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第4章:聚合函数

于 2020-06-24 发布
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说明:  整理了SQL基础部分的知识点,涵盖了系统函数,聚合函数再加上小例子(SQL SERVER study,You can study this by SQL document)

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第4章:聚合函数.sql, 4718 , 2019-07-17

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    分隙ALOHA: 该协议下,用户在产生帧后总是等到下一帧时开始时才发送,所以,对于结构FrameTime_struct,其m_Frame[i](相对时间)总是为零。发生冲突后同样等待一个随机时间重发。 所以只要满足当前帧时只有一帧发送,就可以发送成功,而不需考虑上一帧时的情况。 -points gap ALOHA : under the agreement, users always have a frame after frame until the next time when this started, so that the structure FrameTime_struct, m_Frame [i] (relative to time) always zero. After the conflict the same time waiting for a random re-issued. Therefore, as long as the current frame to meet only one this, we can successfully sent, and not considering one at the situation.
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