mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
synced 2025-11-04 19:53:12 +08:00
53 lines
1.3 KiB
HTML
53 lines
1.3 KiB
HTML
<p>Table: <code>Courses</code></p>
|
|
|
|
<pre>
|
|
+-------------+---------+
|
|
| Column Name | Type |
|
|
+-------------+---------+
|
|
| student | varchar |
|
|
| class | varchar |
|
|
+-------------+---------+
|
|
(student, class) is the primary key (combination of columns with unique values) for this table.
|
|
Each row of this table indicates the name of a student and the class in which they are enrolled.
|
|
</pre>
|
|
|
|
<p> </p>
|
|
|
|
<p>Write a solution to find all the classes that have <strong>at least five students</strong>.</p>
|
|
|
|
<p>Return the result table in <strong>any order</strong>.</p>
|
|
|
|
<p>The result format is in the following example.</p>
|
|
|
|
<p> </p>
|
|
<p><strong class="example">Example 1:</strong></p>
|
|
|
|
<pre>
|
|
<strong>Input:</strong>
|
|
Courses table:
|
|
+---------+----------+
|
|
| student | class |
|
|
+---------+----------+
|
|
| A | Math |
|
|
| B | English |
|
|
| C | Math |
|
|
| D | Biology |
|
|
| E | Math |
|
|
| F | Computer |
|
|
| G | Math |
|
|
| H | Math |
|
|
| I | Math |
|
|
+---------+----------+
|
|
<strong>Output:</strong>
|
|
+---------+
|
|
| class |
|
|
+---------+
|
|
| Math |
|
|
+---------+
|
|
<strong>Explanation:</strong>
|
|
- Math has 6 students, so we include it.
|
|
- English has 1 student, so we do not include it.
|
|
- Biology has 1 student, so we do not include it.
|
|
- Computer has 1 student, so we do not include it.
|
|
</pre>
|