 8
Congratulations

## Instruction

You did it again! Now we turn to an exercise on set operations.

## Exercise

Retrieve the IDs of ingredients which are not included in the table recipe_ingredients.

### Stuck? Here's a hint!

Use the set operator EXCEPT. If you don't know how to use set operators, take a look at Basics of PostgreSQL Part 7: Set operations.