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Databases Querying Relational Databases Subqueries Subqueries

Task 4 of 4 is driving me mad. Obviously I do not get it

Why is the Task 4 so unnecessarily difficult? I tried a hundred times but no query worked. The messages I get are not helping me. What is annoying is that there is no hint towards the solution if you have difficulty. Some websites let you see the solution of others if you submit a solution even if what you submit is not the solution. So that you can learn and pass the course. Now I am stuck at the end of the course until I stumble upon the correct solution. I cannot finish the chapter until my luck or someone from the community helps me. I am waiting until one of them turns my way.