Solved

Limiting rows returned from count of records in a subquery.

Posted on 2014-03-26
3
150 Views
Last Modified: 2014-03-30
Hi Team,

I am trying to nut out a query which returns the COUNT of rows in a history table where a resultcode is 'NOT' and that COUNT is more than 2.

I have been sweeping the Net to find a clue, alas without luck.

EG

Select KEY1,Company, (select COUNT(resultcode) from C1)
from CONTACT1
inner join CONTACT2 on Contact1.ACCOUNTNO = CONTACT2.ACCOUNTNO
where Exists (select key1,COUNT(RESULTCODE)
from CONTACT1 c1
inner join CONTACT2 c2 on C1.ACCOUNTNO = C2.ACCOUNTNO
left join CONTHIST CH on CH.ACCOUNTNO = C1.ACCOUNTNO
where
CH.RESULTCODE = 'SHD'
GROUP BY C1.KEY1)

I get this error   "Invalid object name 'C1'"

All help is achknowledged.
Cheers
Bernard
0
Comment
Question by:BernardGBailey
3 Comments
 
LVL 2

Accepted Solution

by:
GowthamNatarajan earned 500 total points
ID: 39958190
select T.KEY1,T.Company,T.CountFromHistory from (Select CONTACT1.KEY1,CONTACT1.Company, (select COUNT(CH.ResultCode) from CONTHIST CH where CH.Acctno = CONTACT1.AcctNo and CH.resultCode = 'SHD')  AS CountFromHistory
from CONTACT1
inner join CONTACT2 on CONTACT1.ACCOUNTNO  = CONTACT1.ACCOUNTNO) T where T.CountFromHistory > 2
0
 
LVL 65

Expert Comment

by:Jim Horn
ID: 39958804
>and that COUNT is more than 2.
To filter on an aggreate you need a HAVING clause, not a WHERE clause.

Select KEY1,Company, (select COUNT(resultcode) from C1)
from CONTACT1 
	inner join CONTACT2 on Contact1.ACCOUNTNO = CONTACT2.ACCOUNTNO
where Exists (
	select key1,COUNT(RESULTCODE)
	from CONTACT1 c1
		inner join CONTACT2 c2 on C1.ACCOUNTNO = C2.ACCOUNTNO
		left join CONTHIST CH on CH.ACCOUNTNO = C1.ACCOUNTNO
		where CH.RESULTCODE = 'SHD'
		GROUP BY C1.KEY1
		HAVING count(resultcode) > 2)   -- < --  Something like this

Open in new window

There's an article out there on SQL Server GROUP BY Solutions; scroll down to #3 'Filter rows by a condition on an aggregate value:  HAVING'.
0
 

Author Closing Comment

by:BernardGBailey
ID: 39965251
GowthamNatarajan,

I was able to get this query going from your code after making a change.  See under

select T.KEY1,T.Company,T.NOTCnt
from (Select CONTACT1.KEY1,CONTACT1.Company,
(select COUNT(CH.ResultCode) from CONTHIST CH
left join CONTACT2 c2 on c2.ACCOUNTNO = CH.ACCOUNTNO
where CH.Accountno = CONTACT1.AccountNo and CH.resultCode = 'NOT'
and CH.ONDATE > ULASTSALE
and contact1.key5 ='GREEN'
) AS NOTCnt
from CONTACT1
inner join CONTACT2 on CONTACT2.ACCOUNTNO  = CONTACT1.ACCOUNTNO) T where T.NOTCnt > 2

 Many thanks


Jim, Sorry I had no luck making your solution work.
0

Featured Post

Microsoft Certification Exam 74-409

Veeam® is happy to provide the Microsoft community with a study guide prepared by MVP and MCT, Orin Thomas. This guide will take you through each of the exam objectives, helping you to prepare for and pass the examination.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Nowadays, some of developer are too much worried about data. Who is using data, who is updating it etc. etc. Because, data is more costlier in term of money and information. So security of data is focusing concern in days. Lets' understand the Au…
Slowly Changing Dimension Transformation component in data task flow is very useful for us to manage and control how data changes in SSIS.
Via a live example, show how to backup a database, simulate a failure backup the tail of the database transaction log and perform the restore.
Via a live example, show how to setup several different housekeeping processes for a SQL Server.

910 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

22 Experts available now in Live!

Get 1:1 Help Now