sql中一对多关系的查询结果的多行转换成一行多列

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