各位好,请教一个查询判读的逻辑问题?????

[mylover002]

有如下资料
表: Table
字段: KeyID char(1)Primary Key, BDate datetime, EDate datetime
有资料为:
KeyID BDate EDdate
A 2007-10-01 2007-10-05
B 2007-10-10 2007-10-15
C 2007-10-16 2007-10-20
D 2007-10-22 2007-10-28

查询在某个日期范围内是否在表中都存在资料,如果都有这返回1,否则返回0
比如:
1. 查询 2007-10-02, 2007-10-04 在这两个日期范围内就存在有资料,
2. 查询 2007-10-04, 2007-10-15 在这两个日期范围内不是都有资料,比如2007-10-06就没有资料
如何写,请各位指点呀

[-狙击手-]

比如2007-10-06就没有资料

---
C 2007-10-16 2007-10-20
这一条怎么解释

[kk19840210]

select keyid,bdate,eddate,case when '2007-10-02'>=bdate and '2007-10-04'<=eddate then 1 else 0 end from table

[-狙击手-]

if exists(select 1 from table where @s >= bdate and @e <= edate)
   print '1'
else
   print '0'

这个意思？

[dawugui]

create table tb(KeyID varchar(10),BDate datetime,EDdate datetime)
insert into tb values('A',           '2007-10-01',             '2007-10-05') 
insert into tb values('B',           '2007-10-10',             '2007-10-15') 
insert into tb values('C',           '2007-10-16',             '2007-10-20') 
insert into tb values('D',           '2007-10-22',             '2007-10-28' )
go

SELECT TOP 1000 id = identity(int,0,1) INTO tmp FROM syscolumns a, syscolumns b

declare @dt1 as datetime
declare @dt2 as datetime
set @dt1 = '2007-10-02'
set @dt2 = '2007-10-04'

select a.* , m.返回 from tb a left join
(select distinct KeyID , 返回 = 1 from(select KeyID , dt = dateadd(day , tmp.id , BDate) from tb ,tmp where dateadd(day , tmp.id , BDate) <= EDdate) t where dt >= @dt1 and dt <= @dt2) m
on a.keyid = m.keyid
/*
KeyID      BDate                                                  EDdate                                                 返回          
---------- ------------------------------------------------------ ------------------------------------------------------ ----------- 
A          2007-10-01 00:00:00.000                                2007-10-05 00:00:00.000                                1
B          2007-10-10 00:00:00.000                                2007-10-15 00:00:00.000                                NULL
C          2007-10-16 00:00:00.000                                2007-10-20 00:00:00.000                                NULL
D          2007-10-22 00:00:00.000                                2007-10-28 00:00:00.000                                NULL

（所影响的行数为 4 行）

*/

set @dt1 = '2007-10-04'
set @dt2 = '2007-10-15'
select a.* , m.返回 from tb a left join
(select distinct KeyID , 返回 = 1 from(select KeyID , dt = dateadd(day , tmp.id , BDate) from tb ,tmp where dateadd(day , tmp.id , BDate) <= EDdate) t where dt >= @dt1 and dt <= @dt2) m
on a.keyid = m.keyid

/*
KeyID      BDate                                                  EDdate                                                 返回          
---------- ------------------------------------------------------ ------------------------------------------------------ ----------- 
A          2007-10-01 00:00:00.000                                2007-10-05 00:00:00.000                                1
B          2007-10-10 00:00:00.000                                2007-10-15 00:00:00.000                                1
C          2007-10-16 00:00:00.000                                2007-10-20 00:00:00.000                                NULL
D          2007-10-22 00:00:00.000                                2007-10-28 00:00:00.000                                NULL

（所影响的行数为 4 行）
*/


drop table tb,tmp

[dawugui]

create table tb(KeyID varchar(10),BDate datetime,EDdate datetime)
insert into tb values('A',           '2007-10-01',             '2007-10-05') 
insert into tb values('B',           '2007-10-10',             '2007-10-15') 
insert into tb values('C',           '2007-10-16',             '2007-10-20') 
insert into tb values('D',           '2007-10-22',             '2007-10-28' )
go

SELECT TOP 1000 id = identity(int,0,1) INTO tmp FROM syscolumns a, syscolumns b

declare @dt1 as datetime
declare @dt2 as datetime
set @dt1 = '2007-10-02'
set @dt2 = '2007-10-04'

select a.* , 返回 = case when m.keyid  is not null then 1 else 0 end from tb a 
left join
(select distinct KeyID from(select KeyID , dt = dateadd(day , tmp.id , BDate) from tb ,tmp where dateadd(day , tmp.id , BDate) <= EDdate) t where dt >= @dt1 and dt <= @dt2) m
on a.keyid = m.keyid
/*
KeyID      BDate                                                  EDdate                                                 返回          
---------- ------------------------------------------------------ ------------------------------------------------------ ----------- 
A          2007-10-01 00:00:00.000                                2007-10-05 00:00:00.000                                1
B          2007-10-10 00:00:00.000                                2007-10-15 00:00:00.000                                0
C          2007-10-16 00:00:00.000                                2007-10-20 00:00:00.000                                0
D          2007-10-22 00:00:00.000                                2007-10-28 00:00:00.000                                0

（所影响的行数为 4 行）
*/

set @dt1 = '2007-10-04'
set @dt2 = '2007-10-15'
select a.* , 返回 = case when m.keyid  is not null then 1 else 0 end from tb a 
left join
(select distinct KeyID from(select KeyID , dt = dateadd(day , tmp.id , BDate) from tb ,tmp where dateadd(day , tmp.id , BDate) <= EDdate) t where dt >= @dt1 and dt <= @dt2) m
on a.keyid = m.keyid
/*
KeyID      BDate                                                  EDdate                                                 返回          
---------- ------------------------------------------------------ ------------------------------------------------------ ----------- 
A          2007-10-01 00:00:00.000                                2007-10-05 00:00:00.000                                1
B          2007-10-10 00:00:00.000                                2007-10-15 00:00:00.000                                1
C          2007-10-16 00:00:00.000                                2007-10-20 00:00:00.000                                0
D          2007-10-22 00:00:00.000                                2007-10-28 00:00:00.000                                0

（所影响的行数为 4 行）
*/


drop table tb,tmp

[pt1314917]

create table tab(keyid char(1)primary key,bdate datetime,edate datetime)
insert into tab select 'A','2007-10-01','2007-10-05'
insert into tab select 'B','2007-10-10','2007-10-15'
insert into tab select 'C','2007-10-16','2007-10-20'
insert into tab select 'D','2007-10-22','2007-10-28'

alter function IsExists(@bdate datetime,@edate datetime)
returns int
as
begin
	declare @t1 table(data datetime)
	declare @t2 table(data datetime)
	while(datediff(dd,@bdate,@edate)>=0)
	begin
		insert into @t1 select @bdate
		set @bdate=dateadd(dd,1,@bdate)	
	end
	declare @b datetime
	declare @e datetime
	declare cur cursor for select bdate,edate from tab
	open cur
	fetch next from cur into @b,@e
	while(@@fetch_status=0)
	begin
		while(datediff(dd,@b,@e)>=0)
		begin
			insert into @t2 select @b
			set @b=dateadd(dd,1,@b)	
		end
		fetch next from cur into @b,@e
	end
	close cur
	deallocate cur
	declare @cnt int
	select @cnt=count(1) from @t1 a where not exists (select 1 from @t2 where data=a.data)
	if(@cnt!=0)
		set @cnt=0
	else
		set @cnt=1
	return @cnt
end

select dbo.IsExists('2007-10-02','2007-10-04')--返回1
select dbo.IsExists('2007-10-04','2007-10-15')--返回0

[-狙击手-]

create table tb(KeyID varchar(10),BDate datetime,Edate datetime)
insert into tb values('A',           '2007-10-01',             '2007-10-05') 
insert into tb values('B',           '2007-10-10',             '2007-10-15') 
insert into tb values('C',           '2007-10-16',             '2007-10-20') 
insert into tb values('D',           '2007-10-22',             '2007-10-28' )
go


declare @dt1 as datetime
declare @dt2 as datetime
set @dt1 = '2007-10-16'
set @dt2 = '2007-10-17'

if exists(select 1 from tb where @dt1 between  bdate and edate and @dt2 between  bdate and edate)
   print '1'
else
   print '0'

drop table tb

[mylover002]

谢谢各位的赐教,经过测试,
背着灵魂漫步,写的函数可以满足我的需求