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https://gitee.com/coder-xiaomo/leetcode-problemset
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96 lines
8.6 KiB
JSON
96 lines
8.6 KiB
JSON
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"questionId": "596",
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"categoryTitle": "Database",
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"boundTopicId": 1418,
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"title": "Classes More Than 5 Students",
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"titleSlug": "classes-more-than-5-students",
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"content": "<p>Table: <code>Courses</code></p>\n\n<pre>\n+-------------+---------+\n| Column Name | Type |\n+-------------+---------+\n| student | varchar |\n| class | varchar |\n+-------------+---------+\n(student, class) is the primary key (combination of columns with unique values) for this table.\nEach row of this table indicates the name of a student and the class in which they are enrolled.\n</pre>\n\n<p> </p>\n\n<p>Write a solution to find all the classes that have <strong>at least five students</strong>.</p>\n\n<p>Return the result table in <strong>any order</strong>.</p>\n\n<p>The result format is in the following example.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> \nCourses table:\n+---------+----------+\n| student | class |\n+---------+----------+\n| A | Math |\n| B | English |\n| C | Math |\n| D | Biology |\n| E | Math |\n| F | Computer |\n| G | Math |\n| H | Math |\n| I | Math |\n+---------+----------+\n<strong>Output:</strong> \n+---------+\n| class |\n+---------+\n| Math |\n+---------+\n<strong>Explanation:</strong> \n- Math has 6 students, so we include it.\n- English has 1 student, so we do not include it.\n- Biology has 1 student, so we do not include it.\n- Computer has 1 student, so we do not include it.\n</pre>\n",
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"translatedTitle": "超过5名学生的课",
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"translatedContent": "<p>表: <code>Courses</code></p>\n\n<pre>\n+-------------+---------+\n| Column Name | Type |\n+-------------+---------+\n| student | varchar |\n| class | varchar |\n+-------------+---------+\n在 SQL 中，(student, class)是该表的主键列。\n该表的每一行表示学生的名字和他们注册的班级。\n</pre>\n\n<p> </p>\n\n<p>查询 <strong>至少有5个学生</strong> 的所有班级。</p>\n\n<p>以 <strong>任意顺序 </strong>返回结果表。</p>\n\n<p>查询结果格式如下所示。</p>\n\n<p> </p>\n\n<p><strong>示例 1:</strong></p>\n\n<pre>\n<strong>输入:</strong> \nCourses table:\n+---------+----------+\n| student | class |\n+---------+----------+\n| A | Math |\n| B | English |\n| C | Math |\n| D | Biology |\n| E | Math |\n| F | Computer |\n| G | Math |\n| H | Math |\n| I | Math |\n+---------+----------+\n<strong>输出:</strong> \n+---------+ \n| class | \n+---------+ \n| Math | \n+---------+\n<strong>解释: </strong>\n-数学课有6个学生，所以我们包括它。\n-英语课有1名学生，所以我们不包括它。\n-生物课有1名学生，所以我们不包括它。\n-计算机课有1个学生，所以我们不包括它。</pre>\n",
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"sampleTestCase": "{\"headers\": {\"Courses\": [\"student\", \"class\"]}, \"rows\": {\"Courses\": [[\"A\", \"Math\"], [\"B\", \"English\"], [\"C\", \"Math\"], [\"D\", \"Biology\"], [\"E\", \"Math\"], [\"F\", \"Computer\"], [\"G\", \"Math\"], [\"H\", \"Math\"], [\"I\", \"Math\"]]}}",
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"Create table If Not Exists Courses (student varchar(255), class varchar(255))",
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"insert into Courses (student, class) values ('A', 'Math')",
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"insert into Courses (student, class) values ('B', 'English')",
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"insert into Courses (student, class) values ('C', 'Math')",
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"insert into Courses (student, class) values ('D', 'Biology')",
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"insert into Courses (student, class) values ('E', 'Math')",
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"insert into Courses (student, class) values ('F', 'Computer')",
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"insert into Courses (student, class) values ('G', 'Math')",
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"insert into Courses (student, class) values ('H', 'Math')",
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"insert into Courses (student, class) values ('I', 'Math')"
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"exampleTestcases": "{\"headers\": {\"Courses\": [\"student\", \"class\"]}, \"rows\": {\"Courses\": [[\"A\", \"Math\"], [\"B\", \"English\"], [\"C\", \"Math\"], [\"D\", \"Biology\"], [\"E\", \"Math\"], [\"F\", \"Computer\"], [\"G\", \"Math\"], [\"H\", \"Math\"], [\"I\", \"Math\"]]}}",
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