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Merge join in SSIS

Posted By:      Posted Date: October 22, 2010    Points: 0   Category :Sql Server
how to use merge join in SSIS?

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Merge Join in SSIS 2005 Vs 2008



I have a process which reads from 2 tables (using two connection managers) and "merge join" them to a third table by using left outer join.

This process is implemented on SSIS 2005 and SSIS 2008 identically, however, for some reason I get less records at the third table at the 2008 process.

When implementing this merge join on Sql Server 2008 and Sql Server 2005 I get the same result as I got at the SSIS 2005 process - so it seems like the problem is at the SSIS 2008 process.
I've checked the merge join properties - they look similar on 2005 and 2008.
Does anyone knows if the 2008 merge join object should be configured differently than the 2005 merge join?
I have nulls on some the fields that connect the two tables - do you think it's got to do with it?
What else can I check?

repeating merge joins using full outer join - should be possible without sort, but cannot get the co

Hello,   I am trying to combine several source tables with Merge Join.  For the Moment I have three source tables all already sorted in the source query and the is sorted property with the correct keys set. (its an aggregate query with group by and sort by the key columns) Then I do a merge join between two of the tables - with a full outer join. Then I just want to do another merge join with the output of the next result. but as the merge join do not combine the key columns into one column I need to add a derived column which substitute null values on the left side of the join with values from the right side of the join. The second merge then says only the left columns of the first merge join is sorted, but not the comined columns. If i Replace with a derived column the left side primary key columsn with the combinded key columns the next merge join says the input is not sorrted? But the output must be sorted. So how do I get the next merge join working without the ssis sort transformation? the data is sorted, but the component does not recognize the sorted data? I do not want to use (can use) the sort because there are flowing >= 500 Mio. records through the pipeline. Any help appreciated.   Hanneshttp://www.hmayer.net/

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I noticed this has been posted before - but could not get it working with the information on that post so here goes:

I have a T-Sql query that INNER JOINs 2 tables on one field - this returns 6,383 records.

(the one table contains 6,383 records and the other table 12 records)

However when I try to implement a data flow task with two data sources (one for each table) and sort the and then try to use the Merge Join transformation to sort and join them on the exact same field the result is 11,073 records.

What is going on here? logically this does not make sense to me ...

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I am doing a Full Outer - Merge Join.

This results in:



but now in some cases the LeftPK may be  null in other cases the RightPK may be null,

so i'm creating a derived column to check:

ISNULL(LeftPK) ? RightPK : LeftPK

and call this the TruePK

this all works however now i'm left with 3 columns

LeftPK; RightPK; TruePK

Is there some kind of transform (other than script task) that i can use to get rid of Left and Right PK columns before sending input to next third party component?

I.W Coetzer

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I'm working with SQL 2008 SSIS.  I'm trying to join two tables on email fields.  For test purposes I have copied some of the email addresses from table A to table B to insue I have matching values.  The OLE DB Source components each use a SQL query that sorts the output by the email addresses in ascending order.   For each of the two source components I've set the IsSorted property to True and set the Output Columns SortKeyPosition property to 1.  Within the SQL query I've also added trim functions to eliminate any possible extra spaces.  Since for testing purposes table B's email addresses are copies of email addresses in table A there is no issue with case.   When linking the two outputs using the Merge Join flow component I do not get any matches.

I've tried sorting using a Sort component rather than within the OLD DB Source query, but it seems to lock up on one of my flows (about 1.5 million records) and won't proceed.

At this point I don't know what else to try. 

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