I have a Datastage job which takes the data from a file to a Dataset and for a column I would like to make a transformation in order to exclude the rows where that columns has no value:
For example I use in the transfomer the following rule where I put 0 everytime I find no value in the column lcvInstalmentOriginalStr, but I need this row to be discarded from the begining.
If lcvInstalmentOriginalStr <> "" Then StringToDecimal(lcvInstalmentOriginalStr) Else 0
Thank you
You can use a condition within a transformer stage (for example) to put just those rows on the output link (to the Dataset) that hold data.
The condition could look like this
lcvInstalmentOriginalStr <> ""
Related
I have a task to create tetrapeptide screening library aminoacids using Knime. I have never used Knime before sadly. I need to create a workflow with all 20 aminoacids, multiply it with another 20, then multiply the result with another 20 and repeat to get final result of tetrapeptides. Can someone suggest me how to input aminoacids on the Knime? Thank you very much!
Use a Table Creator node to enter the Amino acid single-letter codes, one per table. Now use a Cross Joiner node to cross-join the table to itself - you should now have a table with rows like:
A|A
A|C
etc.
Now put this table into both inputs of a second Cross Joiner node, which should give you now quite a long table starting something like:
A|A|A|A
A|A|A|C
A|C|A|A
A|C|A|C
etc.
Now use a Column Aggregator node, select all column as aggregation columns, the aggregation method as Concatenate and change the delimiter to an empty string:
and:
This will give you a table with a single column, 'Peptide':
AAAA
AAAC
ACAA
ACAC
etc.
If you want the output as a chemical structure, then as of v1.36.0 the Vernalis community contribution contains a node Speedy Sequence to SMILES which will convert the sequence to a SMILES string (make sure you select the option that your input column is a Protein!)
The full workflow is as shown:
I am trying to find the best way to clean my data using either T-SQL or a tool within Power BI.
included is a snippet of my data, I would usually do this in Excel using multiple tables & VLOOKUP however my data set contains 2+ million Rows so this isn't an option.
I need a function that:
Iterates through each row looking at each 'SiteID'
checks related 'flow' value for 'NULL' or '0'
If 'NULL' or '0' finds all the rest of the 'SiteID's' with the same value in the full data set in the rows above or below
Removes all rows with matching 'ID'S' Regardless if any other 'null' or actual value exists
Moves onto next record checking same & continuing iteration of complete data set
is this something which is possible? thanks for any advice or help :)
Sample data values
I want to add another thing, if you have a million rows of data, iteration is not a good option to think about. I guess all you want is to remove records having Null or 0 in flow. I perfer to use CTE just to be clear in logic.
;WITH deletion AS
(
SELECT SiteID
FROM Table1
WHERE Flow = 0 or Flow is null
)
DELETE T
FROM Table1 T
INNER JOIN Deletion D on T.SiteID = D.SIteID
I am trying to compute a N_break that has to "satisfy" a condition. I have a variable which indicates 1 or 0. Lets call that variable "HT". Every lopnr is also labled in every row multiple times. So first 10 rows can be ID nr 1. And next 20 can be ID nr 2 and so on.
My question is: How do i create a N-break with lopnr as breakvariable that has to have HT=1? I am not allowed to select only 1s on variable HT before, since i need the 0s in the file.
A few simple ways to do this:
1 - USE FILTER
filter cases by HT.
aggregate ....
when you get back to original dataset, use:
filter off.
use all.
2 - COPY DATASET
dataset name orig.
dataset copy foragg.
dataset activate foragg.
select if HT.
aggregate....
3 - TEMPORARY SELECTION
temporary.
select if HT.
aggregate....
I have an excel sheet with many tabs. Say one is called wsMain and the other is called wsDate.
In my data flow transformation I am able to successfully load the data from wsMain to my table.
Now I have to update this transformation where I have to fetch the maximum date from the worksheet wsDate and only load data from wsMain where the date is less than on equal to the maximum date in wsDate (that is the only column available).
So for I have figured out that I need to create a new Excel connection manager to read the data from wsDate and I have used the Aggregate transformatioin to get the maximum date.
Now the question is how do I use this date to restrict the rows coming from wsMain?
I understand from the link below that you can store the value in a variable but what do I do next?:
SSIS set result set from data flow to variable
I have tried using a merge join but not sure if I am doing it right.
Here is what it looks like now:
I could not achieve the above but would be interested to know if that is possible. As a work around I have created a separate dataflow where I have stored the valued in a variable and then used the variable in the conditional split to filter the required rows:
Here is a step by step guide I followed to write the variable:
https://www.proteanit.com/2008/12/11/ssis-writing-to-a-package-variable-in-a-dataflow/
You can obtain the maximum value of the wsDate column first, this use this as a filter to avoid introducing unnecessary records into the data flow which which would be discarded by the Conditional Split. An overview of this process is below. I'd also recommend confirming the data types for all columns involved.
Create an SSIS DateTime variable and name this something descriptive such as MaxDate.
Create a Data Flow Task before the current one with an Excel Source component. Use the SQL command option for the Data Access Mode and enter a SQL statement to return the max value of the wsDate column. In the following example ExcelSource is the name of the sheet that you're pulling from. I'd suggested confirming the query with the Preview button on the Excel Source as well.
Add a Script Component (not Task) after the Excel Source. Add the MaxDate variable in the ReadWriteVariables field on the main page of the Script Component. On the Inputs and Outputs pane add the output column from the Excel Source as an Input Column with the ReadOnly usage Type. Example C# code for this is below. Note that variables can only be written to in the PostExecute method. The Input0_ProcessInputRow method is called once for each row that passes through, however there will only be the single row in this case. On the following code MaxExcelDate is the name of the output column from the Excel Source.
On the Excel Source component in the Data Flow Task where the records are imported from Excel, change the Data Access Mode to SQL command and enter a SQL statement to return records that have a date less than or equal to the maximum wsDate value. This is the last example and the ? is a placeholder for the parameter. After entering this SQL, click the Parameters button and select Parameter0 for the Parameters field, the MaxDate variable for Variables field, and a direction of Input. The Conditional Split can then be removed since these records will now be filtered out.
Excel MAX wsDate SELECT:
SELECT MAX(wsDate) AS MaxExcelDate FROM ExcelSource
C# Script Component:
DateTime maxDate;
public override void PostExecute()
{
base.PostExecute();
Variables.MaxDate = maxDate;
}
public override void Input0_ProcessInputRow(Input0Buffer Row)
{
maxDate = Row.MaxExcelDate;
}
Excel Command with Date Filter:
SELECT
Column1,
Column2,
Column3
FROM ExcelSheet
WHERE DateColumn <= ?
Yes, it is possible. In the data flow, you will need to determine the max date, which you already have. Next, you will need to MERGE JOIN the two data flows on the date column. From there, you will feed it into a CONDITIONAL SPLIT and split where the date columns match [i.e., !ISNULL()] versus do not match [i.e., ISNULL()]. In your case, you only want the matches. The non-matches will be disregarded.
Note: if you use an INNER JOIN on the MERGE JOIN where there is only one date (i.e., MaxDate) to join on, then this will take care of the row filtering for you. You will not need a CONDITIONAL SPLIT.
Welcome to ETL.
Update
It is a real pain that SSIS's MERGE JOINs only perform joins on EQUAL operations as opposed to LESS THAN and GREATER THAN operations. You will need to separate the data flows.
Use a script component to scan the excel file for the MAX Date and assign that value to a package variable in SSIS. Alternatively, you can have a dates table in SQL Server and then use an Execute SQL Command in SSIS to retrieve the MAX Date from the table and assign that value to a package variable
Modify your existing data flow to remove the reading of the Excel date file completely. Then add a DERIVED COLUMN transformation and add a new column that is mapped to the package variable in SSIS that stores the MAX date. You can name the Derived Column Name 'MaxDate'
Add a conditional split transformation with the following CONDITION logic: [AsOfDt] <= [MaxDate]
Set the Output Name to Insert Records
Note: The CONDITIONAL SPLIT creates a new output data flow with restricted/filtered rows. It does not create a new column within the existing data flow. Think of this as a transposition of data flow output from column modification to row modification. Only those rows that match the condition will be sent to the output that you desire. I assume you only want to Insert these records, so I named it that. You can choose whatever naming convention you prefer
Note 2: Sorry for not making the Update my original answer - I haven't used the AGGREGATE transformation before so I was not aware that it restricts row output as opposed to reading a value in the data flow and then assigning it to a variable. That would be a terrific transformation for Microsoft to add to SSIS. It appears that the ROWCOUNT and SCRIPT COMPONENT transformations are the only ones that have the ability to set a package variable value within the data flow.
My data in CSV is like this(Expected Image):
Actual Data
And I want to convert this Data into:
Expected Data
(hivetablename.hivecolumnname = dbtablename.dbtablecolumn)
By joining the multiple Row values into a Single row value like above.
Please note that 'AND' is a Literal between the condition to be built, which would appear until the second last record.
Once the Last Record is reached, Only the condition would appear(xx=yy)
I wish the result to be in SCALA SPARK.
Many thanks in advance!