Selecting TOP X Child Records For A Parent Record

Oct 29, 2006

Hi,

I have a stored procedure that has to extract the child records for
particular parent records.

The issue is that in some cases I do not want to extract all the child
records only a certain number of them.

Firstly I identify all the parent records that have the requird number
of child records and insert them into the result table.

insert into t_AuditQualifiedNumberExtractDetails
(BatchNumber,
EntryRecordID,
LN,
AdditionalQualCritPassed)
(select t1.BatchNumber,
t1.EntryRecordID,
t1.LN,
t1.AdditionalQualCritPassed
from
(select BatchNumber,
RecordType,
EntryRecordID,
LN,
AdditionalQualCritPassed
from t_AuditQualifiedNumberExtractDetails_Temp) as t1
inner join
(select BatchNumber,
RecordType,
EntryRecordID,
Count(*) as AssignedNumbers,
max(TotalNumbers) as TotalNumbers
from t_AuditQualifiedNumberExtractDetails_Temp
group by BatchNumber, RecordType, EntryRecordID
having count(*) = max(TotalNumbers)) as t2
on t1.BatchNumber = t2.BatchNumber
and t1.RecordType = t2.RecordType
and t1.EntryRecordID = t2.EntryRecordID)

then insert the remaining records into a temp table where the number of
records required does not equal the total number of child records, and
thenloop through each record manipulating the ROWNUMBER to only select
the number of child records needed.

insert into @t_QualificationMismatchedAllocs
([BatchNumber],
[RecordType],
[EntryRecordID],
[AssignedNumbers],
[TotalNumbers])
(select BatchNumber,
RecordType,
EntryRecordID,
Count(*) as AssignedNumbers,
max(TotalNumbers) as TotalNumbers
from t_AuditQualifiedNumberExtractDetails_Temp
group by BatchNumber, RecordType, EntryRecordID
having count(*) <max(TotalNumbers))

SELECT @QualificationMismatched_RowCnt = 1

SELECT @MaxQualificationMismatched = (select count(*) from
@t_QualificationMismatchedAllocs)

while @QualificationMismatched_RowCnt <= @MaxQualificationMismatched
begin
--## Get Prize Draw to extract numbers for
select @RecordType = RecordType,
@EntryRecordID = EntryRecordID,
@AssignedNumbers = AssignedNumbers,
@TotalNumbers = TotalNumbers
from @t_QualificationMismatchedAllocs
where QualMismatchedAllocsRowNum = @QualificationMismatched_RowCnt

SET ROWCOUNT @TotalNumbers

insert into t_AuditQualifiedNumberExtractDetails
(BatchNumber,
EntryRecordID,
LN,
AdditionalQualCritPassed)
(select BatchNumber,
EntryRecordID,
LN,
AdditionalQualCritPassed
from t_AuditQualifiedNumberExtractDetails_Temp
where RecordType = @RecordType
and EntryRecordID = @EntryRecordID)

SET @QualificationMismatched_RowCnt =

QualificationMismatched_RowCnt + 1
SET ROWCOUNT 0
end

Is there a better methodology for doing this .....

Is the use of a table variable here incorrect ?

Should I be using a temporary table or indexed table if there are a
large number of parent records where the child records required does
not match the total number of child records ?

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1
(2) can be neglected

input 7
2
5
1
(2) can be neglected

input 8
7
2
5
(2) can be neglected


Plz help we to write the sql statements

Thanks

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Aug 2, 2007

I am designing a table to represent data in hierarchy structure, I use id and parent id to represent the data in hierarchy form:

Id | parent_id
---+-----------
1 | 0
2 | 0
3 | 0
4 | 1
5 | 1
6 | 4
7 | 4
8 | 7
9 | 7


This structure requires complicated queries (recursive call) to find out all the child of a root node, so I have added another field for the root id.
Is this a good relational database design ? kindly suggest.

Id | parent_id | root_id
---+-----------+---------
1 | 0 |
2 | 0 |
3 | 0 |
4 | 1 | 1
5 | 1 | 1
6 | 4 | 1
7 | 4 | 1
8 | 7 | 1
9 | 7 | 1
10 | 2 | 2
11 | 2 | 2
12 | 10 | 2
13 | 10 | 2

Rgds
Vijay

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Jul 20, 2005

In our database we have a list of devices in a "Device" Table, eachhaving one or more IP's located in the "IP" Table linked through aforein key on the DeviceID Column.I would like to retrieve this information as SuchDeviceID IpAddress1 10.0.0.1, 10.0.0.2, 10.0.0.32 ...345etc.Is it possible to do that without using cursors? Through a query?

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Nov 1, 2007

I have table "Clients" who have associated records in table "Mailings"
I want to populate a gridview using a single query that grabs all the info I need so that I may utilize the gridview's built in sorting.
I'm trying to return records containing the next upcoming mailing for each client.
 
The closest I can get is below:
I'm using GROUP BY because it allows me to return a single record for each client and the MIN part allows me to return the associated record in the mailings table for each client that contains the next upcoming 'send_date' 
 
SELECT MIN(dbo.tbl_clients.client_last_name) AS exp_last_name, MIN(dbo.tbl_mailings.send_date) AS exp_send_date, MIN(dbo.tbl_mailings.user_id) AS exp_user_id, dbo.tbl_clients.client_id, MIN(dbo.tbl_mailings.mailing_id) AS exp_mailing_idFROM dbo.tbl_clients INNER JOIN
dbo.tbl_mailings ON dbo.tbl_clients.client_id = dbo.tbl_mailings.client_idWHERE (dbo.tbl_mailings.user_id = 1000)GROUP BY dbo.tbl_clients.client_id
The user_id set at 1000 part is what makes it rightly pull in all clients for a particular user. Problem is, by using the GROUP BY statement I'm just getting the lowest 'mailing_id' number and NOT the actual entry associated with mailing item I want to return.  Same goes for the last_name field.   Perhaps I need to have a subquery within my WHERE clause?Or am I barking up the wrong tree entirely..

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May 9, 2006

I am having problems creating a trigger in SQL Server? I have 2 tables (parent and child) with one to many relationship. When I save a record, one row gets inserted in the parent and one to many gets inserted in the child. The trigger is on the parent table and it is trying to select the number of new records just inserted in the child table that meets a certain criteria. Since the transaction hasn't been committed I can not select the number of records from the child. Does anyone know how to handle this? My manager insists this be done in a trigger.
Thanks, James

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