郑磊_4135

Write a SQL query to get the nth highest salary from the Employee table. For example, g...

郑磊_4135

X city opened a new cinema, many people would like to go to this cinema. The cinema als...

郑磊_4135

X city built a new stadium, each day many people visit it and the stats are saved as th...

郑磊_4135

Mary is a teacher in a middle school and she has a table seat storing students' names a...

郑磊_4135

The Employee table holds all employees including their managers. Every employee has an ...

郑磊_4135

Write a SQL query to find all duplicate emails in a table named Person. For example, yo...

郑磊_4135

The Employee table holds all employees. Every employee has an Id, and there is also a c...

郑磊_4135

The Employee table holds all employees. Every employee has an Id, a salary, and there i...

郑磊_4135

Write a SQL query to delete all duplicate email entries in a table named Person, keepin...

郑磊_4135

I really didn’t know why I want to write something down recently. Today I supposed to f...

郑磊_4135

合并后，查找未出现的ID Suppose that a website contains two tables, the Customers table and the Or...

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连续出现几次 Write a SQL query to find all numbers that appear at least three times consecuti...

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Table: Person PersonId is the primary key column for this table.Table: Address AddressI...

郑磊_4135

I felt good today. Until now, I think I did my job as the planning list. The only thing...