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So don't worry so much about how to use  had had  as a unit of grammar, they will come together naturally when you want to express the verb ' to have ' in the past perfect. Let's consider a different verb for a moment like  to want .
You also agree that your personal information may be transferred and processed in the United States, and that you have read and agree to the Terms of Use and the Privacy Policy. The difference is that WHERE operates on individual rows, while HAVING operates on groups. You can have WHERE without HAVING, you can have HAVING without WHERE, you can have both WHERE and HAVING, and you can have neither WHERE nor HAVING. But you can't have HAVING without grouping, even if the group consists of the entire result set. A good example of the difference between WHERE and HAVING is given in my earlier answer Why WHERE cannot be used after GROUP BY. This query returns the cust_id and number of orders for every customer who has order totals of $10,000 or more (the HAVING condition) for orders made this year (the WHERE condition).