sql 查询一行内几列的平均值,最大值,最小值,怎么写答:create table tb1(name varchar(50),num1 int,num2 int,num3 int,num4 int,num5 int,num6 int,num7 int)insert into tb1 select 'Tom',1,2,6,7,9,0,3 insert into tb1 select 'Jacky',7,6,5,4,3,2,1 结果:name maxnum minnum avgnum Jacky 7 1 4 Tom 9 0 4 ...