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Description:Given a Weather table, write a SQL query to find all dates' Ids with higher temperature compared to its previous (yesterday's) dates. 选出比... 阅读全文
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Discription:Write a SQL query to delete all duplicate email entries in a table named Person, keeping only unique emails based on its smallest Id. 删除重... 阅读全文
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Description: Suppose that a website contains two tables, the Customers table and the Orders table. Write a SQL query to find all customers who never ... 阅读全文