add leetcode problem-cn part6

算法题（国内版）/problem (Chinese)/超过经理收入的员工 [employees-earning-more-than-their-managers].html

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+<p>表：<code>Employee</code>&nbsp;</p>
+
+<pre>
++-------------+---------+
+| Column Name | Type    |
++-------------+---------+
+| id          | int     |
+| name        | varchar |
+| salary      | int     |
+| managerId   | int     |
++-------------+---------+
+Id是该表的主键。
+该表的每一行都表示雇员的ID、姓名、工资和经理的ID。
+</pre>
+
+<p>&nbsp;</p>
+
+<p>编写一个SQL查询来查找收入比经理高的员工。</p>
+
+<p>以 <strong>任意顺序</strong> 返回结果表。</p>
+
+<p>查询结果格式如下所示。</p>
+
+<p>&nbsp;</p>
+
+<p><strong>示例 1:</strong></p>
+
+<pre>
+<strong>输入:</strong> 
+Employee 表:
++----+-------+--------+-----------+
+| id | name  | salary | managerId |
++----+-------+--------+-----------+
+| 1  | Joe   | 70000  | 3         |
+| 2  | Henry | 80000  | 4         |
+| 3  | Sam   | 60000  | Null      |
+| 4  | Max   | 90000  | Null      |
++----+-------+--------+-----------+
+<strong>输出:</strong> 
++----------+
+| Employee |
++----------+
+| Joe      |
++----------+
+<strong>解释:</strong> Joe 是唯一挣得比经理多的雇员。</pre>