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A composite B-tree is still a sorted tree, but now entries are ordered first by severity, and then by timestamp within each severity value. This works great for this query shape: Postgres can jump directly to the portion of the tree matching severity
。91吃瓜对此有专业解读
Марина Совина (ночной редактор)。手游是该领域的重要参考
notations like this one from Wikipedia:
Apple представила дешевый iPhoneiPhone 17e получил чип A19, экран с «монобровью», одну камеру и MagSafe