Merge Join - Output Of Lookup As Sorted Field?
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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Oct 20, 2006
Very often we have 50'000+ rows which you need to pull values from different source (e.g. CityNames from citycode in Excel file). Currently we are using Lookup - but the questions is which of those 3 options is best in performance wise?
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Feb 7, 2006
I had this (what seems to be a) simple question asked today and I'm afraid I didn't like my answer. Does anyone know the proper answer to this one:
Any ideas on how I can constrain a lookup or merge join based on the dimension row's effective and expired dates so three criteria are needed as follows:
1. DataStagingSource.ModifyDate < DataWarehouseDimension.RowExpiredDate AND
2. DataStagingSource.ModifyDate >= DataWarehouseDimension.RowEffectiveDate AND
3. DataStagingSource.NaturalKey = DataWarehouseDimension.NaturalKey
-- Brian
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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 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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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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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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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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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"Â "Data Type"Â "Precision"Â "Scale"Â "Length"Â "Code Page"Â "Sort Key Position"Â "Comparison Flags"Â "Source
Component""ID_CODE"Â "DT_STR"Â "0"Â "0"Â "10"Â "1252"Â "0"Â ""Â "Source F0005 User Defined Codes""CODE_DESCR_1"Â "DT_STR"Â "0"Â "0"Â "30"Â "1252"Â "0"Â ""Â "Source F0005 User Defined Codes""CODE_DESCR_2"Â "DT_STR"Â "0"Â "0"Â "30"Â "1252"Â "0"Â ""Â "Source F0005 User Defined Codes""key_source_dtsy"Â "DT_STR"Â "0"Â "0"Â "4"Â "1252"Â "1"Â ""Â "Source F0005 User Defined Codes""key_source_dtrt"Â "DT_STR"Â "0"Â "0"Â "2"Â "1252"Â "2"Â ""Â "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"Â "Data Type"Â "Precision"Â "Scale"Â "Length"Â "Code Page"Â "Sort Key Position"Â "Comparison Flags"Â "Source Component""id_code_name"Â "DT_I2"Â "0"Â "0"Â "0"Â "0"Â "0"Â ""Â "Source CodeName in db dwVdFY""key_source_dtsy"Â "DT_STR"Â "0"Â "0"Â "4"Â "1252"Â "1"Â ""Â "Source CodeName in db dwVdFY""key_source_dtrt"Â "DT_STR"Â "0"Â "0"Â "2"Â "1252"Â "2"Â ""Â "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.Â
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Jun 4, 2007
Hello all,
I am trying to think my way through a solution which I believe others have probably come across... I am trying to implement a matching routine wherein I need to match an address against a high value and a low value (or, for that matter an input date vs. a start and end date) to return the desired row ... i.e. if I were to use a straight vb program I would just use the following lookup:
"SELECT DISTINCT fire_id, police_ID, fire_opt_in_out, police_opt_in_out FROM ipt_tbl " & _
" WHERE zip_code = @zip_code AND addr_prim_lo <= @street_number AND addr_prim_hi >= @street_number " & _
" AND addr_prim_oe = @addr_prim_oe AND street_pre = @street_pre AND street_name = @street_name " & _
" AND street_suff = @street_suff AND street_post = @street_post " & _
" AND (expiry_date = '' OR expiry_date = '00000000' OR expiry_date > @expiry_date)" & _
" GROUP BY fire_ID, police_ID, fire_opt_in_out, police_opt_in_out"
My question, then, is how would you perform this type of query using a lookup / merge join or script? I have not found a way to implement a way to set the input columns? I can set the straight matches without a problem, i.e. lookup zip code = input zip code, but can't think of the correct way to set comparisons, i.e. lookup value 1 <= input value AND lookup value 2 >= input value
Any suggestions?
thanks for your time...
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Jul 16, 2015
Why Merge Transformation Need to Sorted Inputs?
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Nov 19, 2013
Is there a way to join tables that have multiple matches to each other (2 records in one table and 2 in another) so that you get 2 records returned instead of 4 with only 1 JOIN ON qualifier?
In our warehouse DB, there is a master location table, an inventory location table, and physical table for counting all product in the warehouse. The master location table has one record per location, but there could be multiple items in that location so my outer join from the master location to the inventory table returns something like:
select M.MASTER_LOC, C.AS ORIG_ITEM, C.ORIG_LOT, C.ORIG_QTY
from
M_LOC M LEFT OUTER JOIN
C_INVT C ON M.MASTER_LOC = C.INVT_LOC
order by M.LOC_CODE
LOCATION ITEM LOT QTY
01-01-A 100 abc 25
01-02-A NULL NULL NULL
01-03-A 200 def 50
01-03-A 200 ghi 50
My problem is adding the third counted inventory table because it could look like anything depending on what we find in the racks:
LOCATION ITEM LOT QTY
01-01-A 100 abc 25 (exact match)
01-02-A 150 cba 75 (Item found)
01-03-A 200 ghi 50 (LOT swapped)
01-03-A 300 def 50 (Item Changed)
My join is returning 4 rows for location 01-03-A which I understand, but I'm wondering if I can sort within the join or make some temp tables so that instead of:
select M.MASTER_LOC, C.AS ORIG_ITEM, C.ORIG_LOT, C.ORIG_QTY, E.AS CNTD_ITEM, E.CNTD_LOT, E.CNTD_QTY
from
M_LOC M LEFT OUTER JOIN
C_INVT C ON M.MASTER_LOC = C.INVT_LOC LEFT OUTER JOIN
E_PHYS_INVT E ON M.MASTER_LOC = E.LOC_CODE
order by M.LOC_CODE
LOC1 ITEM LOT QTY LOC2 ITEM LOT QTY
01-03-A 200 def 50 01-03-A 200 ghi 50
01-03-A 200 def 5001-03-A 300 def 50
01-03-A 200 ghi 5001-03-A 200 ghi 50
01-03-A 200 ghi 5001-03-A 300 def 50
I'd like to just end up with 2 lines sorted by location, item, lot, qty so I can see that there is a problem with that location.
LOC1 ITEM LOT QTY LOC2 ITEM LOT QTY
01-03-A 200 def 5001-03-A 200 ghi 50
01-03-A 200 ghi 5001-03-A 300 def 50
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Aug 27, 2014
So if an item is a bottle, it will have a unique BottleKey and Null for CaseKey and if an item is a Case, it will have a unique CaseKey and Null for BottleKey. However, the PrimaryIDs are the same for both the bottle and case. I get the results to look like this:
Bottlekey CaseKey PrimaryID
4754 NULL ABC-234
NULL 5465 ABC-234
.... .... .......
Is there a way to get the result sorted by Primary ID?
So that the rows are halved from what we have in the table above and the results look like
PrimaryID CaseKey BottleKey
ABC-234 5465 4754
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Feb 21, 2008
I am using the following useful article regarding exporting a multi-record file:
http://vsteamsystemcentral.com/cs21/blogs/steve_fibich/archive/2007/09/25/multi-record-formated-flat-file-with-ssis.aspx
I have created the 2 datasources, ordering each on a field commmon to both.
I have created the two derived columns headers and am now moving on to the merge.
It is failing with the following error:
"the input is not sorted"
And whilst I definitely have an order by on the query, when I look at the metadata between the datasource and the derived column, the Sort Key Position items displays "0" for all my fields, I was expecting the sort field to have a "1" in this column. What am I missing?
Any help would be most appreciated!
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Sep 23, 2015
Say I want to lookup a value in another dataset, but there is a grouping that requires you to know what the values for each level is in order to get to the correct detail record.  Can you still use the lookup function with more than one field to compare against? So for example
Department
\___SalesPerson
    \___Measure
I want to be able to add a new row at the Measure level, but lookup each field from another dataset. In order to do that I will need the Department AND SalesPerson values to do the lookup, but I dont think the Lookup function will let us do that will.
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Oct 8, 2015
The following works just fine. The table tmpMHPCLMDET does have a column ADMTDT ( varchar(8) ).
While I am adding the sequence of numbers I like it to be sorted based on ADMTDT column.
What that means is the row with the earliest ( smallest ) ADMTDT will get 1 and the next 2 and so on.
Declare @ID int
If Exists ( Select c.name from sys.columns c where object_id = object_id('tmpMHPCLMDET') and C.name = 'ServiceLineID' )
Begin
--Adding a sequence of numbers to the ServiceLineID column.
SET @id = 0
UPDATE tmpMHPCLMDET
SET @id = ServiceLineID = @id + 1;
End;
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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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Aug 10, 2007
Scenario:
OLEDB source 1
SELECT ...
,[MANUAL DCD ID] <-- this column set to sort order = 1
...
FROM [dbo].[XLSDCI] ORDER BY [MANUAL DCD ID] ASC
OLEDB source 2
SELECT ...
,[Bo Tkt Num] <-- this column set to sort order = 1
...
FROM ....[dbo].[FFFenics] ORDER BY [Bo Tkt Num] ASC
These two tasks are followed immediately by a MERGE JOIN
All columns in source1 are ticked, all column in source2 are ticked, join key is shown above.
join type is left outer join (source 1 -> source 2)
result of source1 (..dcd column)
...
4-400-8000119
4-400-8000120
4-400-8000121
4-400-8000122 <--row not joining
4-400-8000123
4-400-8000124
...
result of source2 (..tkt num column)
...
4-400-1000118
4-400-1000119
4-400-1000120
4-400-1000121
4-400-1000122 <--row not joining
4-400-1000123
4-400-1000124
4-400-1000125
...
All other rows are joining as expected.
Why is it failing for this one row?
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Apr 20, 2008
what is the diff between lookup and merge transformation.
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Jun 5, 2006
I have a merge join (full outer join) task in a data flow. The left input comes from a flat file source and then a script transformation which does some custom grouping. The right input comes from an oledb source. The script transformation output is asynchronous (SynchronousInputID=0). The left input has many more rows (200,000+) than the right input (2,500). I run it from VS 2005 by right-click/execute on the data flow task. The merge join remains yellow and the task never finishes. I do see a row count above the flat file destination that reaches a certain number and seems to get stuck there. When I test with a smaller file on the left it works OK. Any suggestions?
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May 25, 2006
I am not sure If I can do this with a lookup, but what I would like todo is perhaps use lookup to retrieve a control date from anunassociated table to control what date is entered in another table.For example :the main table , table 1 has many entries with a field called date_enter which is the date the record was entered.table 2 has a control_dateIf the date entered in table 1 is less than or = to the control date wewant to give the user a error message.I am thinking of using display only field and lookup to set itWould need to have the date value from the control table available tothe active table of table 1 when entering the the date_enter.However as there is no join field between the two tables am not surehow to do it. Was thinking might have to add a key field that wasallways null and in the BEFORE EDITADD EDITUPDATE section set it sothat the key would be nullAm using Informix 5 , Any help would be apprecia
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Nov 7, 2006
Is there a way to do a super-table join ie two table join with no matching criteria? I am pulling in a sheet from XL and joining to a table in SQLServer. The join should read something like €œfor every row in the sheet I need that row and a code from a table. 100 rows in the sheet merged with 10 codes from the table = 1000 result rows.
This is the simple sql (no join on the tables):
select 1.code, 2.rowdetail
from tblcodes 1, tblelements 2
But how to do this in SSIS?
Thanks - Ken
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May 6, 2008
I read that merge joins work a lot faster than hash joins. How would you convert a hash join into a merge join? (Referring to output on Execution Plan diagrams.)
THANKS
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Jul 22, 2007
Hello all.....
I got a doubt whether we can use Lookup as an inner join.
If I have duplicate keys in lookup source....can I get the duplicate rows also into the destination.
Ex:
source:
c1 c2 c3
--- --- ---
1 a1 b1
2 a2 b2
3 a3 b3
lookup table:
c1 c4 c5
--- --- ---
1 c1 d1
2 c21 c22
2 c23 c24
3 c3 c3
noe the result should be:
c1 c2 c3 c4 c5
-- -- -- -- --
1 a1 b1 c1 d1
2 a2 b2 c21 c22
2 a2 b2 c23 c24
3 a3 b3 c3 c3
in msdn I read the look up will get the first match.....is it possible to get all matches??
Thank you
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Jul 20, 2005
Folks,My secnario involves two tables - ObservationRegister, and Person.ObservationRegister contains most of the "useful" fields, includingthe UserID of the person that raised the record, and the UserID of theperson to whom the record was assigned for action. I need to write aquery to return all values in the ObservationRegister record, butinstead of returning the UserIDs, I need to look up the actual name,by looking up the name and userID in the Person table... doing thatonce (for just one of the UserID fields) is easy - a quick inner joindoes the job - but I effectively need to join to the Person table"twice", for different keys....Help? Please!? :)Steve
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Sep 1, 2006
Does anyone have a clue as to why DT_R4, DT_R8 are not allowed as join columns? This means I cannot join tables on AccountNumbers, InvoiceNumbers, etc. What a pain...
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Nov 2, 2015
We have two queries that run nightly and we'd like to combine them and only have one result set instead of two. What's the best way to combine these? The only difference is the Table the information is being pulled from.
Query 1:
set nocount on
select
case
when datalength(MICRACCTNUMBER) = 4 then convert(char(20),('001 000000000000'+MICRACCTNUMBER))
when datalength(MICRACCTNUMBER) = 5 then convert(char(20),('001 00000000000'+MICRACCTNUMBER))
when datalength(MICRACCTNUMBER) = 6 then convert(char(20),('001 0000000000'+MICRACCTNUMBER))
[code].....
Again, the only difference is the Table the info is coming from...
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Sep 14, 2015
I used the MERGE function for the first time. Now I have to create a pipe-delimited delta file for a 3rd party client of any deltas that may exist in our database.
What is the best way to do this? I have OUTPUT to a result set of the deltas...but I have to send over the entire table to the 3rd party via a pipe-delimited file.
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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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Mar 14, 2008
Hi
I have read a few other posts about how to merge multiple report output files into a single document e.g. a single pdf.
There are a few approaches:
1) Generate post script files and then merge and oprint via a post script driver.
2) Generate seperate pdf files and then merge them into single document using a custom library.
I have a third idea and would appreciate any input:
Dynamically generate a RDL file that contains sub-reports, one for each report required in the final document, publish and run this as the final report. This could happen way before actually running the report i.e. the user has a tool where they select reports for a pack, tool then generates new RDL file and publishes it to sql reporting services, gets run at some later point in time.
Some challenges:
-Generate a table of contents with page numbering?
-Layout of sub-reports, not sure how they would be rendered across multiple pages?
-Managing parametes across sub-reports at run time.
Any suggestions or ideas?
Thanks
T
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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] ....    Â
Is it possible to return the data in the following format merging 2 lines of data into one output:
 SiteID  ReadStartDate ReadEndDate    ReadStartIncome    ReadEndIncome
L0020Â Â Â Â 19/05/2015 05:00Â 20/05/2015 05:00Â Â Â 85.98Â Â Â Â 145.98
L0101Â Â Â Â 19/05/2015 22:07Â Â Â 20/05/2015 22:14Â Â Â Â Â Â Â Â Â 1,936.08Â Â Â Â Â Â 1,438.89
L0102Â Â Â Â 20/05/2015 21:16Â Â Â 19/05/2015 21:48Â Â 143.65Â 243.5
I am using SQL 2008 R2.
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Apr 26, 2004
I have got a query in which a merge join is 99% of the cost .... and I am confused ... is not merge join supposed to be the fastest ??? Anyone seen this before ???
Any ideas why this could be happening ... and sorry ... do not ask me to post the code coz I will not be able to ...
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Mar 3, 2008
Hi, all experts here,
Any advices for when will be a better way of using Merge join instead of other options?
Thank you very much and I am looking forward to hearing from you shortly.
Best regards,
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