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mysql from后接子查询,实际为将结果集合并成一张表
#案例:查询每个部门的平均工资的工资等级SELECTav.*,g.`grade_level`FROM(SELECTAVG(salary)ag,department_idFROMemployeesGROUPBYdepartment_id)avINNERJOINjob_gradesgONav.agBETWEENg.`lowest_sal`ANDg.`highest_sal`;
分类:数据库   时间:2019-09-16 21:57:25    阅读次数:175
mysql sql99语法 内连接非等值连接
#案例:查询员工的工资级别SELECTsalary,grade_levelFROMemployeeseJOINjob_gradesgONe.`salary`BETWEENg.`lowest_sal`ANDg.`lowest_sal`;#案例:查询每个工资级别的个数,并且按级别降序SELECTCOUNT(*),grade_levelFROMjob_gradesjJOINemployeeseONe.`
分类:数据库   时间:2019-09-14 01:10:42    阅读次数:108
最近公共祖先 Lowest Common Ancestors
在介绍官方解法之前,我先讲述一下我的方法: 这个方法的优点在于:没什么太多的限制,效率也还OK。 如果二叉树根据顺序存储,(一般下标对应编号),那么一下算法可以解决: ...
分类:其他好文   时间:2019-09-11 14:06:14    阅读次数:90
mysql 非等值连接
#案例:查询员工的工资和工资级别SELECTsalary,grade_levelFROMemployeesASe,job_gradesASjWHEREsalaryBETWEENj.`lowest_sal`ANDj.`highest_sal`#e表的salary字段会和j表的每行字段挨个比较
分类:数据库   时间:2019-09-11 11:46:35    阅读次数:204
PAT 1036 Boys vs Girls (25 分)
1036 Boys vs Girls (25 分) 1036 Boys vs Girls (25 分) 1036 Boys vs Girls (25 分) This time you are asked to tell the difference between the lowest grade ...
分类:其他好文   时间:2019-09-03 22:17:02    阅读次数:91
LeetCode 712. Minimum ASCII Delete Sum for Two Strings
原题链接在这里:https://leetcode.com/problems/minimum-ascii-delete-sum-for-two-strings/ 题目: Given two strings s1, s2, find the lowest ASCII sum of deleted cha ...
分类:其他好文   时间:2019-09-03 10:06:40    阅读次数:135
235. Lowest Common Ancestor of a Binary Search Tree
Given a binary search tree (BST), find the lowest common ancestor (LCA) of two given nodes in the BST. According to the definition of LCA on Wikipedia ...
分类:其他好文   时间:2019-09-02 09:33:29    阅读次数:78
PAT甲级——A1106 Lowest Price in Supply Chain
A supply chain is a network of retailers(零售商), distributors(经销商), and suppliers(供应商)-- everyone involved in moving a product from supplier to customer ...
分类:其他好文   时间:2019-09-01 12:22:12    阅读次数:125
PAT 甲级 1036 Boys vs Girls (25 分)(简单题)
1036 Boys vs Girls (25 分) 1036 Boys vs Girls (25 分) 1036 Boys vs Girls (25 分) This time you are asked to tell the difference between the lowest grade ...
分类:其他好文   时间:2019-08-27 21:28:50    阅读次数:120
[LeetCode] 1123. Lowest Common Ancestor of Deepest Leaves 最深叶结点的最小公共父节点
Given a rooted binary tree, return the lowest common ancestor of its deepest leaves. Recall that: The node of a binary tree is a leaf if and only if i ...
分类:其他好文   时间:2019-08-23 00:01:48    阅读次数:99
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