摘要： 一：代码如下：建表：create table test(id number,mc number,sl number)插数：insert into test values(2,110,1);insert into test values(1,111,1);insert into test values(2,555,2);insert into test values(1,222,1);insert into test values(2,333,2);insert into test values(1,666,3);insert into test values(1,333,2);insert i 阅读全文