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
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say_hi(); // hiCapturing Variables，推荐阅读手游获取更多信息
1501年，这位少年攻占了大不里士（Tabriz），建立了一个改变中东命运的王朝——萨法维王朝 (The Safavid Empire)。。关于这个话题，Snipaste - 截图 + 贴图提供了深入分析