SQL 日。年。月。星期

switch (selecttime)
                {
                    case -1: where = "1=1";
                        break;
                    case 1: where = "Day(CreateTime)=Day(getdate())";
                        break;
                    case 2: where = "datepart(week,CreateTime)=datepart(week,getdate())";
                        break;
                    case 3: where = "month(CreateTime)=month(getdate())";
                        break;
                    case 4: where = "year(CreateTime)=year(getdate())";
                        break;

                   default:
                        break;

                }