Solved

Access/SQL Comparing records against Composite Primary Key

Posted on 2016-09-19
8
69 Views
Last Modified: 2016-09-25
I have a table in SQL Server with a number of fields, i have created a composite PK of LoanNumber, BorrowerName, LenderNumber; I need to compare a new data set that contains these and other fields to determine if there are any new PK on the new data set, which will then be added to the original table.

Thank you!



Keyword Tags:
VBA, SQL, SQL Server, Access, VB
0
Comment
Question by:Charlesdavid Allen
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
8 Comments
 
LVL 51

Expert Comment

by:Ryan Chong
ID: 41804524
>>I need to compare a new data set that contains these and other fields to determine if there are any new PK on the new data set, which will then be added to the original table.

first, where you want to compare these records? in Ms SQL Server,Access, etc? reason being there are different approaches we can do this.
0
 
LVL 28

Expert Comment

by:Pawan Kumar
ID: 41804617
Then you can use LEFT JOIN with the two table to get the new records.


Which DB you are referring ? SQL Server ?
0
 
LVL 1

Author Comment

by:Charlesdavid Allen
ID: 41804676
comparing access table (comma delimited, imported, error checked and formated) in code. has same field names but no PK as the SQL Server table (ODBC Linked).
0
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.

 
LVL 36

Expert Comment

by:PatHartman
ID: 41805125
Although joining the Access table to the SQL Server table is possible, it is inefficient since Access will send a request to download the ENTIRE SQL Server table and perform the join locally.  If the SQL Server table isn't large, then it won't be a problem but once you get to more than 100,000, you probably want to do something different.  Uploading the Access data to a temp table in SQL Server might prove to be more efficient if the Access table is very small and the server side table is very large.  Then you can do the left join in SQL Server.

The left join will return the "new" records.
0
 
LVL 1

Author Comment

by:Charlesdavid Allen
ID: 41805309
left join on each field = corresponding field?
0
 
LVL 1

Author Comment

by:Charlesdavid Allen
ID: 41805321
Pat that is to say,

Loaded the access able to a temp table in SQL called tempNewLoandata

SELECT *
FROM tempNewLoanData
LEFT JOIN MasterLoanData
ON tempNewLoanData.LoanNumber = MasterLoanData.LoanNumber AND   tempNewLoanData.BorrowerName = MasterLoanData.BorrowerName AND tempNewLoanData.LenderNumber = MasterLoanData.LenderNumber

?
0
 
LVL 36

Accepted Solution

by:
PatHartman earned 500 total points
ID: 41805335
SELECT *
FROM tempNewLoanData
LEFT JOIN MasterLoanData
ON tempNewLoanData.LoanNumber = MasterLoanData.LoanNumber AND   tempNewLoanData.BorrowerName = MasterLoanData.BorrowerName AND tempNewLoanData.LenderNumber = MasterLoanData.LenderNumber

WHERE MasterLoanData.UniqueID Is Null;

You need a where clause.  If you don't have an autonumber PK, then just use one of the join fields instead.
1
 
LVL 1

Author Closing Comment

by:Charlesdavid Allen
ID: 41815040
Thanks for the hand as always Pat.  Worked well; My brain was not firing on all cylinders that morning.
0

Featured Post

Edgartown IT Case Study

Learn about Edgartown's quest to ensure the safety and security of the entire town's employee and citizen data. Read the case study!

Question has a verified solution.

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

When table data gets too large to manage or queries take too long to execute the solution is often to buy bigger hardware or assign more CPUs and memory resources to the machine to solve the problem. However, the best, cheapest and most effective so…
When it comes to protecting Oracle Database servers and systems, there are a ton of myths out there. Here are the most common.
In Microsoft Access, learn how to “cascade” or have the displayed data of one combo control depend upon what’s entered in another. Base the dependent combo on a query for its row source: Add a reference to the first combo on the form as criteria i…
In Microsoft Access, learn how to use Dlookup and other domain aggregate functions and one method of specifying a string value within a string. Specify the first argument, which is the expression to be returned: Specify the second argument, which …

733 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