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问题：（MYSQL）编写存储过程,实现求一元二次方程的根（假设该方程有实数根）.
答案：↓↓↓ 钱振雄的回答： 网友采纳 曾经写过一个,你看看,你最好弄个实际需求,也好帮你 已知(a*7+b*9+c*10+d*5+222)%11=3,a,b,c,d都是0-9的整数,怎么用sql输出a,b,c,d的所有结果 declare @a int declare @b int declare @c int declare @d int declare @str int set @str=0 while @str<=9999 begin set @a=cast(substring(right('0000'+cast(cast(@str as varchar) as varchar),4),1,1) as int) set @b=cast(substring(right('0000'+cast(cast(@str as varchar) as varchar),4),2,1) as int) set @c=cast(substring(right('0000'+cast(cast(@str as varchar) as varchar),4),3,1) as int) set @d=cast(substring(right('0000'+cast(cast(@str as varchar) as varchar),4),4,1) as int) if (@a*7+@b*9+@c*10+@d*5+222)%11=3 begin print ('a='+cast(@a as varchar)+' b='+cast(@b as varchar)+' c='+cast(@c as varchar)+' d='+cast(@d as varchar)) end set @str=@str+1 end sqlserver中直接运行即可,mysql的你也就照着改一下吧 | 
