求大神帮助写出这个sql（统计-按天按月按年）
预约表 CGA_subscribe
英文列名中文列名数据类型长度允许空默认值字段说明
id序号VARCHAR36PK主键 UUID
name预约名称VARCHAR36否
orderType预约渠道int0 网上预约1 电话预约2 现场预约
orderTime预约时间VARCHAR30否2012-05-01-1（1上午 2下午）
| | | |
| |变成如下表| |
| | | |
V V V V
---------------------
预约情况 按天 按月 按年
现场预约数300 400 500
电话预约数1000 1200 1500
网上预约数500 600 700
总数 1800 2200 2700
---------------------
PS:求大神们帮助,跪谢..~尽快哦,在线等.
[解决办法]
------------------------------ Author :fredrickhu(小F，向高手学习)-- Date :2012-07-18 15:01:02-- Version:-- Microsoft SQL Server 2008 R2 (RTM) - 10.50.1617.0 (Intel X86) -- Apr 22 2011 11:57:00 -- Copyright (c) Microsoft Corporation-- Enterprise Edition on Windows NT 6.1 <X64> (Build 7600: ) (WOW64)--------------------------------> 测试数据：[tb]if object_id('[tb]') is not null drop table [tb]go create table [tb]([id] int,[name] varchar(14),[ordertype] int,[ordertime] datetime)insert [tb]select 1,'某公司的预约',0,'2012-5-29' union allselect 2,'某个人的预约',1,'2012-5-30' union allselect 3,'某集团1的预约',0,'2012-5-31' union allselect 4,'某集团2的预约',1,'2012-6-1' union allselect 5,'某集团3的预约',1,'2012-6-2' union allselect 6,'某集团4的预约',1,'2012-6-3' union allselect 7,'某集团5的预约',1,'2012-6-4' union allselect 8,'某集团6的预约',1,'2012-6-5' union allselect 9,'某集团7的预约',0,'2012-6-6' union allselect 10,'某集团8的预约',0,'2012-6-7' union allselect 11,'某集团9的预约',0,'2012-6-8' union allselect 12,'某集团10的预约',2,'2012-6-2' union allselect 13,'某集团11的预约',2,'2012-6-12' union allselect 14,'某集团12的预约',2,'2012-6-12'--------------开始查询--------------------------select isnull((case when ordertype=2 then '现场预约' when ordertype=1 then '电话预约' when ordertype=0 then '网上预约' else null end) ,'总数') as 预约情况, sum(case when datediff(dd,orderTime,getdate())=0 then 1 else 0 end) as 按天, sum(case when datediff(mm,orderTime,getdate())=0 then 1 else 0 end) as 按月, sum(case when datediff(yy,orderTime,getdate())=0 then 1 else 0 end) as 按年from tbgroup by isnull((case when ordertype=2 then '现场预约' when ordertype=1 then '电话预约' when ordertype=0 then '网上预约' end) ,'总数')with rollup----------------结果----------------------------/* 预约情况 按天 按月 按年-------- ----------- ----------- -----------电话预约 0 0 6网上预约 0 0 5现场预约 0 0 3NULL 0 0 14(4 行受影响)*/