I have two tables, one is LookUpTable where I have an id for AttendanceType = Remote. And I have another table where there is a column called AttendanceType.
I want to fetch the id from LookupTable and copy in all rows of another table into the column AttendanceType in SSIS package?
You can use merge join in ssis to join both the sources based on attendence type field and fetch required fields from both the tables.
You can use a MERGE JOIN query depending on your RDBMS.
You can also use the MERGE JOIN component and the SSIS OLE DB Destination. The data coming out of the sources must be sorted. To tell SSIS that the data is sorted, right-click on your source component. Click on show advanced editor then on input and output properties. Then pass the IsSorted box to True.
Then, you must indicate to SSIS which column acts as SortKey, ie on which column to sort the data.
Related
I'm a beginner in SSIS and i want to know a simple way to sync data between source/destination like:
Insert - Update - Delete data.
You can achieve the Insert-Updet-Delete with the Merge Join and Conditional Split components.
Let's consider you have a table Employees in SQL Server as your data source component and a table EmployeesSTG as your source data component for data existing in your staging database :
Your data in the DB Application Source :
You need to sort both dataset why because merge join component needs data to be sorted either in an ascending order or descending order so here we will sort the data in an ascending order with sort component available in SSIS :
This is how the Sort component is configured :
This is how the Merge Join is configured :
After merging data, you need to split data since you did left outer join if data matches then only both sides data will be there otherwise right side will be replaced with a null so unmatched data which has null value on right side you will considered as NEW data so you will insert that and rest you will match data column wise like if Position for example does not match with left side then you will update it.
Since you have split data into 3 parts so we need 3 destinations.
1- As per first condition data will be inserted so for this we will use OLEDB Destination component.
2- As per second condition data will be updated so for this we will use OLEDB Command component to write update command :
UPDATE Employees
SET FullName=?,
Position=?
WHERE EmployeeID=?
And this is the mapping overview :
3- As per the 3rd condition, you will delete the records in the staging table using an OLEDB Command component to write update command :
DELETE FROM Employees
WHERE EmployeeID=?
And this is the mapping overview :
I am working on a large SSIS data migration project in which all of the output tables have fields for the creation date & user as well as the last update date and user. The values will be the same for all of the records in all of the output tables.
Is there a way to define parameters or variables that will appear in the destination mapping window, and can be used to populate the output table?
If I use a sql statement in the source, I could, of course, include extra fields for this, but then I also have to add a Data Conversion task for translating the string fields from varchar to nvarchar.
You cannot do this in the destination mapping.
As you've already considered, you could do this by including the extra fields in the source, but then you are passing all that uniform data through the entire dataflow and perhaps having to convert it as well.
A third option would be to run through your data flow without those columns at all (let them be NULL in the destination), and then follow the data flow with an UPDATE that sets those columns with a package variable value.
I am pretty new to SSIS and BI in general, so first of all sorry if this is a newbie question.
I have my source data for the fact table in a csv, so I want to match the ids against the surrogate keys in lookup tables.
The data structure in the csv is like this
... userId, OriginStationId, DestinyStationId,..
What I am trying to accomplish is to match the data against my lookup table. So what I am doing is
Reading Lookup data using OLE DB Source
Reading my csv file
Sorting both inputs by the same field
Doing a left join by Id, in order to get the SK
This way, if there is no match (aka can't find the surrogate key) I can redirect that to a rejected csv and handle it later.
something like this:
(sorry for the spanish!)
I am doing this for each dimension, so I can handle each one with different error codes.
Since OriginStationId and DestinyStationId are two values from the same dimension (they both match against the same lookup table), I wanted to know if there's a way to avoid reading two times the data from the table (I mean, not to use two ole db sources to read twice the data from the same table).
I tried adding a second output to the sort but I am not allowed to. The same goes to adding another output from OLE DB Source.
I see there's an "cache option", is the best way to go ? (Although it would impy creating anyway another OLE DB source.. right?)
The third option I thought of was joining by the two fields, but since there is only one field in the lookup table (the same field) I am getting an error when I try to map both colums from my csv against the same column in my Lookup table
There are columns missing with the sort order 2 to 2
What is the best way to go for this ?
Or I am thinking something incorrectly ?
If something was not clear let me know and I'll update my question
Any time you wish you could have multiple outputs from a component that only allows one, all you have to do is follow that component with the Multicast component, whose sole purpose is to split a Data Flow stream into multiple outputs.
Gonzalo
I have just used this article on how to derive columns for a data warehouse building:- How to Populate a Fact Table using SSIS (part 1).
Using this I built a simple package that reads a CSV file with two columns that are used to derive separate values from the same CodeTable. The CodeTable has two fields Id and Description.
The Data Flow has two "Lookup" tasks. The first one joins the attribute Lookup1 against the Description to derive its Id. The second joins the attribute Lookup2 against the Description to derive a different Id.
Here is the Data Flow:-
Note the "Data Conversion" was required to convert the string attributes from the CSV file into "Unicode string [DT_WSTR]" so they could be joined to the nvarchar(50) description attribute in the table.
Here is the Data Conversion:-
Here is the first Lookup (the second one joins "Copy of Lookup2" to the Description):-
Here is the Data Viewer output with the to two derived Ids CodeTableFirstId and CodeTableSecondId:-
Hopefully I understand your problem and this is of use to you.
Cheers John
I am importing data from csv file(csv1) having columns userid, date and focus. there are multiple records of same userid having diferrent focus value and different dates. i need to pick focus of the user id having latest date and join it with another file (csv2) having userid( more than one same userid)fisrtname lastname and focus.
The result should be that in csv 2 all same userid must have focus set to that of latest focus in csv1 file.
Can someone help how to achieve this result.
Thanks in advance.
You can do that, but it takes 2 steps:
Step 1: Import csv2 (look-up table) into temporary table.
Step 2: Using SSIS, from "Data Flow Transformations" toolbox select "Lookup" item. Write a query to select data from temporary table. Define matching columns.
Also, there is "Merge Join" type of transformation, but it seems to me that you need "Lookup".
If you are not familiar with SSIS transformations, google for "ssis lookup transformation".
For CSV 1 & 2, use Aggregate transformation to get max date. Output of the transformation is unique records with latest table
Merge join CSV 1 & 2 , fetch desired columns from two input.
I am working on an SSIS data flow task.
The source table is from old database which is denormalized.
The destination table is normalized.
SSIS fails because the data transfer is not possible because of duplicates (duplicates in primary key column).
It would be good if the SSIS can checks the destination for availability of current record (by checking the key) and if it exists , it can ignore pushing it. Then it can continue with the next record.
Is there a way to handle this scenario?
Assuming your destination table is a subset of your source table, you should be able to use the Sort Transformation to pull in only the columns you need for your destination table, and then check the "Remove rows with duplicate sort values" to basically give you a distinct list of records based on the columns you selected.
Then, simply route the results of the sort to your destination, and you should be good to go.