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10. Exercise 6


Good job! Now let's go on to the following exercise in joining tables.


Each recipe contains a different number of ingredients. Find the number of ingredients in each recipe. Select only those recipes which have fewer than 5 ingredients. Display the recipe name and its number of ingredients (name the column number_of_ingredients).

Stuck? Here's a hint!

To count ingredients, use the COUNT aggregate function. To filter aggregate values, you need the HAVING clause. To review the HAVING clause, look at Basics of PostgreSQL Part 4: Aggregation and grouping.