摘要： create table t1(c1 int ,c2 int)insert t1(c1,c2) values(5,10)insert t1(c1,c2) values(3,20)insert t1(c1,c2) values(4,30)insert t1(c1,c2) values(2,40)insert t1(c1,c2) values(1,50)select * from t1c1 c2---... 阅读全文