19.Students With Invalid Departments Table:Departments +---------------+---------+ | Co...
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2020-08-26 easy 19-43
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2020-08-23 easy 12-18 类比ing
12.Friend Requests I: Overall Acceptance Rate In social network like Facebook or Twitte...
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2020-08-27 easy 44-51
44.Number of Comments per Post Table:Submissions +---------------+----------+ | Column ...
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2020-08-21 easy 7-11
7题属于delete题型，很少用到，先跳过。 8.Rising Temperature id is the primary key for this table. This ...
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2020-08-21 easy 1-6
1. Second Highest Salary Write a SQL query to get the second highest salary from theEmp...