sql中一对多关系的查询结果的多行转换成一行多列答:1、创建测试表,create table test_fee(userid number, feeid number, fee number);2、插入测试数据 insert into test_fee values(1,1001,80);insert into test_fee values(1,1002,70);insert into test_fee values(1,1003,90);insert into test_fee values(1,1004,60);insert into test_fe...