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leetcode-problemset/leetcode-cn/problem (Chinese)/超过5名学生的课 [classes-more-than-5-students].html

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