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59 lines
1.7 KiB
HTML
59 lines
1.7 KiB
HTML
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<p>表: <code>Accounts</code></p>
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<pre>
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+-------------+------+
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| 列名 | 类型 |
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+-------------+------+
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| account_id | int |
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| income | int |
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+-------------+------+
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在 SQL 中，account_id 是这个表的主键。
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每一行都包含一个银行帐户的月收入的信息。
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</pre>
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<p> </p>
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<p>查询每个工资类别的银行账户数量。 工资类别如下：</p>
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<ul>
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<li><code>"Low Salary"</code>：所有工资 <strong>严格低于</strong> <code>20000</code> 美元。</li>
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<li><code>"Average Salary"</code>： <strong>包含</strong> 范围内的所有工资 <code>[$20000, $50000]</code> 。</li>
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<li>
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<p><code>"High Salary"</code>：所有工资 <strong>严格大于</strong> <code>50000</code> 美元。</p>
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</li>
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</ul>
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<p>结果表 <strong>必须</strong> 包含所有三个类别。 如果某个类别中没有帐户，则报告 <code>0</code> 。</p>
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<p>按 <strong>任意顺序</strong> 返回结果表。</p>
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<p>查询结果格式如下示例。</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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<b>输入：</b>
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Accounts 表:
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+------------+--------+
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| account_id | income |
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+------------+--------+
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| 3 | 108939 |
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| 2 | 12747 |
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| 8 | 87709 |
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| 6 | 91796 |
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+------------+--------+
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<strong>输出：</strong>
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+----------------+----------------+
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| category | accounts_count |
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+----------------+----------------+
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| Low Salary | 1 |
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| Average Salary | 0 |
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| High Salary | 3 |
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+----------------+----------------+
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<strong>解释：</strong>
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低薪: 有一个账户 2.
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中等薪水: 没有.
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高薪: 有三个账户，他们是 3, 6和 8.</pre>
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