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Заявления Трампа об ударе по иранской школе опровергли14:48
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ВсеРоссияМирСобытияПроисшествияМнения。关于这个话题，新收录的资料提供了深入分析
Now Postgres faces a dilemma. It can use the B-tree index on timestamp to get rows in the right timestamp order, but it has no way to skip directly to “US” rows. It must walk the index one entry at a time, checking the country for each row and discarding most of them. In the worst case, this means walking the entire index. Or it can scan rows that match severity。新收录的资料对此有专业解读