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Given a Weather table, write a SQL query to find all dates' Ids with higher temperature compared to its previous (yesterday's) dates. For example, ret 阅读全文
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题目 There is a table courses with columns: student and class Please list out all classes which have more than or equal to 5 students. For example, the 阅读全文
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题目 Suppose that a website contains two tables, the Customers table and the Orders table. Write a SQL query to find all customers who never order anyth 阅读全文
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题目来源于leetcode中的数据库部分:181. Employees Earning More Than Their Managers 题目:The Employee table holds all employees including their managers. Every employe 阅读全文
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Calculate the sum of two integers a and b, but you are not allowed to use the operator + and -. Example:Given a = 1 and b = 2, return 3. 思路: 这里用到了一个半加 阅读全文