Question: What does this query mean? CREATE ASSERTION myAssert CHECK (NOT EXISTS SELECT Product.name FROM Product, Purchase WHERE Product.name = Purchase.prod Name GROUP BY Product.name HAVING

What does this query mean? CREATE ASSERTION myAssert CHECK (NOT EXISTS

What does this query mean?

CREATE ASSERTION myAssert CHECK (NOT EXISTS SELECT Product.name FROM Product, Purchase WHERE Product.name = Purchase.prod Name GROUP BY Product.name HAVING count(*) > 200) )

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