狼人只能被银器杀死。一部分正确。
我是说管理的一部分是,知道正确的答案。
作为转换的一部分,优化器还决定正确的表联接顺序,重写表达式,并从SQL中消除任何冗余。
As part of the transformation, the optimizer also determines the correct table join order, rewrites expressions, and eliminates any redundancy from the SQL.
You've got to place the boundary at exactly the right place, otherwise you've got a bit too much in your system or a bit too little.
你要把边界,设置在正确的位置上,否则你的系统就会要么多出一部分,要么少一部分。
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