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73 lines
1.8 KiB
HTML
73 lines
1.8 KiB
HTML
<p>表: <code>Employees</code></p>
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<pre>
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+-------------+---------+
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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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+-------------+---------+
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employee_id 是这个表的主键。
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每一行表示雇员的id 和他的姓名。
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</pre>
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<p>表: <code>Salaries</code></p>
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<pre>
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+-------------+---------+
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| Column Name | Type |
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+-------------+---------+
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| employee_id | int |
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| salary | int |
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+-------------+---------+
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employee_id is 这个表的主键。
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每一行表示雇员的id 和他的薪水。
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</pre>
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<p> </p>
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<p>写出一个查询语句，找到所有 <strong>丢失信息</strong> 的雇员id。当满足下面一个条件时，就被认为是雇员的信息丢失：</p>
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<ul>
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<li>雇员的 <strong>姓名</strong> 丢失了，或者</li>
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<li>雇员的 <strong>薪水信息</strong> 丢失了，或者</li>
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</ul>
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<p>返回这些雇员的id <code>employee_id</code> ， <strong>从小到大排序 </strong>。</p>
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<p>查询结果格式如下面的例子所示。</p>
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<p> </p>
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<p><strong>示例 1：</strong></p>
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<pre>
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<strong>输入：</strong>
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Employees table:
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+-------------+----------+
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| employee_id | name |
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+-------------+----------+
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| 2 | Crew |
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| 4 | Haven |
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| 5 | Kristian |
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+-------------+----------+
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Salaries table:
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+-------------+--------+
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| employee_id | salary |
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+-------------+--------+
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| 5 | 76071 |
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| 1 | 22517 |
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| 4 | 63539 |
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+-------------+--------+
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<strong>输出：</strong>
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+-------------+
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| employee_id |
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+-------------+
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| 1 |
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| 2 |
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+-------------+
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<strong>解释：</strong>
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雇员1，2，4，5 都工作在这个公司。
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1号雇员的姓名丢失了。
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2号雇员的薪水信息丢失了。</pre>
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