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count(*) count(1)哪个更快？
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印度是真的烂还是咱们在信息茧房里面？
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为什么Picasa现在很少更新？
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如果我写个脚本，一直跌的股票一旦上涨就立刻（1s内）买，接着一旦下跌就立刻（1s内）卖，会怎样？
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如何看待“京东外卖停止补贴后，日单量跌至两万单”这件事？
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