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https://gitee.com/coder-xiaomo/leetcode-problemset
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94 lines
9.0 KiB
JSON
94 lines
9.0 KiB
JSON
{
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"data": {
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"question": {
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"questionId": "2495",
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"questionFrontendId": "2356",
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"categoryTitle": "Database",
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"boundTopicId": 1706030,
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"title": "Number of Unique Subjects Taught by Each Teacher",
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"titleSlug": "number-of-unique-subjects-taught-by-each-teacher",
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"content": "<p>Table: <code>Teacher</code></p>\n\n<pre>\n+-------------+------+\n| Column Name | Type |\n+-------------+------+\n| teacher_id | int |\n| subject_id | int |\n| dept_id | int |\n+-------------+------+\n(subject_id, dept_id) is the primary key (combinations of columns with unique values) of this table.\nEach row in this table indicates that the teacher with teacher_id teaches the subject subject_id in the department dept_id.\n</pre>\n\n<p> </p>\n\n<p>Write a solution to calculate the number of unique subjects each teacher teaches in the university.</p>\n\n<p>Return the result table in <strong>any order</strong>.</p>\n\n<p>The result format is shown 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> \nTeacher table:\n+------------+------------+---------+\n| teacher_id | subject_id | dept_id |\n+------------+------------+---------+\n| 1 | 2 | 3 |\n| 1 | 2 | 4 |\n| 1 | 3 | 3 |\n| 2 | 1 | 1 |\n| 2 | 2 | 1 |\n| 2 | 3 | 1 |\n| 2 | 4 | 1 |\n+------------+------------+---------+\n<strong>Output:</strong> \n+------------+-----+\n| teacher_id | cnt |\n+------------+-----+\n| 1 | 2 |\n| 2 | 4 |\n+------------+-----+\n<strong>Explanation:</strong> \nTeacher 1:\n - They teach subject 2 in departments 3 and 4.\n - They teach subject 3 in department 3.\nTeacher 2:\n - They teach subject 1 in department 1.\n - They teach subject 2 in department 1.\n - They teach subject 3 in department 1.\n - They teach subject 4 in department 1.\n</pre>\n",
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"translatedTitle": "每位教师所教授的科目种类的数量",
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"translatedContent": "<p>表: <code>Teacher</code></p>\n\n<pre>\n+-------------+------+\n| Column Name | Type |\n+-------------+------+\n| teacher_id | int |\n| subject_id | int |\n| dept_id | int |\n+-------------+------+\n在 SQL 中，(subject_id, dept_id) 是该表的主键。\n该表中的每一行都表示带有 teacher_id 的教师在系 dept_id 中教授科目 subject_id。\n</pre>\n\n<p> </p>\n\n<p>查询每位老师在大学里教授的科目种类的数量。</p>\n\n<p data-group=\"1-1\">以 <strong>任意顺序</strong> 返回结果表。</p>\n\n<p>查询结果格式示例如下。</p>\n\n<p> </p>\n\n<p><strong>示例 1:</strong></p>\n\n<pre>\n<strong>输入:</strong> \nTeacher 表:\n+------------+------------+---------+\n| teacher_id | subject_id | dept_id |\n+------------+------------+---------+\n| 1 | 2 | 3 |\n| 1 | 2 | 4 |\n| 1 | 3 | 3 |\n| 2 | 1 | 1 |\n| 2 | 2 | 1 |\n| 2 | 3 | 1 |\n| 2 | 4 | 1 |\n+------------+------------+---------+\n<strong>输出:</strong> \n+------------+-----+\n| teacher_id | cnt |\n+------------+-----+\n| 1 | 2 |\n| 2 | 4 |\n+------------+-----+\n<strong>解释:</strong> \n教师 1:\n - 他在 3、4 系教科目 2。\n - 他在 3 系教科目 3。\n教师 2:\n - 他在 1 系教科目 1。\n - 他在 1 系教科目 2。\n - 他在 1 系教科目 3。\n - 他在 1 系教科目 4。</pre>\n",
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"difficulty": "Easy",
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"lang": "Oracle",
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"code": "/* Write your PL/SQL query statement below */",
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"lang": "Pandas",
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"code": "import pandas as pd\n\ndef count_unique_subjects(teacher: pd.DataFrame) -> pd.DataFrame:\n ",
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"sampleTestCase": "{\"headers\":{\"Teacher\":[\"teacher_id\",\"subject_id\",\"dept_id\"]},\"rows\":{\"Teacher\":[[1,2,3],[1,2,4],[1,3,3],[2,1,1],[2,2,1],[2,3,1],[2,4,1]]}}",
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"Create table If Not Exists Teacher (teacher_id int, subject_id int, dept_id int)",
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"Truncate table Teacher",
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"insert into Teacher (teacher_id, subject_id, dept_id) values ('1', '2', '3')",
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"insert into Teacher (teacher_id, subject_id, dept_id) values ('1', '2', '4')",
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"insert into Teacher (teacher_id, subject_id, dept_id) values ('1', '3', '3')",
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"insert into Teacher (teacher_id, subject_id, dept_id) values ('2', '1', '1')",
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"insert into Teacher (teacher_id, subject_id, dept_id) values ('2', '2', '1')",
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"insert into Teacher (teacher_id, subject_id, dept_id) values ('2', '3', '1')",
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"insert into Teacher (teacher_id, subject_id, dept_id) values ('2', '4', '1')"
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"style": "LEETCODE",
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"exampleTestcases": "{\"headers\":{\"Teacher\":[\"teacher_id\",\"subject_id\",\"dept_id\"]},\"rows\":{\"Teacher\":[[1,2,3],[1,2,4],[1,3,3],[2,1,1],[2,2,1],[2,3,1],[2,4,1]]}}",
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