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45 lines
1.7 KiB
HTML
45 lines
1.7 KiB
HTML
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<p>Table: <code>Employees</code></p>
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<pre>+-------------+----------+
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| Column Name | Type |
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+-------------+----------+
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| employee_id | int |
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| name | varchar |
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| reports_to | int |
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| age | int |
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+-------------+----------+
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employee_id 是这个表的主键.
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该表包含员工以及需要听取他们汇报的上级经理的ID的信息。 有些员工不需要向任何人汇报（reports_to 为空）。
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</pre>
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<p> </p>
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<p>对于此问题，我们将至少有一个其他员工需要向他汇报的员工，视为一个经理。</p>
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<p>编写SQL查询需要听取汇报的所有经理的ID、名称、直接向该经理汇报的员工人数，以及这些员工的平均年龄，其中该平均年龄需要四舍五入到最接近的整数。</p>
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<p>返回的结果集需要按照 <code>employee_id </code>进行排序。</p>
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<p>查询结果的格式如下：</p>
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<p> </p>
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<pre>Employees table:
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+-------------+---------+------------+-----+
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| employee_id | name | reports_to | age |
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+-------------+---------+------------+-----+
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| 9 | Hercy | null | 43 |
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| 6 | Alice | 9 | 41 |
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| 4 | Bob | 9 | 36 |
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| 2 | Winston | null | 37 |
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+-------------+---------+------------+-----+
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Result table:
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+-------------+-------+---------------+-------------+
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| employee_id | name | reports_count | average_age |
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+-------------+-------+---------------+-------------+
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| 9 | Hercy | 2 | 39 |
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+-------------+-------+---------------+-------------+
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Hercy 有两个需要向他汇报的员工, 他们是 Alice and Bob. 他们的平均年龄是 (41+36)/2 = 38.5, 四舍五入的结果是 39.
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</pre>
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