leetcode-problemset/leetcode/originData/number-of-unique-subjects-taught-by-each-teacher.json

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            "title": "Number of Unique Subjects Taught by Each Teacher",
            "titleSlug": "number-of-unique-subjects-taught-by-each-teacher",
            "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>&nbsp;</p>\n\n<p>Write a solution to calculate&nbsp;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&nbsp;result format is shown in the following example.</p>\n\n<p>&nbsp;</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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                    "code": "import pandas as pd\n\ndef count_unique_subjects(teacher: pd.DataFrame) -> pd.DataFrame:\n    ",
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                "Create table If Not Exists Teacher (teacher_id int, subject_id int, dept_id int)",
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                "insert into Teacher (teacher_id, subject_id, dept_id) values ('1', '2', '3')",
                "insert into Teacher (teacher_id, subject_id, dept_id) values ('1', '2', '4')",
                "insert into Teacher (teacher_id, subject_id, dept_id) values ('1', '3', '3')",
                "insert into Teacher (teacher_id, subject_id, dept_id) values ('2', '1', '1')",
                "insert into Teacher (teacher_id, subject_id, dept_id) values ('2', '2', '1')",
                "insert into Teacher (teacher_id, subject_id, dept_id) values ('2', '3', '1')",
                "insert into Teacher (teacher_id, subject_id, dept_id) values ('2', '4', '1')"
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