MySQL Solution for Classes More than 5 Students Problem
Intuition\n Describe your first thoughts on how to solve this problem. \nThe given SQL query selects the distinct class names from the "courses" table where the
# Intuition\n<!-- Describe your first thoughts on how to solve this problem. -->\nThe given SQL query selects the distinct class names from the "courses" table where the count of distinct students enrolled in each class is greater than or equal to 5.\n\n# Approach\n<!-- Describe your approach to solving the problem. -->\n1. The query starts with the SELECT keyword followed by the column name class.\n2. It specifies the table name courses.\n3. The GROUP BY clause is used to group the records by the class column.\n4. The HAVING clause filters the grouped records based on the condition count(distinct student) >= 5.\n- count(distinct student) calculates the number of distinct students in each class.\n- The condition >= 5 ensures that only classes with at least 5 distinct students are included in the result.\n\n# Complexity\n- Time complexity:\n<!-- Add your time complexity here, e.g. $$O(n)$$ -->\nThe time complexity of this query depends on the size of the "courses" table and the number of distinct classes. It involves grouping the records and performing the count of distinct students for each class. The time complexity is typically determined by the efficiency of the database engine\'s grouping and aggregation operations. Assuming appropriate indexing is in place, the time complexity is often linear or close to linear in the size of the "courses" table.\n\n- Space complexity:\n<!-- Add your space complexity here, e.g. $$O(n)$$ -->\nThe space complexity of the query depends on the number of distinct classes that satisfy the condition count(distinct student) >= 5. The database engine needs to store the intermediate results of grouping and counting the distinct students. The space complexity is proportional to the number of distinct classes returned in the result set.\n\n# Code\n```\n# Write your MySQL query statement below\nselect class from courses group by class having count(distinct student) >= 5;\n```
['MySQL']