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53 lines
1.2 KiB
HTML
53 lines
1.2 KiB
HTML
<p>表: <code>Courses</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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| student | varchar |
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| class | varchar |
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+-------------+---------+
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在 SQL 中,(student, class)是该表的主键列。
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该表的每一行表示学生的名字和他们注册的班级。
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</pre>
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<p> </p>
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<p>查询 <strong>至少有5个学生</strong> 的所有班级。</p>
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<p>以 <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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Courses table:
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+---------+----------+
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| student | class |
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+---------+----------+
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| A | Math |
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| B | English |
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| C | Math |
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| D | Biology |
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| E | Math |
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| F | Computer |
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| G | Math |
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| H | Math |
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| I | Math |
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+---------+----------+
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<strong>输出:</strong>
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+---------+
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| class |
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+---------+
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| Math |
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+---------+
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<strong>解释: </strong>
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-数学课有6个学生,所以我们包括它。
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-英语课有1名学生,所以我们不包括它。
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-生物课有1名学生,所以我们不包括它。
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-计算机课有1个学生,所以我们不包括它。</pre>
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