Problem With Convertion Of Datatypes From Derived Column To Slowly Changed Dimensions
Jul 24, 2006
Hi,
I am facing the problem with datatype conversions, the scenario is using derived column transformation for add additional columns and then later i am trying to impliment Slowly changing dimensions(SCM) in my job, while mapping the columns at SCM from Input to Output it gave the error like suppose if i am using the numeric(3,0) at SRC system then i converted it into single byte unsigned at derived column and it recognized at SCD but the job fail while run the package it gave the error as task can not able to conversted given data type to target system dtata type.. ifi am not given the single byte unsigned data type at dervied column at the level of SCD mapping the input to output its not accapring this mapping and return the error as can be convert from system.decimal to system.byte..
Sreenivas Amirineni
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Oct 16, 2007
I have a column age ( smallint) in derived transformation .. I would likt to convert it to A or B which is char(1)
hwo can i convert smallint to char(1) in derived column?
age > 17 ?"A" : "B"
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Jan 29, 2007
I am new to SSIS and I am investigating using the Slowly Changing Dimension transform.
The data source that I receive is a daily snapshot of the external source system table. I need to store the history of the entity attributes (Type 2 SCD) and I am using the Start / End Date mechanism.
When an entity (identified by the business key) is no longer received in the source snapshot, I would like the data flow to update the End Date of the current row to show that the entity has now expired.
Does anyone have any suggestions for a good way to achieve this ?
NB: Changing the source system extract to include and flag expired entities is not an option for me.
Many thanks
Graham
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Jan 25, 2008
Hi, All experts here,
Thank you for your kind attention.
I have questions about Slowly Changing Dimensions. I am quite confused about when should we use type 1 ( changing), type2 (historical), or type3( fixed) for the dimensions in each table? Is there any good suggestions on that?
Thank you in advance and I am looking forward to hearing from you.
Yours sincerely,
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May 2, 2008
Hi,
I would like to know if there is an easy way to load Hierarchical Dimensions with Type 2 using SSIS ( or in general).
Here is my example:
There is a Hierarchy Product Group <- Product Class <- Product. (In words, Product rolls up to Product Class and Product Class Rolls up to Product Group). Say Product Group is Type 1 and the other two are Type 2. Every night, I receive a feed for each of these tables only if the record is new or a change to an existing record.
Now, when a Product Class Record is changed to assign it to a different group then I receive the feed only for Product Class (but not for Product). To load this record, I expire the old record and create a new entry with a new Surrogate Key. Then how do I automatically cascade this change to Product and make a Type 2 change to use the new Surrogate Key from Product Class?
Any ideas would be greatly appreciated.
Thanks,
Srini
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Jan 20, 2006
Hello,
We are having issues with SCDs that appear to be volume related. Small dimensions work fine. Pasted below is the last few lines of our package run without any contention (We get different errors at different time with contention referring to buffer or virtual memory). It seems to be calling out the SCD main task but just gives a number and not much of a description.
2) For the errors referring to a buffer ( I can paste them also but did not want to put too much at once); we have the "BufferTempStoragePath" pointing to a drive with lots of space. We have tinkered with the DefaultBufferMax Rows and Size but that seems to just control how big the "batches" are (the row count size changes you see).
Any configuration type things we could try to avoid these errors? Any more detail that can be gleaned from the messages below or the number? This is kind of a show stopper as we are late in the cycle and need larger (at this point only about 600,000 rows) volumes to go through the SCD tasks. The performance seems to be good enough (about 20 minutes). We have tens of millions working fine in fact packages not using SCDs.
Thanks. Geoff
Information: 0x4004300C at Data Flow Task, DTS.Pipeline: Execute phase is beginning.
Error: 0xC0047022 at Data Flow Task, DTS.Pipeline: The ProcessInput method on component "Slowly Changing Dimension" (45421) failed with error code 0x8007000E. 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.
Error: 0xC0047021 at Data Flow Task, DTS.Pipeline: Thread "WorkThread0" has exited with error code 0x8007000E.
Error: 0xC0047039 at Data Flow Task, DTS.Pipeline: Thread "WorkThread1" received a shutdown signal and is terminating. The user requested a shutdown, or an error in another thread is causing the pipeline to shutdown.
Error: 0xC0047021 at Data Flow Task, DTS.Pipeline: Thread "WorkThread1" has exited with error code 0xC0047039.
Error: 0xC02020C4 at Data Flow Task, Control File Extended view as source [959]: The attempt to add a row to the Data Flow task buffer failed with error code 0xC0047020.
Error: 0xC0047038 at Data Flow Task, DTS.Pipeline: The PrimeOutput method on component "Control File Extended view as source" (959) returned error code 0xC02020C4. The component returned a failure code when the pipeline engine called PrimeOutput(). The meaning of the failure code is defined by the component, but the error is fatal and the pipeline stopped executing.
Error: 0xC0047021 at Data Flow Task, DTS.Pipeline: Thread "SourceThread0" has exited with error code 0xC0047038.
Information: 0x40043008 at Data Flow Task, DTS.Pipeline: Post Execute phase is beginning.
Information: 0x40043009 at Data Flow Task, DTS.Pipeline: Cleanup phase is beginning.
Information: 0x4004300B at Data Flow Task, DTS.Pipeline: "component "Insert New Rows into Product Dim" (51111)" wrote 0 rows.
Task failed: Data Flow Task
Warning: 0x80019002 at ProductDimensionIncr: The Execution method succeeded, but the number of errors raised (7) reached the maximum allowed (1); resulting in failure. This occurs when the number of errors reaches the number specified in MaximumErrorCount. Change the MaximumErrorCount or fix the errors.
SSIS package "ProductDimensionIncr.dtsx" finished: Failure.
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Apr 20, 2015
Should we have foreign key relationship between two slowly changing dimensions?
Most of the cases we talked about are about how to build an SLC, any example of trying to have two SLCs with FK relationship in a snow flake schema?
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Oct 8, 2007
I changed a datatype on a table column. I expected this revision to be reflected in the table view column but the old datatype shows. I'm using SQL Server Express. Is there something I should specify when editing the column so I don't have to drop/add the view? (btw, column has an alias in the view)
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Aug 29, 2006
I created a simple type 1 slowly changing dimension, setting all the columns to "Changing Attibute". The first time I run the package it sees all rows as new and imports them into the dim as it should. Next time I run it put 100% of the rows into the "Changing Attribute Updates" and runs an update on all 90,000 rows - updating the rows to exactly what they were before
If I take the DIM and the Source in SQL and join on every row the join succeeds (meaning the rows match perfectly).
Shouldn't the SCD object just ignore the rows if they match? Or does it assume that ALL incoming rows are either new or changed? (if so why is there an output called "Unchanged Output"?). Is there some "gotcha" I am missing??
Thanks
Chris
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Jul 22, 2015
how to declare multiple derived columns in SSIS Derived Column Task in one attempt.as i have around 150 columns coming from Flat file. I had created the required Expression in Excel and now i want add those in derived column task but its allowing only 1 expression at a time.
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Feb 28, 2008
Hi, all experts here,
Do we always have to use SCD component for the loading of data into data warehouse to handle changes of rows?
I am looking forward to hearing from you and thank you very much in advance for your help.
With best regards,
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Jul 28, 2015
I have a excel file which has a column called "Code" and their values are A,B,C,D,E,F,G,H. I want to create a new column called "status" based on the values of "Code".
Code:
A
B
C
D
E
F
G
H
If A,C,E,G then "status" = "Active" else if B,D,F,H then "Status" = "Inactive". I like to do it using "Derived Column".
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Mar 5, 2007
Hi,
I have dates in "mmddyy" format coming from the sources and they are older dates of mid 80s like 082580 for instance.
When I cast it this way (DT_DBTIMESTAMP) Source_Date , It says ok but throws a runtime error.
When I hardcode a date in same format, (DT_DBTIMESTAMP) "082580" , It becomes red (an indication of syntax error) . Please note that we use double quotes in expressions in Derived Column Transformation; So an anticipation that using double quotes over single ones would be the syntax problem would be wrong.
Any help in this will sincerely be appreciated.
Thanks
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Sep 11, 2007
Posted - 09/10/2007 : 15:53:26
Hey all - got a problem that seems like it would be simple (and probably is : )
I'm importing a csv file into a SQL 2005 table and would like to add 2 columns that exist in the table but not in the csv file. I need these 2 columns to contain the current month and year (columns are named CM and CY respectively). How do I go about adding this data to each row during the transformation? A derived column task? Script task? None of these seem to be able to do this for me.
Here's a portion of the transformation script I was using to accomplish this when we were using SQL 2000 DTS jobs:
'**********************************************************************
' Visual Basic Transformation Script
'************************************************************************
' Copy each source column to the destination column
Function Main()
DTSDestination("CM") = Month(Now)
DTSDestination("CY") = Year(Now)
DTSDestination("Comments") = DTSSource("Col031")
DTSDestination("Manufacturer") = DTSSource("Col030")
DTSDestination("Model") = DTSSource("Col029")
DTSDestination("Last Check-in Date") = DTSSource("Col028")
Main = DTSTransformStat_OK
End Function
***********************************************************
Hopefully this question isnt answered somewhere else, but I did a quick search and came up with nothing. I've actually tried to utilize the script component and the "Row" object, but the only properties I'm given with that are the ones from the source data.
thanks in advance!
jm
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Oct 1, 2014
I am looking to filter the query using the free text predicate Contains for one of the column that have dimensions of the items. The query is something like
Select * from sampletable
where contains(filtercolumn, 'Near("*cm , *cm , *cm , *Kg.",10,True)')
Data in the filtercolumn is something like 64cm x 25cm x 35cm = 10Kg.
The query do not return any data.I also tried running the below query to see if cm* can be searcher for, but with no result again
Select * from sampletable
where contains(filtercolumn,, '"cm*"')
If I do something like below, it does return all columns that have 35cm within the text.
Select * from sampletable
where contains(filtercolumn,, '"35cm"')
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Nov 6, 2007
All,
I've converted datatypes in the past to something more appropriate in order to save space, and speed up the database, to great success. I'm in the middle of another such change, this one table in particular I am converting from [text] columns to varchar(max)'s, and varchar(1)'s to char(1)'s. I've made a duplicate of the table in question (which has about 25 text columns, and 20 varchar(1) columns), ported over the data, and ran 'sp_spaceused' and got the following results:
-- new table
name | rows | reserved | data | index_size | unused
Response | 39920 | 15384 KB | 15168 KB | 208 KB | 8 KB
-- old table
name | rows | reserved | data | index_size | unused
Response | 39920 | 124128 KB | 123696 KB | 200 KB | 232 KB
I didn't expect results quite this dramatic. Now to my question: Did I miss something measuring the difference? Is there something else, another method I should employ to determine the size differentials?
If this is right, it's outstanding, just unexpected. I would have been happy losing 10 or 20 MB.
I appreciate any insight anyone might be able to provide.
Best,
B.
Just fyi - here are the table schemas:
-- old table
CREATE TABLE [dbo].[Response](
[ResponseID] [varchar](30) NOT NULL,
[Term] [varchar](5) NOT NULL,
[Subject] [varchar](4) NOT NULL,
[Course] [varchar](4) NOT NULL,
[Sect] [varchar](3) NOT NULL,
[MidEndFlag] [varchar](3) NOT NULL,
[SID] [varchar](9) NOT NULL,
[TemplateID] [varchar](30) NOT NULL,
[LastModified] [datetime] NULL,
[College] [varchar](30) NULL,
[Classification] [varchar](10) NULL,
[CourseRequired] [varchar](3) NULL,
[ExpectedGrade] [varchar](10) NULL,
[Sex] [varchar](6) NULL,
[ItemAnswer1] [varchar](1) NULL,
[ItemComments1] [text] NULL,
[ItemAnswer2] [varchar](1) NULL,
[ItemComments2] [text] NULL,
[ItemAnswer3] [varchar](1) NULL,
[ItemComments3] [text] NULL,
[ItemAnswer4] [varchar](1) NULL,
[ItemComments4] [text] NULL,
[ItemAnswer5] [varchar](1) NULL,
[ItemComments5] [text] NULL,
[ItemAnswer6] [varchar](1) NULL,
[ItemComments6] [text] NULL,
[ItemAnswer7] [varchar](1) NULL,
[ItemComments7] [text] NULL,
[ItemAnswer8] [varchar](1) NULL,
[ItemComments8] [text] NULL,
[ItemAnswer9] [varchar](1) NULL,
[ItemComments9] [text] NULL,
[ItemAnswer10] [varchar](1) NULL,
[ItemComments10] [text] NULL,
[ItemAnswer11] [varchar](1) NULL,
[ItemComments11] [text] NULL,
[ItemAnswer12] [varchar](1) NULL,
[ItemComments12] [text] NULL,
[ItemAnswer13] [varchar](1) NULL,
[ItemComments13] [text] NULL,
[ItemAnswer14] [varchar](1) NULL,
[ItemComments14] [text] NULL,
[ItemAnswer15] [varchar](1) NULL,
[ItemComments15] [text] NULL,
[ItemAnswer16] [varchar](1) NULL,
[ItemComments16] [text] NULL,
[ItemAnswer17] [varchar](1) NULL,
[ItemComments17] [text] NULL,
[ItemAnswer18] [varchar](1) NULL,
[ItemComments18] [text] NULL,
[ItemAnswer19] [varchar](1) NULL,
[ItemComments19] [text] NULL,
[ItemAnswer20] [varchar](1) NULL,
[ItemComments20] [text] NULL,
[EssayQuestionAnswer1] [text] NULL,
[EssayQuestionAnswer2] [text] NULL,
[EssayQuestionAnswer3] [text] NULL,
[EssayQuestionAnswer4] [text] NULL,
[EssayQuestionAnswer5] [text] NULL,
CONSTRAINT [PK_Response] PRIMARY KEY CLUSTERED
(
[SID] ASC,
[TemplateID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
-- new table
CREATE TABLE [Test].[Response](
[ResponseID] [varchar](30) NOT NULL,
[Term] [varchar](5) NOT NULL,
[Subject] [varchar](4) NOT NULL,
[Course] [varchar](4) NOT NULL,
[Sect] [varchar](3) NOT NULL,
[MidEndFlag] [varchar](3) NOT NULL,
[SID] [varchar](9) NOT NULL,
[TemplateID] [varchar](30) NOT NULL,
[LastModified] [datetime] NULL,
[College] [varchar](30) NULL,
[Classification] [varchar](10) NULL,
[CourseRequired] [varchar](3) NULL,
[ExpectedGrade] [varchar](10) NULL,
[Sex] [varchar](6) NULL,
[ItemAnswer1] [char](1) NULL,
[ItemComments1] [varchar](max) NULL,
[ItemAnswer2] [char](1) NULL,
[ItemComments2] [varchar](max) NULL,
[ItemAnswer3] [char](1) NULL,
[ItemComments3] [varchar](max) NULL,
[ItemAnswer4] [char](1) NULL,
[ItemComments4] [varchar](max) NULL,
[ItemAnswer5] [char](1) NULL,
[ItemComments5] [varchar](max) NULL,
[ItemAnswer6] [char](1) NULL,
[ItemComments6] [varchar](max) NULL,
[ItemAnswer7] [char](1) NULL,
[ItemComments7] [varchar](max) NULL,
[ItemAnswer8] [char](1) NULL,
[ItemComments8] [varchar](max) NULL,
[ItemAnswer9] [char](1) NULL,
[ItemComments9] [varchar](max) NULL,
[ItemAnswer10] [char](1) NULL,
[ItemComments10] [varchar](max) NULL,
[ItemAnswer11] [char](1) NULL,
[ItemComments11] [varchar](max) NULL,
[ItemAnswer12] [char](1) NULL,
[ItemComments12] [varchar](max) NULL,
[ItemAnswer13] [char](1) NULL,
[ItemComments13] [varchar](max) NULL,
[ItemAnswer14] [char](1) NULL,
[ItemComments14] [varchar](max) NULL,
[ItemAnswer15] [char](1) NULL,
[ItemComments15] [varchar](max) NULL,
[ItemAnswer16] [char](1) NULL,
[ItemComments16] [varchar](max) NULL,
[ItemAnswer17] [char](1) NULL,
[ItemComments17] [varchar](max) NULL,
[ItemAnswer18] [char](1) NULL,
[ItemComments18] [varchar](max) NULL,
[ItemAnswer19] [char](1) NULL,
[ItemComments19] [varchar](max) NULL,
[ItemAnswer20] [char](1) NULL,
[ItemComments20] [varchar](max) NULL,
[EssayQuestionAnswer1] [varchar](max) NULL,
[EssayQuestionAnswer2] [varchar](max) NULL,
[EssayQuestionAnswer3] [varchar](max) NULL,
[EssayQuestionAnswer4] [varchar](max) NULL,
[EssayQuestionAnswer5] [varchar](max) NULL,
CONSTRAINT [PK_Test_Response] PRIMARY KEY CLUSTERED
(
[SID] ASC,
[TemplateID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
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Dec 21, 2007
Can anyone show how to alter the value in a column using DerivedColumn component when creating an SSIS package programatically.
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Mar 25, 2008
Table structure as follows
Employee
Empno empname salary
commission
I want to have an other employee table named employee_modified
Empno empname salary
commission derived_column1(salary+commission)
derived_column2(derived_column1 + xxxx) and so on derive other
columns based on the earlier derived columns)
Is that possible to do it.. or am I doing something wrong.
something like
Select empno , empname , salary , commission,
(salary + commission) as derived_colum1 ,
(derived_colum1 + xxxxx) as derived_colum2 ,
(derived_colum2 + xxxxx) as derived_colum3
into employee_modified from employee
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Feb 25, 2008
Hi, how are you?
I'm having a problem and I don't know if it can be solved with a derived column expression. This is the problem:
We are looking data in a a sql database.
We are writting the SQL result in a flat file.
We need to transform data in one of the columns.
For example: we can have 3 digits as value in a column but that column must be 10 digit length. So we have to complete all the missing digits with a zero. So, that column will have the original 3 digits and 7 zeros. How we can do that tranformation? We must do it from de the flat file or it can be a previous step?
Thanks for any help you can give me.
Regards,
Beli
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Jun 5, 2014
In Oracle when i create any procedure i define parameter datatype linked to under lying table.
For ex
create procedure testprocedure
(param1 customer.name%type,
param2 customer.salary%type )
Here i have defined param1 and param2 with datatype of name and salary of customer table respectively.
This way i do not need to worry about modifying param1 and param2 datatypes when datatypes of name & salary of customer table changes in future.
How can i accomplish this in SQL server.
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Feb 22, 2006
I have added a Slowly Changing Dimension transformation to an SSIS package and have launched the Wizard to edit it. After selecting the source (a SQL Server 2005 instance), if I select a very large table (9+ million rows), I'm encountering two strange behaviors:
1. The wizard hangs for several minutes before displaying the columns from that table.
2. The wizard does not display the primary key column. This, of course, is the column I want to designate as the "business key", but can't because it's not displayed.
I know this is more like a fact table than a dimension, but this is not a data warehouse. This is just a very large table, and I need to update a field in certain records based on the contents of a source text file. Is there another transformation I should use to perform updates?
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Oct 12, 2007
I had an issue that I ran across that I got solved but it was very monotonous. Here is my issue:
I have an SQL function that takes in 2 parameters (lookup category and lookup code) and with those parameters is goes out and find the lookup code description. I have this function in about 40 computed columns. It isn€™t the best way to do things but we need it for some legacy stuff. The problem occurs when I need to make a change to that function. I can€™t because it is being reference by all of the tables. So what I have to do is go in to each of the tables and remove the function from the column formula. Then change the function and then finally add that function back to the column.
Here is what I did.
I went to the syscolumn table to find all of the computer columns. I went to each of those columns and removed the formula and added it to a text document. Then I changed the function. I then wrote a stored procedure that would add the column back. ( I couldn't find a way to use the ALTER COLUMN to add the function so I had to drop and then add the column )
Here are the possible scenarios that I want to see if they are possible.
1) Somehow €œturn off€? the dependency between the function and the column. That way I can just update the function.
OR
2) Programmatically grab the data from the column formula and write that some place and clear out the formula. Then update the function. Then finally take all of the data that was cleared out and write it back to the column.
Does anyone know how to make this easier?
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Mar 12, 2013
I am writing a db conversion for a retail grocery chain. This chain uses pricing zones to designate what stores get a certain price
Example:
Cheetos
Zone A: $2.79
Zone B: $2.89
The pricing data in the tables is listed by zone. However, the new product uses pricing by store.
Zone A contains stores 1,2,4,6,7....
Zone B contains stores 10,11,12,14.....
I need to be able to duplicate the rows in a manner that I can take the row containing a price for Zone A and duplicate it for each store in the zone. I have a table of stores with corresponding zones.
So I'm looking to go from:
Zone UPC Price
A 1234500000 2.79
B 1234500000 2.89
To:
Store UPC Price
1 1234500000 2.79
2 1234500000 2.79
10 1234500000 2.89
11 1234500000 2.89
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Aug 18, 2014
How can I compare column in the same table and show only column and value that has been changed.
declare @t table (GroupID CHAR(6),Text1 VARCHAR(MAX),Text2 VARCHAR(MAX),Text3 VARCHAR(MAX))
insert into @t
SELECT '11111','Text1','Text2','Text3'
insert into @t
SELECT '11111','Text1','Text2','Text4'
END RESULTS:
Column Name Old New
Column 3 |'Text3' |'Text4'
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Jul 20, 2005
I have a need to insert rows into an Audit type table when valueschange in certain fields in a table. I thought I could do this via atrigger. However, on requirement is to include in the audit both theold and new value.Is there a "simple" way to do this? I know I could query the tablebefore the update and compare to what the new value is and reactaccordingly.Just wondering if there is something nifty in Sql Server that I ammissing that could help me with this.Thanks in advance for your help.Bill
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May 6, 2008
Hi, wondering if anyone can help me. I currently have a field that has a date and time in it in the format dd/mm/yyyy hh:mm:ss. Ideally I would like to get rid of the time part of it altogether but for it to still be recognised as a date as opposed to a string. However, I've been told that this is not possible in 2005, is this true? If this is the case, what would be the best way to set the time to 00:00:00 after the date for all records on that field?
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Jan 30, 2007
I have two columns made up of 4 digits numbers eg col1 1234, col2 9876
I want to create a derived column so i get a eight digit column, eg col3 12349876
I cannot seem to get the expression right, I seem to be always adding the value which i do not want, can someone help me out with the expression
Thanks
Robbie
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Dec 3, 2007
I am trying to transfer data from SQL Server 2005 table to another SQL Table. In the source table there is a field called Region [nvarchar(max)]. The values for these fields will be like APAC-China, NA-Racine, etc., i.e Region followed by the country name seperated by - symbol. I want the destination tablre with 2 fields Region[nvarchar(max)] and Country [nvarchar(max)]. I am using a Derived Column task to achieve the same.
Can anyone please help me out in doing this data conversion?
Thanks
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Nov 2, 2007
Hi,
I am doing a task which will get all data based on several base and crosswork tables. I used stored procedure to get the data, but the next step will be using derived column to massaging data, and to load to the destination database. Is there a way to do that since I must generate data on the fly?
Thanks,
Megan
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Jul 16, 2007
Hi Guys,
How can i put in a derived column the value of 3 columns? I've tried these:
[MyId]+[Paper1]
"[MyId]+[Paper1]"
but no luck. How can i put it right?
Thanks
Gemma
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Mar 31, 2008
I am trying to create a derived column from two separate fields. One is a date field in format of 2008-03-01 and one is a time field. In DTS I use to have something like this:
DTSDestination("TransactionDate") = cdate(DTSSource("DSRHDATI")) & " " & timevalue(DTSSource("DSRHTIME"))
I am trying to figure out how to do this in SSIS. I know I have to use a dervived column but can't seem to come up with the correct syntax. Any help would be apprecaited. thanks.
Stacy
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Jun 6, 2007
Can someone help me with the following query? I need to take the derived value from one column and calculate another column with it.
SELECT UserID,
((SELECT COUNT(*) FROM HPN_LeadMatches)+(SELECT COUNT(*) FROM HPN_Painters)) As Total,
(SELECT COUNT(*) FROM HPN_Leads) / Main.Total
FROM HPN_LeadMatches As Main
The error i'm getting says is unkown column 'total'. Is there another way to accomplish this?
Thanks!!
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Jul 26, 2006
In a Derived Column data flow transformation, why can't I refer to a derived column (added in that same transformation) in the expression for another derived column? It seems I am forced to chain 2 DC data flows, just to do something as conceptually simple as:
a = x + y; b = a²
On a related note: Can I define a variable that is scoped to each row? Can I bind a variable in an expression to avoid creating a new row, e.g.
let a = x + y; a²
as the expression for new row b?
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