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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...

  • 180612_Nth_highest

    Write a SQL query to get the nth highest salary from the Employee table....

  • 180612_SELECT certain ITEM

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

  • 180612_SELECT consecutive rows

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

  • 180608_exchange_data

    Mary is a teacher in a middle school and she has a table seat storing st...

  • 180608_group_compare

    The Employee table holds all employees including their managers. Every e...

  • 180608_find_duplicate

    Write a SQL query to find all duplicate emails in a table named Person. ...

  • 180607_top3items

    The Employee table holds all employees. Every employee has an Id, and th...

  • 180607_Highest

    The Employee table holds all employees. Every employee has an Id, a sala...