Oracle复杂查询练习题
bookEnrol是用来登记的，不管你是借还是还，都要添加一条记录。请写一个SQL语句，获取到现在状态为已借出的所有图书的相关信息，
1.删除重复记录(当表中无主键时)
2.bookEnrol是用来登记的，，不管你是借还是还，都要添加一条记录。
请写一个SQL语句，获取到现在状态为已借出的所有图书的相关信息，
ID为3的java书，由于以归还，所以不要查出来。要求查询结果应为：(被借出的书和被借出的日期)
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