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mysql比较运算,逻辑运算,范围查询,模糊查询
比较运算 > < = != <> <= >= 逻辑运算 and or not 范围查询 in 模糊查询 like select distinct age from classes; 将classes表格里age去重 select * from classes where id <= 3; 打印cla ...
分类:数据库   时间:2018-12-05 20:49:16    阅读次数:215
LeetCode 447. Number of Boomerangs
Given n points in the plane that are all pairwise distinct, a “boomerang” is a tuple of points (i, j, k) such that the distance between iand j equals ...
分类:其他好文   时间:2018-12-04 22:40:17    阅读次数:421
LeetCoce 413. Arithmetic Slices
A sequence of number is called arithmetic if it consists of at least three elements and if the difference between any two consecutive elements is the ...
分类:其他好文   时间:2018-12-04 22:39:12    阅读次数:196
938. Range Sum of BST
Given the root node of a binary search tree, return the sum of values of all nodes with value between L and R (inclusive). The binary search tree is g ...
分类:其他好文   时间:2018-12-04 14:50:27    阅读次数:226
mysql统计某段日期中某段时间的数据
中间的动态拼接是为了防止隔天查询(如17:30-8:30),当然就收数据后要进行处理让后在传入 SELECT count(DISTINCT barcode) AS count,DATE_FORMAT(date, '%Y-%m-%d') AS ti FROM ag_cpparts WHERE DATE ...
分类:数据库   时间:2018-12-04 14:49:28    阅读次数:287
783. Minimum Distance Between BST Nodes
Given a Binary Search Tree (BST) with the root node root, return the minimum difference between the values of any two different nodes in the tree. Exa ...
分类:其他好文   时间:2018-12-04 13:23:24    阅读次数:199
opencv直线拟合cv::fitLine()
通过2D或者2D点集拟合直线 void fitLine( InputArray points, OutputArray line, int distType,double param, double reps, double aeps ); @param points Input vector of ...
分类:其他好文   时间:2018-12-04 11:24:24    阅读次数:1180
LeetCode 376. Wiggle Subsequence
A sequence of numbers is called a wiggle sequence if the differences between successive numbers strictly alternate between positive and negative. The ...
分类:其他好文   时间:2018-12-03 22:57:23    阅读次数:314
Oracle书写格式
修改日期格式 alter session set NLS_DATE_FORMAT = 'YYYY-MM-DD'; BETWEEN ...AND between 1000 and 2000; --可以查询到结果 between 2000 and 1000; --无法查询到结果 ...
分类:数据库   时间:2018-12-03 21:41:36    阅读次数:183
MOCTF 简单注入,记录一下盲注脚本
最近在练习sql注入写脚本,记录一下思路,刚学的and 1=1也拿出来溜溜 http://119.23.73.3:5004/?id=1 首先,没有被过滤是正常显示。 没有被过滤但是查询不到就是空白,比如?id=99999 waf过滤关键词,提示whatfuck ① 我首先判断的是有没有用trim() ...
分类:其他好文   时间:2018-12-02 15:22:39    阅读次数:470
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