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数据分析框架数据分析框架——AARRR模型 数据分析框架的作用 保证结果的准确性、可靠性、针对性 常见的分析框架(宏观，适用于管理和运营) （1）PEST分...
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180612_Nth_highest
Write a SQL query to get the nth highest salary from the Employee table....
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180612_SELECT certain ITEM
X city opened a new cinema, many people would like to go to this cinema....
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180612_SELECT consecutive rows
X city built a new stadium, each day many people visit it and the stats ...
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180608_exchange_data
Mary is a teacher in a middle school and she has a table seat storing st...
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180608_group_compare
The Employee table holds all employees including their managers. Every e...
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180608_find_duplicate
Write a SQL query to find all duplicate emails in a table named Person. ...
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180607_top3items
The Employee table holds all employees. Every employee has an Id, and th...
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180607_Highest
The Employee table holds all employees. Every employee has an Id, a sala...