合并连接的特点是:需要Join的记录必须分布到单节点上去才能进行;对每张表只读取一次;比乘积连接(Product Join)的效率要高;在没有更好的优化方式时,它是一种比较通用的方法。
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"When a farmer elects to join the insurance, we sell the product on wholesale so that the premium is reduced, so that he doesn'tt feel it, so that it cushions him and I've also sold the product."
VOA: special.2010.05.11
And I actually think it's probably important for anybody who wants to do a startup, anybody who wants to join a place like Microsoft and work on an established or a new product.
实际上我想这对任何想创业的人,来说应该都很重要,任何想加入微软这样的公司,为新老产品工作的人都是这样。
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