统计--交叉表+日期+优先.sql

很好的sql 文档,可能邦你成为sql 高手

--交叉表,根据优先级取数据,日期处理

create table tb(qid int,rid nvarchar(4),tagname nvarchar(10),starttime smalldatetime,endtime smalldatetime,startweekday int,endweekday int,startdate smalldatetime,enddate smalldatetime,d int)
insert tb select 1,'A1','未订','08:00','09:00',1   ,5   ,null       ,null       ,1
union all select 1,'A1','未订','09:00','10:00',1   ,5   ,null       ,null       ,1
union all select 1,'A1','未订','10:00','11:00',1   ,5   ,null       ,null       ,1
union all select 1,'A1','装修','08:00','09:00',null,null,'2005-1-18','2005-1-19',2 
--union all select 1,'A1','装修','09:00','10:00',null,null,'2005-1-18','2005-1-19',2
union all select 1,'A1','装修','10:00','11:00',null,null,'2005-1-18','2005-1-19',2
union all select 1,'A2','未订','08:00','09:00',1   ,5   ,null       ,null       ,1
union all select 1,'A2','未订','09:00','10:00',1   ,5   ,null       ,null       ,1
union all select 1,'A2','未订','10:00','11:00',1   ,5   ,null       ,null       ,1
--union all select 1,'A2','装修','08:00','09:00',null,null,'2005-1-18','2005-1-19',2
union all select 1,'A2','装修','09:00','10:00',null,null,'2005-1-18','2005-1-19',2
--union all select 1,'A2','装修','10:00','11:00',null,null,'2005-1-18','2005-1-19',2
go

/*--楼主这个问题要考虑几个方面

	1. 取星期时,set datefirst 的影响
	2. 优先级问题
	3. qid,rid 应该是未知的(动态变化的)
--*/

--实现的存储过程如下
create proc p_qry
@date smalldatetime --要查询的日期
as
set nocount on
declare @week int,@s nvarchar(4000)
--格式化日期和得到星期
select @date=convert(char(10),@date,120)
	,@week=(@@datefirst+datepart(weekday,@date)-1)%7
	,@s=''
select id=identity(int),* into #t
from(
	select top 100 percent
		qid,rid,tagname,
		starttime=convert(char(5),starttime,108),
		endtime=convert(char(5),endtime,108)
	from tb
	where (@week between startweekday and endweekday)
		or(@date between startdate and enddate)
	order by qid,rid,starttime,d desc)a

select @s=@s+N',['+rtrim(rid)
	+N']=max(case when qid='+rtrim(qid)
	+N' and rid=N'''+rtrim(rid)
	+N''' then tagname else N'''' end)'
from #t group by qid,rid
exec('
select starttime,endtime'+@s+' 
from #t a
where not exists(
	select * from #t
	where qid=a.qid and rid=a.rid 
		and starttime=a.starttime
		and endtime=a.endtime
		and id<a.id)
group by starttime,endtime')
go

--调用
exec p_qry '2005-1-17'
exec p_qry '2005-1-18'
go

--删除测试
drop table tb
drop proc p_qry

/*--测试结果

starttime endtime A1         A2         
--------- ------- ---------- ---------- 
08:00     09:00   未订         未订
09:00     10:00   未订         未订
10:00     11:00   未订         未订

starttime endtime A1         A2         
--------- ------- ---------- ---------- 
08:00     09:00   装修         未订
09:00     10:00   未订         装修
10:00     11:00   装修         未订
--*/