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Tricky query

Author

Topic

PeterNeo
Constraint Violating Yak Guru

357 Posts

Posted - 2007-06-12 : 09:50:49

Hi,

I have strange requirement.

Declare @t table ( id int, time varchra(10), patient int, check int )

Insert into @t
Select 1, '7:00AM', 1, 1 Union all
Select 2, '7:30AM', 1, 2 Union all
Select 3, '8:00AM', 1, 3 Union all
Select 4, '8:30AM', null, null Union all
Select 5, '9:00AM', 2, 1 Union all
Select 6, '7:00AM', 2, 2

Now my desired output is

1, '7:00AM', 1, 1, "1,2,3"
2, '7:30AM', 1, 2, "1,2,3"
3, '8:00AM', 1, 3, "1,2,3"
4, '8:30AM', null, null, null,
5, '9:00AM', 2, 1, "1,2"
6, '7:00AM', 2, 2, "1,2"

Thanks in advance

nr
SQLTeam MVY

12543 Posts

Posted - 2007-06-12 : 10:26:58

You need to concatenate the check's which can't be done without a function or loop unless you have a limit on the number.
This is for the function which means a table rather than temp table.

create table t ( id int, time varchar(10), patient int, [check] int )
Insert into t
Select 1, '7:00AM', 1, 1 Union all
Select 2, '7:30AM', 1, 2 Union all
Select 3, '8:00AM', 1, 3 Union all
Select 4, '8:30AM', null, null Union all
Select 5, '9:00AM', 2, 1 Union all
Select 6, '7:00AM', 2, 2

create function fn_concatpatients
(
@minid int ,
@maxid int
)
returns varchar(1000)
as
begin
declare @s varchar(1000)
select @s = coalesce(@s+',','') + convert(varchar(10),[check])
from t
where id between @minid and @maxid
return @s
end
go

select t.id, t.time, t.Patient, t.[check], dbo.fn_concatpatients(t2.minid, t2.maxid)
from t t
join
(select minid = min(id), maxid = max(id) from
(select t.id, grp = (select count(distinct coalesce(patient,-1)) from t t2 where t2.id <= t.id)
from t t
) t group by grp) t2
on t.id between t2.minid and t2.maxid

==========================================
Cursors are useful if you don't know sql.
DTS can be used in a similar way.
Beer is not cold and it isn't fizzy.

pbguy
Constraint Violating Yak Guru

319 Posts

Posted - 2007-06-13 : 00:16:31

t2 derived query can be replaced with

Select min([id]) as minid, max([id]) as maxid from t
group by patient

--------------------------------------------------
S.Ahamed

nr
SQLTeam MVY

12543 Posts

Posted - 2007-06-13 : 10:00:42

quote:
Originally posted by pbguy

t2 derived query can be replaced with

Select min([id]) as minid, max([id]) as maxid from t
group by patient

--------------------------------------------------
S.Ahamed

Not it can't - if the same patient left and came back later in the day that query would show that they had never left.

==========================================
Cursors are useful if you don't know sql.
DTS can be used in a similar way.
Beer is not cold and it isn't fizzy.

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