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酒店案例
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?
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?
***如不小心进入后室(backroom)该如何求生?
***如不小心进入后室(backroom)该如何求生?
count(*) count(1)哪个更快?
count(*) count(1)哪个更快?
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