Cant get a Count( * ) on INNER JOIN using OPENQUERY

Posted on 2004-10-07
Last Modified: 2008-01-09
I need to get the count(*) of an inner join statement using OPENQUERY using 2 linked queries.   Is this possible?  If so how?

Here is what I have, and keep coming up with an error.

OpenQuery(AS400, 'SELECT SUBNO, PERNO, cgrpid FROM hmodta.hmembp') as a INNER JOIN
OpenQuery(WEBSRVR2, 'SELECT Count(*), External_System_Key, User_ID FROM mcnet..user_header')  AS p ON a.SUBNO + a.PERNO = p.External_System_Key  
WHERE a.cgrpid = 'M00005'
Question by:vikingg97
LVL 26

Accepted Solution

Hilaire earned 300 total points
ID: 12249640
>>'SELECT Count(*), External_System_Key, User_ID FROM mcnet..user_header'<<
This is not a parsable SQL statement
When selecting count(*) along with other columns, you need a group by clause

SELECT Count(*), External_System_Key, User_ID FROM mcnet..user_header
group by External_System_Key, User_ID
LVL 17

Assisted Solution

BillAn1 earned 200 total points
ID: 12249965
also, you would be better off putting the WHERE clause inside the OPENQUERY -
as is, the AS400 database is going to return the whole table to SQLServer, which will then join these rows with the resolts from WEBSRVR2, and filter for a particular value of cgrpid. You will almost suredly get better performance if you have the AS400 db return only the records you want, (it may have an index on this column, and at the very minimum, it will reduce network traffic)

OpenQuery(AS400, 'SELECT SUBNO, PERNO, cgrpid FROM hmodta.hmembp WHERE cgrpid = ''M00005''') as a INNER JOIN
OpenQuery(WEBSRVR2, 'SELECT Count(*), External_System_Key, User_ID FROM mcnet..user_header GROUP BY External_System_Key, User_ID')  AS p ON a.SUBNO + a.PERNO = p.External_System_Key  

Author Comment

ID: 12250351
That is awesome Billan1.  It worked so much faster including that inside.  Thanks also Hilaire for initial answer.  I split the points giving more to Hillare since she originally answered it.  Billan1 though moved the query time from 20-30 sec to less than a second.

I am going to post another question related to this about how to include this into Classic ASP to return the record set, so if you guys know feel free to answer.  

Thanks again!


Featured Post

VMware Disaster Recovery and Data Protection

In this expert guide, you’ll learn about the components of a Modern Data Center. You will use cases for the value-added capabilities of Veeam®, including combining backup and replication for VMware disaster recovery and using replication for data center migration.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
email the result out from a T-SQL queries 29 64
SQL Server - Slabs 9 38
Serach for record in Microsoft SQL Management Studio 8 20
MSDN Licensing query 5 55
Having an SQL database can be a big investment for a small company. Hardware, setup and of course, the price of software all add up to a big bill that some companies may not be able to absorb.  Luckily, there is a free version SQL Express, but does …
JSON is being used more and more, besides XML, and you surely wanted to parse the data out into SQL instead of doing it in some Javascript. The below function in SQL Server can do the job for you, returning a quick table with the parsed data.
Familiarize people with the process of retrieving data from SQL Server using an Access pass-thru query. Microsoft Access is a very powerful client/server development tool. One of the ways that you can retrieve data from a SQL Server is by using a pa…
Viewers will learn how to use the INSERT statement to insert data into their tables. It will also introduce the NULL statement, to show them what happens when no value is giving for any given column.

867 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

13 Experts available now in Live!

Get 1:1 Help Now