Integration Services :: Merge Join Transformation - No Output Rows Redux
Aug 4, 2009
I am using SSIS in SQL Server Enterprise 2005. I have two OLE DB data sources from two disparate databases (IBM DB2 and Microsoft SQL Server), some columns from each of which are to be included in the merged output results. I have noted the various requirements in the forum postings with regard to sorting the OLE DB sources and specifying the output source columns as being sorted, as well as the requirement that the join fields in the two sources be close/exact matches. Yet, when I run this in VS, while the work area reflects the expected number of rows being input into the Merge Join transformation, no count is reflected as output from that transformation into the final destination table.Specifically, my two data sources (IBM DB2 and MS SQL) are configured as follows:
IBM DB2 contains an SQL statement that uses Cast operations to create the result columns.and an ORDER BY clause to ensure that the output is sorted by the desired two columns.. The OLE DB source property setting for IsSorted is set to true; the Output Columns folder column definitions for "key_ source_dtsy" and "key_source_dtrt" have their SortKeyPosition properties set to 1 and 2, respectively. Those field are both defined as data type DT_STR, with lengths of 4 and 2, respectively. Below is the Path metadata from the Data Flow Path editor from the path from this source:
IBM DB2 source"Name" "Data Type" "Precision" "Scale" "Length" "Code Page" "Sort Key Position" "Comparison Flags" "Source
Component""ID_CODE" "DT_STR" "0" "0" "10" "1252" "0" "" "Source F0005 User Defined Codes""CODE_DESCR_1" "DT_STR" "0" "0" "30" "1252" "0" "" "Source F0005 User Defined Codes""CODE_DESCR_2" "DT_STR" "0" "0" "30" "1252" "0" "" "Source F0005 User Defined Codes""key_source_dtsy" "DT_STR" "0" "0" "4" "1252" "1" "" "Source F0005 User Defined Codes""key_source_dtrt" "DT_STR" "0" "0" "2" "1252" "2" "" "Source F0005
User Defined Codes:
MS SQL contains an SQL statement that takes the columns as they are in the MS SQL table (no Cast operations needed); it also uses an ORDER BY clause to ensure the output is sorted by the join columns. The OLE DB source property setting for IsSorted is set to true; the Output Columns folder columns for "key_source_dtsy" and "key_source_dtrt" have their SortKeyPosition properties set to 1 and 2, respectively. Those field are both defined as data type DT_STR, with lengths of 4 and 2, respectively. Below is the Path metadata from the Data Flow Path editor from the path from this source:
MS SQL source"Name" "Data Type" "Precision" "Scale" "Length" "Code Page" "Sort Key Position" "Comparison Flags" "Source Component""id_code_name" "DT_I2" "0" "0" "0" "0" "0" "" "Source CodeName in db dwVdFY""key_source_dtsy" "DT_STR" "0" "0" "4" "1252" "1" "" "Source CodeName in db dwVdFY""key_source_dtrt" "DT_STR" "0" "0" "2" "1252" "2" "" "Source CodeName in db dwVdFY"
The Merge Join transformation specifies an INNER JOIN using the columns named "key_source_dtsy" and "key_source_dtrt" from the respective data sources.I know there are alternative ways of accomplishing my intent (Lookup, port MS SQL table to IBM DB2 so join can occur in SELECT statement, etc.; however, I'd like to use this functionality and assume that it should work.
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May 22, 2015
I have two xml source and i need only left restricted data.
how can i perform left restricted join?
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Sep 23, 2015
In the first image as can be seens i have 2 different data sources and then they are being joined using "Merge Inner Join". The "sort" is on BusinessEntityID column of Person table and "Sort1" is on "PersonID" of Customer table. The merge join of these 2 result in 19,119 rows.
On the other hand, if i use single data source and use a query with inner join on tables used in the first image (ie. 2 tables being used in 2 different data sources) as depicted in second image. Also, since merge cannot operate without SortKey i have defined TerritoryID as sort key in the advanced editor. The number of rows i get after this is "10,274". My select query was :
SELECT
P.BusinessEntityID,
P.PersonType,
P.Title,
P.FirstName,
P.MiddleName,
P.LastName,
P.Suffix,
C.TerritoryID
FROM stg.Person AS P
INNER JOIN stg.Customer AS C ON C.CustomerID = P.BusinessEntityID
ORDER BY C.TerritoryID;
According to me, it should have been the same as in first case i am using merge inner join and in second case i am using SELECT query with inner join. Upon drilling down i found that in the first case , my sort keys are BusinessEntityID and PersonID, if i modify this to CustomerID and BusinessEntityID as this is my join condition (in ithe inner join query shown above), i get the desired output. What i was wondering was, how the sort order change the Join Condition?
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Jul 16, 2015
Why Merge Transformation Need to Sorted Inputs?
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Apr 24, 2008
Hi,
I have a problem with a Merge Join providing no output (when it should have 1890 rows). My Data Flow Task has 4 OLE Data Sources, 3 Multicasts, and 1 OLE Data Destination. I am experiencing the problem near the end of my data flow where two Multicasts create two parallel flows of data (see Level 1 below). I have two Merge Joins which join one leg from each multicast with a leg from the other multicast (see Level 2 below). Then the two remaining legs use a Merge to get my destination output (see Level 3 below).
I am experiencing my problem with the Merge Join (input A2, B2) --> (output C2) transformation. The Merge Join providing output C1 appropriately outputs 1890 rows, but C2 outputs 0 rows. Both Merge Joins are identical. The data is identically sorted prior to entering the problematic Merge Join and a DataViewer (Grid) verified that the data is appropriately entering in. Merge Join (input A2, B2) --> (output C2) has 667 rows as input A2 and 1890 rows as input B2 (using an inner join, just like the other merge join), but C2 baffles me with 0 rows of output (when it too should have 1890). I receive no Ouput errors and the execution completes showing all green.
Level 1
Multicast (output A1, A2) [667 rows]
Multicast (ouput B1, B2) [1890 rows]
Level 2
Merge Join (input A1, B1) --> (output C1) [1890 rows]
Merge Join (input A2, B2) --> (output C2) [0 rows]
Level 3
Merge (input C1, C2) --> (output D1) [1890 rows]*
I read about mysterious behavior with Merge Joins and have attempted modifying my EngineThreads property to values between 2 and 10, with no luck. Any help/ideas would be appreciated.
Thanks,
Devin
* Should be 3780 rows
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May 25, 2007
Dear all,
I created a package that seems to work fine with a small amount of data. When I run the package however with more data (as in production) the merge join output is limites to 9963 rows, no matter if I change the number of input rows.
Situation as follows.
The package has 2 OLE DB Sources, in which SQL-statements have been defined in order to retrieve the data.
The flow of source 1 is: retrieving source data -> trimming (non-key) columns -> sorting on the key-columns.
The flow of source 2 is: retrieving source data -> deriving 2 new columns -> aggregating the data to the level of source 1 -> sorting on the key columns.
Then both flows are merged and other steps are performed.
If I test with just a couple of rows it works fine. But when I change the where-clause in the data source retrieval, so that the number of rows is for instance 15000 or 150000 the number of rows after the merge join is 9963.
When I run the package in debug-mode the step is colored green, nevertheless an error is displayed:
Error: 0xC0047022 at Data Flow Task, DTS.Pipeline: SSIS Error Code DTS_E_PROCESSINPUTFAILED. The ProcessInput method on component "Merge Join" (4703) failed with error code 0xC0047020. The identified component returned an error from the ProcessInput method. The error is specific to the component, but the error is fatal and will cause the Data Flow task to stop running. There may be error messages posted before this with more information about the failure.
To be honest, a few more errormessages appear, but they don't seem related to this issue. The package stops running after some 6000 rows have been written to the destination.
Any help will be greatly appreciated.
Kind regards,
Albert.
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May 7, 2015
How do I pass a single column of values from a successful merge join to an EXECUTE SQL statement so it can be used with an "IN" criteria of the WHERE clause? Here's an example of my update statement with two random key values:
UPDATE dbo.MyTable SET MyStatus = 1 WHERE MyPK IN ("XYZ123", "DEF890")
Is this even possible in SSIS, or am I better off using a loop and running the update EXECUTE SQL Statement for each individual key value, as in the following example?
UPDATE dbo.MyTable SET MyStatus = 1 WHERE MyPK = "XYZ123"
UPDATE dbo.MyTable SET MyStatus = 1 WHERE MyPK = "DEF890"
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Dec 25, 2006
While using Aggregate Transformation to group one column,the rows of output sometimes larger than the rows returned by a T-SQL statement via SSMS.
For example,the output of the Aggregate Transformation may be 960216 ,but the
'Select Count(Orderid) From ... Group By ***' T-SQL Statement returns 96018*.
I'm sure the Group By of the Aggregate Transformation is right!
But ,when I set the "keyscale" property of the transformation,the results match!
In my opinion,the "keyscale" property will jsut affects the performance of the transformaiton,but not the result of the transformation.
Thanks for your advice.
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Apr 22, 2015
tell me the difference between Audit transformation and rowcount transformation.
Because audit and rowcount transformation will provide the environment variables.
Only difference i am finding is rowcount returns the count of rows its updating .
Apart from these is there any other difference?
Tell me the scenario where i need to use the audit transformation.
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Apr 17, 2008
Hi,
i have 2 input files,those are sorted on account no field , i use to merge these 2 files data into 1 file.i took merge join trans.... with inner join but i didn't get the output fields ,plz help me regarding this issue.......
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Nov 10, 2006
I have serached through this forum, and I could not find the solution.
My SSIS data flow is a simple one. Extracting two tables from Oracle using OLE DB Source , join them together using merge join and loading into a table in SQL server by SQL Server Destination.
I haven't gone through this simple procedure because Merge join always hangs there. Down to further investigation, I found one input (randomly one of two inputs) is always stuck. Sometimes the input is empty, sometimes is about half way.
Is there workround to see what is happening there and to fix this problem?
TIA
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Aug 10, 2006
Hi,
I am pretty new to SSIS. I am transferring some rows from 2 source tables to 1 destination table.
The 2 source tables have 1000 rows.They act as the 2 inputs to a merge join transformation where i perform the join between the 2 tables based on a couple of fields. But for some reason the output of the merge join gives me about 1018 rows .Shouldnt the destination also have only 1000 rows?
How do i solve tis problem?
Thanks in advance
Sat
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Nov 7, 2006
I've run into something that looks like a bug to me but I wanted to run it by the board:
Merge join 2 sorted tables.
Table1: ColumnA : Sort Order 1, ColumnB Sort Order 2
Table2 : ColumnA: Sort Order 1, ColumnB Sort Order 2, ColumnC not sorted
Merge Join the two tables on ColumnA and ColumnB...
Choose the following as output columns
A + B + C = works
C = works
A + C = works
B + C = NOT work.. error message: The column with the SortKeyPosition value of 0 is not valid. It should be 2.
Basically if you choose one or more of the sorted columns in the output at least one of them has to be the column with Sort position 1 or you'll get that error.
Is this a bug or intentional? If you do not have sort column 1 in the output that output could no longer be considered sorted... so perhaps the error is related to that (instead of error I'd expect some warning about the sorting). Interesting that it lets you choose C only becuase that also makes the output unsorted.
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Apr 14, 2008
I have a sql statement that joins two tables and I get back a few thousand records when I run it in query tool in management studio.
But when I use SSIS merge join to join the two tables my output is 0 records.
I did sort the key column in both tables by setting 'sortkeyposition' property to 1 in advanced editor for output of both tables.
however the merge join returns nothing to my destination tables. Also I am doing a inner join. The task runs without error but returns nothing as well.. any ideas?
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Nov 3, 2007
I'm doing a data conversion with one of my fields (SUMDWK) from one of the tables that will be used in a merge join. With the new, converted field, I do a look up. From this look up, I want to take a new field FiscalWeekOfYear, and replace the original field, SUMDWK. This is necessary because SUMDWK is one of the sorted fields. In the look up, it is not possible to change the Output Alias. Does anybody know a way around this? Thanks.
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May 21, 2015
How to summarise the data in this table to a single row output per site (2 records for every SiteID). I am based in the UK so the data copied from SQL is in the US format. I can convert this to UK date without any issues.
CREATE
TABLE [dbo].[MRMReadings](
[SiteIncomeID] [int] IDENTITY(1,1)
NOT NULL,
[SiteID] [nchar](5)
NOT NULL,
[Code] ....
Is it possible to return the data in the following format merging 2 lines of data into one output:
SiteID ReadStartDate ReadEndDate ReadStartIncome ReadEndIncome
L0020 19/05/2015 05:00 20/05/2015 05:00 85.98 145.98
L0101 19/05/2015 22:07 20/05/2015 22:14 1,936.08 1,438.89
L0102 20/05/2015 21:16 19/05/2015 21:48 143.65 243.5
I am using SQL 2008 R2.
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Jul 14, 2015
I am working on a SSIS Package and I have to do a data transformation but this one is a but tricky. For example
7/6/2015 is my date and when I apply
SUBSTRING(ColumnName,5,4) + "-" + SUBSTRING(ColumnName,3,1) + "-" + SUBSTRING(ColumnName, 1,1)
I get 2015-6-7 which is good
But then when the date is like 10/12/2015 I would have to modify my code
My question is, Is their anything I can add to the code to make the single digits have a zero before them so I can use the same code throughout. My updated code would then be
SUBSTRING(ColumnName,7,4) + "-" + SUBSTRING(ColumnName,4,2) + "-" + SUBSTRING(ColumnName, 2,1)
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Aug 27, 2015
i want to use lookup transformation using Excel as a source.i am having two excel files .
file1 one of the column contains 'Andhrapradesh'
file2 one of the column contains 'ap'
here want to match these using lookup.
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Nov 3, 2015
In my package I am using lookup to get new and similar record. I want to filter the rows for Lookup Reference Data Set by using Variable Value.
I have created variable @[User::CustId] with Int32 datatype, having default value 2 when I am trying to evaluate below query I am getting error
"select CustId,PartNm,LocId,LocTyp from loc where CustId= "+ @[User::CustId]
Error. The Data types "DT_WSTR" and "DT_I4" are incompatible for binary operator "+".
The operand types could not be implicitly cast into compatible types for the operation. To perform this operation , one or both operands need to be explicitly cast with the operator.
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Dec 20, 2007
I need to transform Foxpro table to SQL Server table with merging all rows into one where all column values are the same except one . For this the only column with the different values , I want them also to be merged as coma or space delimited string. The question whether SSIS is a good candidate for this kind of data munging and also would be interested to know knowing as many as possible ways of doing that. Surely I may produce Foxpro script in 5 minutes which wil do that and be a pre-processor action before SSIS starts.
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Jun 4, 2015
We are using the cache transformation in our project , while doing the cache transformation our disk space goes to 0 MB free and SSIS package execution not completes even after 3 hr..Initially we have around 34 GB free space on C: drive .Our server configuration is 64 RAM. We are caching the data from table which contains around 21 million records.We changed the path in properties (“BLOPTempStoragePath”,”BufferTempStoragePath”) of Data Flow task of SSIS in which we are using Cache Transformation.
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Jun 4, 2015
I have the following 2 fields that are sourced from an Excel spreadsheet
DocNumber - a 10 digit number
PostingRow - a number between 1 and 999
I would like to produce a new column that is a concatenation of these two fields, but the PostingRow needs to be a 3 digit number eg. 1000256153-001 ....
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Apr 14, 2015
In SSIS I use the DQS Cleansing transformation component. I've got a knowledge base (KB) in place and this KB holds various domains and my data source has more input columns than would like to use for a particular clean up operation. I want to use some of the input columns to map against some domains in the KB. It is my understanding that it should be possible to select only the required input columns, but all i can do is select all input columns.
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Aug 14, 2015
Is it possible to parameter the connection of a Lookup Transformation task - specifically the table/view name? I would like to be able to dynamically set the table that the Lookup Transformation is connecting to at runtime.I've looked into the "Use results of an SQL query" on the connection screen (which correlates to the "SqlCommand" property), but I'm unable to pass in a parameter this way.I've also looked into the SqlCommandParam, but that doesn't allow me to use a parameter in the "FROM" clause of the sql syntax.
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Aug 17, 2015
From SQL Server 2014, using SQL Server Data Tools for Visual Studio - BI, I'm trying to edit a Script Component within an SSIS Data Flow Task. The 'Edit Script...' button is enabled and turns a nice shade of blue when moused over, but a click has no effect. Perhaps I'm missing a component of VSTA? Everything else seems to work correctly. What might I be missing?
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Feb 5, 2007
I've gote 2 Tables with about 50.000 rows and I left outer join them with MERGE JOIN.
The result are 9999 rows. Has anybody got the same problem. Maybe it's a bug!?
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Aug 24, 2015
I am importing the values for field Atype from a .csv file as DT_STR, 13 and I need to fit them into a bit type CType field.
When I write the conditional split ((ISNULL(Atype)?"a":Atype)!=(ISNULL(CType)?"9":CType)) it says that the DT_WSTR and DT_I4 types are incompatible and that I need to explicitly cast with a cast operator. I haven't been able to make it work, how to explicitly cast?
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Aug 6, 2006
Does anyone know how i can go about merging preexisting pdf files and SQL server reporting services output. Can this be done in reporting services? For example, I have 5 pages from a pdf files which is created from another 3rd party software provider. I then i have output from sql reporting services. How can i merge these two outputs and deliver it over .Net/ ASP framework?
thanks
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Sep 11, 2015
I have a conditional split in an SSIS package - one split is where if rows are returned according to a specific rule, then insert those rows into to a Recordset Destinationm which points to a variable of Object type.
How I can use this variable to email fellow users. For example, what I would like is if ANY rows are returned to the Object variable (1 or more), then I would like to execute an email SP that we have on our server.
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Jul 1, 2015
My source has 2.2 million of records. I'm performing the incremental load.In the lookup transformation i used the destination table for the reference using Full cache mode.For the first time package executed successfully but when i executed the package second time, Suddenly Package hangs while running.Than i truncate the data from the destination table and restart the SQL Server Services.After doing all this i executed package again and it worked but when i executed package second time, again package hangs up .I have 8GB RAM and i5 2.5 GHz Processor laptop.
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Oct 13, 2015
I am facing an issue that Data flow task failing after loading 29000 rows out of 2lakhs rows.
I am loading data from .csv file to OLE DB Destination.
This data flow task is placed inside For each loop container.
is this issue because of any performance issue in SSIS packages such as buffer size.
find the error below:
DFT Load Data from FlatFile:Error: The conditional operation failed.
DFT Load Data from FlatFile:Error: SSIS Error Code DTS_E_INDUCEDTRANSFORMFAILUREONERROR.
The "DER Add Calc Columns" failed because error code 0xC0049063 occurred, and the error row disposition on "DER Add Calc Columns.Outputs[Derived Column Output].Columns[M_VALUE_NUM]" specifies failure on error. An error occurred on the specified object of the specified component. There may be error messages posted before this with more information about the failure.
DFT Load Data from FlatFile:Error: SSIS Error Code DTS_E_PROCESSINPUTFAILED. The ProcessInput method on component "DER Add Calc Columns" (48) failed with error code 0xC0209029 while processing input "Derived Column Input" (49). The identified component returned an error from the ProcessInput method. The error is specific to the component, but the error is fatal and will cause the Data Flow task to stop running. There may be error messages posted before this with more information about the failure.
[code]....
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May 11, 2015
We've two OLE DB sources under DFT. TableA from one OLE DB source brings ID's as ( 1, 3, 5 ) and TableB from another OLE DB source brings ID's as ( 0, 3, 6 ). Now would I be able to use merge component to get all non-matching ID's from both tables A & B and store in the OLE DB destination as ( 0, 1, 5, 6 ) [ 1 & 5 from TabelA and 0 & 6 from TableB ]If no, what other option I've to make this req. doable?
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Nov 23, 2015
I have a source table #source with columns 'source', 'patientcode' ,'patientdesc' and it has 4 records as below
source patientcode patientdesc
canada abc patient1
canada efg patient2
canada hij patient3
canada klm patient4
I have a target table and it has 2 records as below.
source prefix tgt_patientcode tgt_patientdesc
canada cn abc patient1
canada cn efg patient2
Now, I want to merge the source data with target table -that means, if the records are already avaible in target, then ignore and if it does not available then INSERT.
This is the query i used but new records are not getting inserted.
MERGE #target T
USING #source S
ON S.SOURCE=T.Source
WHEN NOT MATCHED BY TARGET THEN
INSERT ( Source, Prefix ,tgt_patientcode ,tgt_patientdesc)
VALUES ('Canada' , 'cn' , s.patientcode, s.patientcode);
I want the output as below
source prefix tgt_patientcode tgt_patientdesc
canada cn abc patient1
canada cn efg patient2
canada cn hij patient3
canada cn klm patient4
DDL as below :
create table #target (source varchar(100),prefix varchar(2),tgt_patientcode varchar(100),tgt_patientdesc varchar(100))
insert into #target values ('canada','cn','abc','patient1')
insert into #target values ('canada','cn','efg','patient2')
[Code] ....
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