1.获取近十二个月 var dataArr = []; var data = new Date(); var year = data.getFullYear(); data.setMonth(data.getMonth()+1, 1) //获取到当前月份,设置月份 for (var i = 0; i < 12; i++) { data.setMonth(data.getMonth() - 1); //每次循环一次 月份值减1 var m = data.getMonth() + 1; m = m
select * from( select sum(case MONTH(purchase_date) when '1' then SumMoney else 0 end) as January,sum(case MONTH(purchase_date) when '2' then SumMoney else 0 end) as February,sum(case MONTH(purchase_date) when '3' then SumMoney else 0 end) as Marc
问题及代码: (1)程序执行后,运行结果是多少? (2)将程序中有注释的两条语句修改为注释的内容,即将"class B:public A {};"修改为"class B:virtual public A{};","class C:public A {}; "修改为"class C:virtual public A{};",重新编译运行程序,程序的运行结果又是多少? #include<iostream> using