The Second Floor of the library in Clean the Library only has 6 sections: 2A, 2B, 2C, 2D, 2E, and 2F. See the table below to learn which category (and books) go in which section.
-- 查询1：多表连接，查询当前逾期未归还图书及对应读者、联系方式、应还日期和逾期天数。
-- Provide aliases for the "age" and "salary" columns as "Employee_Age" and "Employee_Salary", respectively.
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