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Home Page: https://jameingh.github.io/
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Home Page: https://jameingh.github.io/
https://jameingh.github.io/2021/02/08/%E6%88%91%E5%BA%94%E8%AF%A5%E5%86%99%E4%BB%80%E4%B9%88/
机会是给有准备的人的,加油,时刻保持对技术点对复习和思考
https://jameingh.github.io/2021/03/11/%E6%9C%80%E5%B7%A6%E5%89%8D%E7%BC%80/
记录和分享,如果给 user 表中的 username pwd 字段创建了复合索引那么使用以下SQL 都是可以命中索引:
select username from user where username=,
https://jameingh.github.io/2021/03/11/%E6%9C%80%E5%B7%A6%E5%89%8D%E7%BC%80/
介绍了联合索引、优化器相关机制,如何读懂explain分析的sql执行计划,搞懂联合索引的行为,搞懂最左前缀原则
https://jameingh.github.io/2021/02/12/selection-sort/
记录和分享,排序过程假如对如下数组排序
我们打算从小到大排序
第一轮先找到数组中最小的,是1
然后将1和数组中第一个位置上的数交换,这样,1就是最终的位置了
第二轮那么1排好了,我们从剩下的数里面找最小的,
https://jameingh.github.io/2021/03/16/%E6%8F%92%E5%85%A5%E6%8E%92%E5%BA%8F/
记录和分享,插入排序将如要对下面的数组排序
第一个元素8,不动,对于8,他是排好序的,继续下一个元素
我们想要把第二个元素6,插入到前面元素的合适位置,
6比8小,交换位置
下面开始,将2插入到前面合适,
https://jameingh.github.io/2021/03/16/%E6%8F%92%E5%85%A5%E6%8E%92%E5%BA%8F/
每次将当前的元素复制一份拷贝,然后和前面的元素比较,前面的元素比当前元素大,向后移动一位,找到合适的位置后,然后插入
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