SQL List the item ID, description, and category for each pair of items that are in the same category. (For example, one such pair would be item FS42 and item PF19, because the category for both items is FSH.) Order the output by category. I have this hint, but I cannot figure out what to write within the HAVING clause: SELECT CATEGORY, ITEM_ID, DESCRIPTION   FROM ITEM  WHERE EXISTS (SELECT COUNT(*) FROM ITEM I                        WHERE I._____________ = ITEM._______________                        GROUP BY CATEGORY                       HAVING ___________________) ORDER BY ________________;

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