--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
--*/