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19.Students With Invalid Departments Table:Departments +---------------+...
12.Friend Requests I: Overall Acceptance Rate In social network like Fac...
44.Number of Comments per Post Table:Submissions +---------------+------...
7题属于delete题型，很少用到，先跳过。 8.Rising Temperature id is the primary key for th...
1. Second Highest Salary Write a SQL query to get the second highest sal...