SQL Server Query matching datasets

Posted on 2012-03-18
Last Modified: 2012-04-11

I am trying to join 2 sets of data unsuccesfully due to the desired output i am after i.e.

each data set has 3 columns of data i can join on i.e.

data set 1                                Data set 2

AAA  111  A1A                       AAA  111  A1A
AAA  111  A1A                       AAA  111  A1A
BBB  222  B2B                       AAA  111  A1A
CCC  333   C3C                       AAA  111  A1A
                                              AAA  111  A1A
                                              BBB  222  B2B    
                                              CCC  333   C3C  

The output I am after is:

AAA   111   A1A    AAA  111  A1A
AAA   111   A1A    AAA  111  A1A
BBB   222    B2B   BBB  222  B2B  
CCC    333    C3C   CCC  333   C3C  

If i try left outer or full outer joins i just end up with duplicates etc. I am not sure if the output i am after is possible (my SQL skills aren't amazing). I did think of trying to add uniqueness to each and row and match on that but not sure how i would automate adding a count to each group of duplicates to do this either.

1 AAA  111  A1A                      1 AAA  111  A1A
2 AAA  111  A1A                      2 AAA  111  A1A
1 BBB  222  B2B                      3 AAA  111  A1A
1 CCC  333   C3C                      4 AAA  111  A1A
                                                5 AAA  111  A1A
                                                1 BBB  222  B2B    
                                                1 CCC  333   C3C  


1 AAA   111   A1A    1 AAA  111  A1A
2 AAA   111   A1A    2 AAA  111  A1A
1 BBB   222    B2B   1 BBB  222  B2B  
1 CCC    333    C3C   1 CCC  333   C3C  

Any help much appreciated, applogies if i have overlooked an easy obvious solution to this.
Question by:ams_group
LVL 38

Accepted Solution

Aaron Tomosky earned 500 total points
ID: 37736173
You can't even delete an individual duplicated row from one of those data sets withou adding a unique id.
I don't think there is a way even of you join all the columns. I dot see how the nulls will happen since there are two rows with those exact values. Rows don't get "used up" when they are matched.

You could possibly make a proc and make temp tables from both datasets, fill a temp table with matched rows deleting from the first two temp tables as you go, then select that out as the result set. Seems really really ugly messy to me.

You could also just group by all colums with a count, then join on all three columns and show the count of matches for each data set. Then you could add a column with the difference and even choose to only show rows.with that difference... Would that work?
LVL 39

Expert Comment

ID: 37736197
how are you generating these datasets? if it is generated using SQL we can try to generate the unique ids using sql and even generate the final joined data in sql. post the existing sql.

Featured Post

What is SQL Server and how does it work?

The purpose of this paper is to provide you background on SQL Server. It’s your self-study guide for learning fundamentals. It includes both the history of SQL and its technical basics. Concepts and definitions will form the solid foundation of your future DBA expertise.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
convert in derived column 7 30 and sql server 4 35
Update a text value in another table 10 39
SQL Server: Unable to remove duplicate sets in Header/Detail 6 23
Everyone has problem when going to load data into Data warehouse (EDW). They all need to confirm that data quality is good but they don't no how to proceed. Microsoft has provided new task within SSIS 2008 called "Data Profiler Task". It solve th…
Why is this different from all of the other step by step guides?  Because I make a living as a DBA and not as a writer and I lived through this experience. Defining the name: When I talk to people they say different names on this subject stuff l…
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…
Using examples as well as descriptions, and references to Books Online, show the different Recovery Models available in SQL Server and explain, as well as show how full, differential and transaction log backups are performed

770 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