Dimensions Vs. Factless Fact Tables
Jan 17, 2005
I am building a health care application that marries transaction-level data (health care services provided) with person-level characteristics that have a time-dimension. The person-level characteristics are diseases that the person has (these disease all have a start and some have an end date). The diseases are stored in a table in which the foreign keys are a person-identifier, a time identifier (month/year) and a surrogate for the disease. Persons can have more than one disease at a time (the diseases are NOT mutually-exclusive). There are no measures in this table. The transaction table has a foreign key for person and time (month/day/year), a procedure code (the type of service rendered) and money (the cost of the services).
How do I answer the following questions:
What is the total cost of care (the sum of all service costs) last year for persons with "disease A"?
What is the total cost of care last year for persons with "disease A" AND "disease B"?
What is the total cost of care last year for persons with "disease A" OR "disease B"?
I've tried a factless fact table but can't get it to work. If anyone has the right solution and can communicate to me before I slit my wrists, I would be greatly appreciative!!!
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Jul 10, 2007
Hello Everybody,
Can anybody please let me know the procedure for loading data into Dimensions & Facts? And what is the sequence of loading?
Thanks in Advance
Rajesh
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Jul 6, 2015
I built my first tabular model and see that my fact tables are also appearing as dimensions. In Multi dimensional mode i could choose which are the dimensions. How do i do that in tabular model.
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May 17, 2007
Hi,
I am relatively new to SSIS/SSAS. I have searched the forums but cannot find an answer to my question.
I created a cube in SSAS and have deployed it. Now I am trying to use SSIS to populate the cube. I have setup a DS that points to the SSAS instance - it uses OLEDB Provider for Analysis services 9.0.
When I try to use a data flow task OLE DB source to truncate the dimension/cubes I do not see the DS in the list to select?
I am finding it hard to get into the SSIS way of organizing the processing.
Any Ideas?
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May 22, 2008
Hi,
I have 2 fact tables and 2 dimensions (one of them is time).
fact1 ---- pk-fk ------ fact1-details-table
(date) |
| Dimension.
|
TimeDim
Is there a way to define measure group on fact1-details-table using TimeDim. Date info is only in fact1 table and not in details table.
Is namedquery joining the 2 fact tables the best solution in this case? There is so much redundancy using one fact table, so underlying sqldb uses 2 tables.
Thanks,
Chandra.
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May 30, 2007
What are the general guildlines for choosing these settings, like paralle vs. sequential, different error configurations? The default selection for processing multiple dimensions is paralle and use default error configuration. But the default for processing multiple partitions is sequential. I cannot find anything helpful other than the definitions from the online help. TIA.
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Jul 15, 2015
I am modelling two fact tables of Actuals and Budget which are at different granularity, Actuals are at day, customer and product sub category level. Budgets are at month, Region and Product category level.
Month, Region and Product Category is present in Date, Region and Product Category dimension respectively. I have only three dimensions as Customer, Product and Date. Linking those dimensions to Actual Fact table is not an issue, what is the best way and options are there to link budget fact table to those three dimensions.
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Aug 16, 2007
Hi,
I use lookups to map surrogate of level 1 dimensions to my fact tables in SSIS.
But how to handle a level 2 dimension with a ValidFrom and a ValidUntil date field?
I do not use an IsCurrent column, because this could problem with late arriving facts.
- In dts I used an SQL statement like this:
update SA
SET SA.DimProdRef = Dim.RecordID
FROM SAWarenEingang SA, DimProd Dim
where SA.ProduktNumber = Dim.ProduktNumber
and SA.ArtikelkontoBewegungsdatum between Dim.ValidFrom and Dim.ValidUntil
Now in SSIS I want to handle the whole thing in the data flow without using a staging table:
- Using Lookups: I would have to pass the date column for each inside the fact table into the lookup. That does not work.
- Using Execute SQL in the data flow: would be very slow, because the statement will be executed for any line in the dataflow
Any ideas?
Best regards,
Stefoon
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May 11, 2005
Hi
I have a fact table in which i have a String column now i want to show it in the mdx queries..when i add it as a measure it shows some numerical values in the cube i cannot even add it as a member propeties due to some datwarehouse design constraints..so can anyone out there help me please....it urgent
Thankx in advance
regards
Hemant
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Dec 6, 2007
I have a cube with 2 fact tables and I would like to create a calculated measure that uses values from both tables like:
fact1.measure1 / fact2.measure2
I can't see how to do this?
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Feb 6, 2008
Hi All,
What is the best way to move data from Online system tro data warehouse?
I have created 3 dimension tables(product,date and customer tables) and
I wanna create fact table and get foreign keys from dimension tables.
What is the best method to do that in SSIS?
thanks
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May 16, 2007
Hi,
I am new at SSIS and I am trying to create a Datawarehouse using SSIS. I have the data files as flat files I have the Dimensional Model ready on Paper and Now I need to use the SSIS for the ETL process.
I am trying to figure out how to make dimension tables in SSIS? I mean I want to create the 5 Dimension tables and then create a Fact table out of it but I cant understand where to start? Can any one tell me how we create Dimesion tables in SSIS. Like one of the dimesion tables I need to create uses 2 flat files and is like a flattened dimension, How would I create this in SSIS?
Even if there is any tutorial which shows this step by step do let me know. I would really appreciate any guidance on this.
Thanks,
Sarang
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Mar 6, 2008
Hi All,
I want you an urgent respones, I want to add a column to a Dim_table and Fact_table, the Dim_table is sourcing from different database table and now the new column is going to source from another DB, thus without changing the structure of the table relationship can i add a column? To make it clear Dim_table has got Clomun1 from table1, Clomun2 from table2, Clomun3 From table3, Clomun4 From table4. Now I want Clomun5 From table5. How do i add and let it source from table5.
Thank you for your qiuck response.
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Oct 12, 2006
Hi,
I have a situation where I have 4 tables:
1. 2 Dimensional tables(Parent), DIM1 with 50000 rows, and DIM2 with 1000 rows
2. Fact 1 with 50 columns, 25 Million rows and with FK to DIM1 and DIM2
3. Fact 2 with 40 columns, and 25 Million rows and with FK to DIM1 & DIM2 tables.
Actually the fact 1 and fact 2 have same related data but since our Analysis cube person wanted the fact table not to have more than 50 columns we divided the tables into 2, but they have the same compound key.
Above said, I have a situation where I have to select all the columns, in both fact tables, and do a group by. I wrote the query and ran "Analyze Query in the Database Engine Tuning Advisor" for it. It gave bunch of recomendations about the statistics and indexes which I created. When I executed the query the result came up in matter of seconds, which was good.
In the query I had a condition having MarketName='Bridgeview' and DateID = 344 (FK of today-1).
When I wanted the data for last 30 days I changed to DateID in ( > FK of today -32 and < FK of today), the query responded and worked fine.
But when I changed the query to get MarketName='Aurora' (other than I used when I ran Tuning Advisor), the result returned is empty set. When I removed the MarketName condition, it is supposed to return all markets' data, but it returns only Bridgeview data.
I know the data is in the table for all markets, since reports are rendered from these fact tables for all of these markets(also ran queries to check the fact table data).
I am unable to point out the reason why the query behaves like this. It responds to the date change, but not to the MarketName change.
I really appreciate if anyone can help me point out the problem.
Thanks,
Venkat
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Nov 21, 2007
Hello,
I have the following Datawarehouse problem (SQL Server 2005 and SSIS 2005):
2 Fact tables and both with some foreign surrogate keys of dimensions (some of them with common dimensions, other with different dimensions).
I have to create another FACT table that is an aggregation and join table between the 2 ones.
How can I do?
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Feb 19, 2007
Hi all,
i have a fact table which loads through package,when
i m trying to load this table by running the package,i m truncating the
fact table and loading the fresh data,instaed of this without
truncating the fact table i have to implement the incremental logic in
this.
For this i can use SCD or Conditional split,but problem
here is i have many source tables to load this fact table,so its
very difficult to trace the changes in different source tables.
can any one help me out in this??????
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Dec 17, 2007
Hi there, my question is really simple. I want to setup an automatic task in SSIS that drops the tables in the target database and substitutes them with tables from the source database. We are talking about two or three dimension tables and one fact table. The dimension tables are pretty small. The fact table will contain, at maximum, 300,000 rows and 12 columns. I do not use delta or flag historisation btw. What tasks in SSIS would you suggest to use?
BTW I'm new to SSIS... ;-) Thanks in advance!
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Sep 22, 2006
Hi ,
I have situation where I get data from SRC Flat file and have to load Dimensional table and also fact table, using same data flow(have no other choice since I have to unpivot some src data). Since I have to load both tables in same data flow, I have to have a way to put load ordering constraint (I know informatica allows that). Does any one have any idea on how this can be done in SSIS?
I would be really grateful.
Thanks
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Jan 19, 2006
Greetings,
Iam new to SQLl2005. Iam using DTS to transfer data from my source to the warehouse. I have a couple of tables in my source whein I have to join these to tables fields and insert the same in teh warehouse fact table. I have used a Join query in my Oledb source component, What other component needs to be used to insert the data into the fact table.
I also need to extract same data with aggregation and insert the same into an another Fact table.
Kindly help.
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Oct 28, 2015
I am modelling cube in SSAS. Cube has around 20 dimensions and 6 fact tables. Some of the dimensions are common among the fact tables. e.g. Time dimension. Fact_PNL has 3 date columns for those we have 3 role playing dimensions in the dimension usages.
Another fact table has 5 date columns for them as well we have separate role playing dimensions in dimension usage tab. We have a common dimension Company which is foreign key in all fact tables. We might need to combine the data from multiple facts to get final output.
Should i create 6 role playing dimension for each of the fact table or use the same dimension for all fact tables?
Role playing dimensions should be created when we have multiple columns pointing to the same dimension ?
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Jun 10, 2014
I created a Fact Table with 3 Keys from dimension tables, like Customer Key, property key and territory key. Since I can ONLY have one Identity key on a table, what do I need to do to avoid populating NULLs on these columns..
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Sep 11, 2015
How do I correctly populate a fact table with the surrogate key from the dimension table?
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Nov 18, 2015
I'm currently setting up a Tabular Model to do some research between several fact tables. Â In this example i have two fact tables (table 1 and table 2)Â which I've created a 1 to 1 relationship on phone number. Â Typically I create a relationship between these tables to find common data between the two. Â However, in this case I am trying to figure out the best way to model the data so that I can easily surface data from one table that does not exist in the other. Â I would liken this to a LEFT JOIN or a WHERE NOT EXISTS in SQL.
Table 1 has all of the data and Table 2 Only has a subset of the data from Table 1. Â What I'm trying to do here is display what attributes in Table 1 may play a part in records not existing in Table 2. What is the best way to model this?
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Oct 19, 2015
I have below tables in my power pivot.Fact 1 & Fact 2 - connected directly to Mainframes - Data is from the same table broken up due to size of the data.Date Table - Relation ship between both the fact tables.How do i create a summary pivot to get the number of tasks that have been completed in each month.
Month  Count
July
August
September
October.
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Oct 26, 2015
Say you have a fact table with a few columns that all reference the same key column in a dimension table, you want to write a view to return the information for those keys?
USE MyTestDB;
GO
SET NOCOUNT ON;
IF OBJECT_ID ('dbo.FactTemp' ,'U') IS NOT NULL
DROP TABLE dbo.FactTemp;
[Code] ....
I'm using very small data at the moment, and the query plan and statistics don't really say which way.
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Oct 23, 2002
In Analysis Services is there a way you can change a private dimension into a shared dimension without having to recreate it
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Dec 5, 2004
Hi,
I need to change the name of some of my Dimensions and in some cases also need to change the name of the levels used in some dimensions....
Is there an easy way to do this or would I have to create my cubes from scratch?
which I really want to avoid :(
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Dec 5, 2004
Hi,
I need to change the name of some of my Dimensions and in some cases also need to change the name of the levels used in some dimensions....
Is there an easy way to do this or would I have to create my cubes from scratch?
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Mar 25, 2004
Hi,
I have noticed the the cubes that we have here use shared dimensions.
For almost all cubes(5-6) there are at least 4-5 common dimensions.
According to what I have been preached so far, the shared dimensions are so that you can reuse them. That is not what is practised here.
for example.
cube1 has somedim1, dim2_c1, dim3_c1...
cube2 has xyzdim1_c2,xyzdim2_c2,dim3_c2..
dim3_c1 and dim3_c2 are the same dimensions, one for each cube.
I don't know if I am missing something. Shouldn't the use the same dimensions? Could there be any reason for this.
pls. advice.
TIA
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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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Mar 8, 2006
Hello,
This is my first task in attempting to populate a fact and dimension table from SSIS.
I have a Fact table Sales and dimension tables Customer and Location. The data I am getting to fill this structure is in one file. where each record contains the sales information as well the customer information and location details on the same row.
I am using the SSIS to fill this structure by using the slowly changing dimension for the Customer dimension.
I am filling the customer dimension by using the slowly changing dimension. If I have 2 records having same BusinessKey but each with a different first name, where first name is set as a changing attribute, it is creating the customer twice in the table. But shouldn't it create one record with the most recent first name? or am I miss using the SCD.
I have another conceptual question, I am not sure which is the best way to fill my fact and dimension. Should I fill the customer and location dimensions first through 2 different loops on the data and then fill the fact table and map to corresponding dimensions? Or should I do like a for each loop on each record and for each record fill the dimensions and fact simultanously?
Thanks in Advance,
Grace
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May 16, 2008
I have a question regarding a proble with two dimensions I built.
The first is named Account and contains approx 40k records. The second dimension is named Contact and contains the emps from the Account dim and contains approx 58k records. In the cube I also have two measures, One is a count of courses a Contact has taken. The second measure is a count of certifications a Contact may have earned.
The Account dim table has an AccountKey primary key and the Contact dim table has a ContactKey primary key and an AccountKey foreign key to the Account table. The key fields are not operational keys. They are surrogates. Both Contact and Account dim tables have as the first 10 or so records values that are used as parent groupings in the Cube dimension. For instance.
key = 1, name value = 'A-C'
Each proceeding value has the parent grouping's key value set as its parentkey.
The fact table contains both the AccountKeys and ContactKeys and an ItemId that corresponds to a specific course or certification. This itemid is used for the measures in the Cube
That's the background... here's my problem.
Using BIDS or Mgmt Studio, whenever I add the root dimAccount level (actual account names) as a row and then add the root Contact level (Contact names) as another row and drill down to a specifc Accounts contacts, everything locks up. I have only one measure in the data pane. The fact table only has about 20k records in it. I would think this should return data instantly. If I browse the cube with any other comination of dimensions besides the Contact and Account dimensions, the cube runs fine. It is just the combination of Account and Contact. I am getting really frustrated as I cannot figure this out.
I am rusty at SSAS so forgive me if I left out any pertinent info.
Thanks in advance for your help.
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Aug 13, 2004
I have a problem where I have 3 three measures in a virtual cube:
"Actual", "Budget" and "Full Year Budget".
The dimensions I have are:
- Account No_ / Name
- Cost Code
- Sub Cost Code
- Time/Dates
- Budget Name
Both "Actual" & "Budget" measures need to be filtered/dimensioned by:
- Account No_ / Name
- Cost Code
- Sub Cost Code
- Time/Dates (exclusive to "Actual", "Budget")
Thus have put these in one cube
AND "Full Year Budget" needs to be filtered/dimensioned by:
- Account No_ / Name
- Cost Code
- Sub Cost Code
- Budget Name (exclusive to "Full Year Budget")
THUS have put this as one cube…
I then created a virtual cube, with the 2 cubes thinking that the dimensions I created in the original cubes would only filter the measures of the original cube measures in the virtual cube. ...BUT all dimension filters in the virtual cube filter all measures in the virtual cube, irrespective of which dimensions were created with the original cubes.
please help!
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