Fixed V Changing V Historical Attribute Conflicts
Aug 14, 2007
We have an issue in a SCD where a number of records may be presented that have changes to their attributes of EVERY type.
Example,
BusinessKey: xxxxxxxx
BuildingTypeId: 7
BusinessUnitHistoryId: 4019
BusinessUnitId: 4019
CurrencyId: 26
DevelopmentTypeId: 14
MarketId: 182
Name: abcdefgh
CurrencyId is a fixed attribute
MarketId & BuildingTypeId and the BusinessUnitId & BusinessUnitHistoryIds are historical attributes
Name is a changing attribute
The behaviour of the ETL seems to suggest that if fixed attribute changes are detected, these rows will error and therefore the changing & historical attributes will NOT be amended during the SCD transformation. Is this correct... as it seems to be what is happening.
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Sep 29, 2006
I have a Slowly changing dimension that I am using to
populate a dimension table. My problem is this when I run the package and
any of the fields are marked as Historical Attributes it will add an additional
row regardless of the fact that the incoming data and the data in the warehouse
match exactly.
I've tried several things to fix this problem but so far none of them have
worked. Some of the things I have tried that haven€™t worked are to match
all the data types (which I have to do anyways) I've tried trimming the
strings, I've also tried adding just one column
I am using a data conversion to convert them from varchar (the source datatype)
to nvarchar(the warehouse datatype)
I'm at a dead end here and don't know where to go any help would be greatly appreciated.
Thanks
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Nov 9, 2007
Odd problem in a Slowly Changing Dimension task.
SS2005 relational table with 20 fields in it, two key.
Flat file has 10 fields in it, the two keys, four I care about, and four I don't. The four I don't are fields in the table that get updated from another feed, and they duplicate that data.
If I set the four I don't care about as fixed attributes and the four I do care about as changing attributes, none of the changing attribute fields in the table get updated. If I set them all as changing attributes, the appropriate fields get updated. However, one of the fields is a "date added" field, and if I make that a changing dimension, that field will always get updated on every record no matter what because the package uses a GETDATE() to set that value.
I'm thinking about just replacing the SCD with a SQL statement, but then I'll have to import the file into a temp table to do the joined update, and I'd rather avoid that and use what SSIS can give me.
Anyone have insight as to why it's not working?
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Apr 27, 2008
I've got a customer who wants reproducible/historical reporting. The problem is that the underlying data changes.
I tried to explain that this can't be done (can it?), but he doesn't
understand.
To illustrate the situation - Let's say a teacher wants to track
spelling test scores for her students.
The below are scores for students A, B, and C (for January, February, March)
A: {70,80,85}
B: {70,65, 80}
C: {100,90,100}
So, I can generate a historical report that charts the class average
and student trend - that's pretty easy.
Now, in April, we find that the school board has mandated that the
British spelling of words is ok, so now the cumulative scores (for
January, February, March, April)
A: {90,80,85,100}
B: {80,65, 80,80}
C: {100,90,100,75}
He wants a report showing the January average as (70+70+100)/3 = 80,
when really it is (90+80+100)/3 = 90.
Now imagine that there are actually thousands of data points changing like this...
Now also imagine that we add and remove students on a regular basis...
He and his office manager get frustrated when I explain that the
reports are not simple - in their mind it is. They have determined
the solution is to get a report writer and buy Crystal Reports...
I've tried to explain that the problem is that the report
specification is unclear (basically - they don't understand what they want). The situation is ok for now, I'm just trying to plan for when they figure out that buying Crystal Reports won't change their situation (except they are done several thousand dollars)...
Any tips?
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Oct 8, 2007
Hi all
Probably not the right forum - pointers would be appreciated - but I'll give it a try anyway:
I'm in the process of designing a relational database to be used in a BI scenario - ie. dimension and fact tables. The data will eventually be used to feed cubes in Analysis services, however end users will probably be allowed to run reports aginst views of the relational database.
I'm currently looking at the employee dimensions and my first try would designate AGE as a SCD Type 2 attribute. As a result every employee gets at least one new record every year as AGE increases. Given that BIRTHDATE is specified should I drop AGE from the tables and recreate it as a computed attribute in database views and/or cubes?
Regards, Steen
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Sep 15, 2015
I am trying to implement Slowly Changing dimension transformation using Merge.Meaning both changing and historic attribute is in place. It seems we can use Update only once in Merge, in our scenario we have to update...When the historic attribute also have changed (To update the row as expired, IsCurrent=0)Also When changing attribute is changed. (Historic attribute is same). This case also we need to use Update. I am using CDC to do this. Updated OUTPUT is moving to a temporary table and using Execute SQL task to get updated.
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Aug 10, 2015
I want to insert attibute att1 in field F1 . Value for this attribute is content of another field in this table (F2).
My query :
update MyTable
set F1.modify
('insert attribute att1 {sql:column("F2")} into (/ROOT/Node1)[1]')
Where F1 Is not null
But I get this error :
XML well-formedness check: Duplicate attribute 'att1'. Rewrite your XQuery so it returns well-formed XML.
How do I check the douplicate attribute ?
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May 16, 2008
HI,
I had to change the key columns of a dimension attribute to fix an error. I did this in BIDS. The change was from a single key column to a composite key column. Now I am getting these error when I process the cube:
Measure group attribute key column x does not match source attribute ..
I looked at the cube XMLA definition under mesaure groups and it still shows a single key column with inherited binding. However, the BIDS does not give me an option correct this in any way. I have had to do this once before and the only option seems to be removing the dimension from the cube and add it back in. But that is very error prone since I lose any specific settings at the cube dimension level not to mention aggregations no longer include the dimension, etc.
Not seeing an alternative, I went through each measure group (I have 7) and changed the key columns manually in the XMLA and saved the cube. This worked, but I don't understand why BIDS automatically doesn't do it.
Is this a flaw in the BIDS or I should be missing something.
thanks
MJ
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Oct 5, 2015
I have a table with 3 columns (ID Int , Name Varchar(25), Course Varchar(20))
My source data looks like below
ID     Name       Course
1Â Â Â Â Â Â Â AÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Java
1Â Â Â Â Â Â Â AÂ Â Â Â Â Â Â Â Â Â Â Â Â Â C++
2Â Â Â Â Â Â Â BÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Java
2Â Â Â Â Â Â Â BÂ Â Â Â Â Â Â Â Â Â Â Â Â Â SQL Server
2Â Â Â Â Â Â Â BÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â .Net
2Â Â Â Â Â Â Â BÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â SAP
3Â Â Â Â Â Â Â CÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Oracle
My Output should look like below...
ID     Name      Course(1)    Course(2)        Course(3)    Course(4) Â
1       A                Java           C++
2       B                Java           SQL Server .Net            SAP
3Â Â Â Â Â Â Â CÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Oracle
Basically need t-sql to Convert non fixed rows to non fixed columns...
Rule: IF each ID and Name have more than 1 course then show it in new columns as course(1) course(2)..Course(n)
Create SQL:
Create table Sample (ID Int null , Name Varchar(25) null, Course Varchar(20) null)
Insert SQL:
INSERT Sample (ID, Name, Course)
         VALUES (1,'A','Java'),
                (1,'A','C++'),
                (2,'B','Java'),
                (2,'B','SQL Server'),
                (2,'B','.Net'),
                (2,'B','SAP'),
                (3,'C','Oracle')
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Sep 19, 2005
Hi Everyone.
I need some advise on how to create a historical database.
What is the best way of doing this? For example, should I create a new row if a column is changed in a row and Time Stamp all record? What happens when I have child tables link to a Header table?
I have been looking on the NET for methods of creating a historical database, but I cant find any.
Thanks in advance
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Mar 13, 2008
Hi,
I have a question about historical table. I have a table in Sql Server that keeps the history of my clients for the last 3 months.
This table has a PK : client_code and rep_date_id. I want to do a query that returns me a client and to extract the date when i inregistreted for the first time.
I think about a cursor, but i don't know how to use it.
My table looks like this structure:
- client_code
-activity_code
-country_code
-district_code
-...
-rep_date_id_n
And I want to return
--activity_code
-country_code
-district_code
-...
-start_date
-current_date
Thanks
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Oct 20, 2005
A general data design question:We have data which changes every week. We had considered seperatinghistorical records and current records into two different tables withthe same columns, but thought it might be simpler to have them alltogether in one table and just add a WeekID int column to indicatewhich week it represents (and perhaps an isCurrent bit column to makequerying easier). We have a number of tables like this, holding weeklydata, and we'll have to query for historical data often, but only backthrough the last year -- we have historical data going back to 1998 orso which we'll rarely if ever look at.Is the all-in-one-table approach better or the seperation of currentand historical data? Will there be a performance hit to organizing datathis way? I don't think the extra columns will make querying too muchmore awkward, but is there anything I'm overlooking in this?Thanks.
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Apr 7, 2008
From what I've read this is called 'slowly changing dimensions'. Bassically the system I'm working on needs to store the history of certain data so that at any time a user can look up an old project and view it exactly as is, even though the associated parts might have had certain changes over time. From what I can tell Type 2 ( current and historical records are stored in the same table) seems to be the most popular. Type 4 (current records in one table and historical records in a seperate history table) seems like it would also work but I've been unable to find any articles comparing the two. Does anybody have any info on the dis/advantages of one v.s. the other?
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May 3, 2004
We have a database that adds over 100,000 records per day. This goes back to 2002 and I only need historical data for 6 months. Presently we can only can delete 1000 row at a time. Is there a faster way of deleting. We seem to continuely run out of disk space. Urgent!!!!!!!!!!!
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Jul 20, 2005
How to build a TRIGGER that copies, all the time, the data from the table onwhich the transaction occurs to the historical table?thanksFernand---Outgoing mail is certified Virus Free.Checked by AVG anti-virus system (http://www.grisoft.com).Version: 6.0.659 / Virus Database: 423 - Release Date: 2004-04-15
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Apr 4, 2007
I have about 45000 records in a CSV file, which I am using as HTTP request parameters to query a website and store some results in a database. This is the kind of application which runs 24/7, so database grows really quickly. Every insert fires up a trigger, which has to look for some old records based on some criteria and modify the last inserted record. My client is crazy about performance on this one and suggested to move the old records into another table, which has exactly the same structure, but would serve as a historical table only (used to generate reports, statistics, etc.), whilst the original table would store only the latest rows (so no more than 45k at a given time, whereas the historical table may grow to millions of records). Is this a good idea? Having the performance in mind and the fact that there's that trigger - it has to run as quickly as possible - I might second that idea. Is it good or bad? What do you think?
I read a similar post here, which mentioned SQL Server 2005 partitioning, I might as well try this, although I never used it before.
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Mar 21, 2006
I have an SCD that contains a historical output path. If I throw dataviewer in the flow before the SCD, I can see that it should trigger a trip down that lane, but its not. In the advanced editor, all looks good. Anything I can check. BTW, the datatype of the fields that should cause the SCD are datetime.
thanks in advance
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Mar 2, 2012
I have DWH where users query on regular basis. I wanted to know what queries they run and which user fired the queries for the last one month or 6 months.
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Apr 24, 2008
Hi,
I have a SQL2005 db for tracking the prices of products at multiple retailers. The basic structure is, 'products' table lists individual products, 'retailer_products' table lists current prices of the products at multiple retailers, and 'price_history' table records when the price of a product changes at any retailer. The prices are checked from each retailer daily, but a row is added to the 'price_history' only when the price at the retailer changes.
Database create script:
http://www.boltfile.com/directdownload/db_create_script.sql
Full database backup:
http://www.boltfile.com/directdownload/database.bak
Database diagram:
http://www.boltfile.com/directdownload/diagram_0.pdf
I have the following query to retrieve the price history of a given product at multiple retailers:
SELECT
price_history.datetimeofchange, retailer.name, price_history.price
FROM
product, retailer, retailer_product, price_history
WHERE
product.id = 'b486ed47-4de4-417d-b77b-89819bc728cd'
AND
retailer_product.retailerid = retailer.id
AND
retailer_product.associatedproductid = product.id
AND
price_history.retailer_productid = retailer_product.id
This gives the following results:
2008-03-08 Example Retailer 22.3
2008-03-28 Example Retailer 11.8
2008-03-30 Example Retailer 22.1
2008-04-01 Example Retailer 11.43
2008-04-03 Example Retailer 11.4
The question(s) I have are how can I:
1 - Get the price of a product at a given retailer at a given date/time
For example, get the price of the product at Retailer 2 on 03/28/2008. Table only contains data for Retailer 1 for this date, the behaviour I want is when there is no data available for the query to find the last data at which there was data from that retailer, and use the price from that point - i.e. so for this example the query should result in 2.3 as the price, given that was the last recorded price change from that retailer (03/08/2008).
2 - Get the average price of a product at a given retailer at a given date/time
In this case we would need to perform (1) across all retailers, then average the results
I'd really appretiate anyone's help on this :)
many thanks in advance,
dg
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Aug 8, 2007
I must be missing something somewhere...
I have a simple table with three fields: ID, LastName, FirstName. The ID is defined as the PK. In the table is a record of "12345, Smith, John". The incoming flat file has a record of "12345, Smith, Johnny".
In the SCD transform, the ID is the business key, and Last Name and First Name are defined as historical attributes.
During the load, the SCD transform correctly sends the data down the right path, but the insert fails with a primary key violation - as I would expect since it's trying to create a new current record.
How do I get around this problem without removing the PK ???
thx
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Feb 17, 2008
I have a database which contains time series data (historical stock prices) which I have to search for patterns on a day to day basis. But searching this historical data for patterns is very time consuming not only in writing the complex t-sql scripts but also executing them.
Table structure for one min data:
[Date] [Time] [Open] [High], [Low], [Close], [Adjusted_Close], [MA], [DI].....
Tick Data:
[Date] [Time] [Trade]
Most time consuming queries are with lots of inner joins. So for example if I have to compare first few mins data then I have to do inner join like:
With IntervalData AS
(
SELECT [Date], Sum(CASE WHEN 1430 = [Time] THEN [PriceRange] END) AS '1430',
Sum(CASE WHEN 1431 = [Time] THEN [PriceRange] END) AS '1431',
Sum(CASE WHEN 1432 = [Time] THEN [PriceRange] END) AS '1432'
FROM [INDU_1] GROUP BY [Date]
)
SELECT [Date] ,[1430], [1431], [1432], [1431] - [1430] As 'Range' from IntervalData
WHERE ([1430] > 0 AND [1431] < 0 AND [1432] < 0) OR ([1430] < 0 AND [1431] > 0 AND [1430] > 0)
------------------------------------------------------------------------
select ind1.[Time], ind1.PriceRange,ind2.[Time], ind2.PriceRange from INDU_1 ind1
INNER JOIN INDU_1 ind2 ON ind1.[Time] = ind2.[Time] - 1 AND ind1.[Date] = ind2.[Date]
where (ind1.[Time] = 2058) AND ((ind1.PriceRange > 0 AND ind2.PriceRange >0) OR (ind2.PriceRange < 0 AND ind1.PriceRange < 0))
ORDER BY ind1.[Date] DESC;
Is there anyway I can use Sql 2005 Data mining models to make this searching faster?
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Mar 28, 2007
What are conflicts from MERGE replication point of view?
------------------------
I think, therefore I am - Rene Descartes
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Jul 10, 2006
I have two tables that are getting conflicts between the subscriber and the publisher, however I am pretty sure we only update these tables at the subscriber.
I have column level tracking turned on.
The tables both have Nonoverlapping, single subscription (3) set for partition options. I wonder does this do any maintenance to the tables?
I have put in place some triggers to audit what makes changes to the data, but won't know until tomorrow, so if there is something that anyone knows about that might help, please let me know.
Thanks
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Aug 2, 2007
I am working on a project, which involves displaying trends of certain aggregate values over time. For example, suppose we want to display how the number of active and inactive users changed over time.
One issue is how to store historical data. First of all, should I create a separate database for each historical snapshot or should I use one database for all snapshots? Second, our database size is a couple of gigabytes and replicating the entire database on a daily basis is not feasible. An alternative solution is to back up aggregate values, but how do I back up results of aggregate queries, where the user can specify a date range in the WHERE-clause? Another solution is to create fact tables from our relational schema and back those up.
Another issue is how to query historical data. Using multiple databases to store historical snapshots makes it harder to query.
As you can see there are several design alternatives and I would like to know how this sort of problem is generally solved in the industry. Does SQL Server provide any support for solving this problem?
Thanks.
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Oct 25, 2005
My application is to capture employee locations.Whenever an employee arrives at a location (whether it is arriving forwork, or at one of the company's other sites) they scan the barcode ontheir employee badge. This writes a record to the tblTSCollected table(DDL and dummy data below).The application needs to be able to display to staff in a control roomthe CURRENT location of each employee.[color=blue]>From the data I've provided, this would be:[/color]EMPLOYEE ID LOCATION CODE963 VB002964 VB003966 VB003968 VB004977 VB001982 VB001Note that, for example, Employee 963 had formerly been at VB001 but wasmore recently logged in at VB002, so therefore the application is notconcerned with the earlier record.What would also be particularly useful would be the NUMBER of staff ateach location - viz.LOCATION CODE NUM STAFFVB001 2VB002 1VB003 2VB004 1Can anyone help?Many thanks in advanceEdwardNOTES ON DDL:THE BARCODE IS CAPTURED BECAUSE THE COMPANY MAY RE-USE BARCODE NUMBERS(WHICH IS DERIVED FROM THE EMPLOYEE PIN), SO THEREFORE THE BARCODECANNOT BE RELIED UPON TO BE UNIQUE.THE COLUMN fldRuleAppliedID IS NULL BECAUSE THAT PARTICULAR ROW HAS NOTBEEN PROCESSED. THERE ARE BUSINESS RULES CONCERNING EMPLOYEE HOURSWHICH OPERATE ON THIS DATA. ONCE A ROW HAS BEEN PROCESSED FORUPLOADING TO THE PAYROLL APPLICATION, THE fldRuleAppliedID COLUMN WILLCONTAIN A VALUE. IN THE PRODUCTION SYSTEM, THEREFORE, ANY SQL ASREQUESTED ABOVE WILL CONTAIN IN ITS WHERE CLAUSE (fldRuleAppliedID IsNULL)if exists (select * from dbo.sysobjects where id =object_id(N'[dbo].[tblTSCollected]') and OBJECTPROPERTY(id,N'IsUserTable') = 1)drop table [dbo].[tblTSCollected]GOCREATE TABLE [dbo].[tblTSCollected] ([fldCollectedID] [int] IDENTITY (1, 1) NOT NULL ,[fldEmployeeID] [int] NULL ,[fldLocationCode] [varchar] (50) COLLATE SQL_Latin1_General_CP1_CI_ASNULL ,[fldTimeStamp] [datetime] NULL ,[fldRuleAppliedID] [int] NULL ,[fldBarCode] [varchar] (50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL) ON [PRIMARY]GOINSERT INTO dbo.tblTSCollected(fldEmployeeID,fldLocationCode,fldTimeStamp,fldBarCode)VALUES (963, 'VB001', '2005-10-18 11:59:27.383', 45480)INSERT INTO dbo.tblTSCollected(fldEmployeeID,fldLocationCode,fldTimeStamp,fldBarCode)VALUES (963, 'VB002', '2005-10-18 12:06:17.833', 45480)INSERT INTO dbo.tblTSCollected(fldEmployeeID,fldLocationCode,fldTimeStamp,fldBarCode)VALUES (964, 'VB001', '2005-10-18 12:56:20.690', 45481)INSERT INTO dbo.tblTSCollected(fldEmployeeID,fldLocationCode,fldTimeStamp,fldBarCode)VALUES (964, 'VB002', '2005-10-18 15:30:35.117', 45481)INSERT INTO dbo.tblTSCollected(fldEmployeeID,fldLocationCode,fldTimeStamp,fldBarCode)VALUES (964, 'VB003', '2005-10-18 16:05:05.880', 45481)INSERT INTO dbo.tblTSCollected(fldEmployeeID,fldLocationCode,fldTimeStamp,fldBarCode)VALUES (966, 'VB001', '2005-10-18 11:52:28.307', 97678)INSERT INTO dbo.tblTSCollected(fldEmployeeID,fldLocationCode,fldTimeStamp,fldBarCode)VALUES (966, 'VB002', '2005-10-18 13:59:34.807', 97678)INSERT INTO dbo.tblTSCollected(fldEmployeeID,fldLocationCode,fldTimeStamp,fldBarCode)VALUES (966, 'VB001', '2005-10-18 14:04:55.820', 97678)INSERT INTO dbo.tblTSCollected(fldEmployeeID,fldLocationCode,fldTimeStamp,fldBarCode)VALUES (966, 'VB003', '2005-10-18 16:10:01.943', 97678)INSERT INTO dbo.tblTSCollected(fldEmployeeID,fldLocationCode,fldTimeStamp,fldBarCode)VALUES (968, 'VB001', '2005-10-18 11:59:34.307', 98374)INSERT INTO dbo.tblTSCollected(fldEmployeeID,fldLocationCode,fldTimeStamp,fldBarCode)VALUES (968, 'VB002', '2005-10-18 12:04:56.037', 98374)INSERT INTO dbo.tblTSCollected(fldEmployeeID,fldLocationCode,fldTimeStamp,fldBarCode)VALUES (968, 'VB004', '2005-10-18 12:10:02.723', 98374)INSERT INTO dbo.tblTSCollected(fldEmployeeID,fldLocationCode,fldTimeStamp,fldBarCode)VALUES (977, 'VB001', '2005-10-18 12:05:06.630', 96879)INSERT INTO dbo.tblTSCollected(fldEmployeeID,fldLocationCode,fldTimeStamp,fldBarCode)VALUES (982, 'VB001', '2005-10-18 12:06:13.787', 96697)
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Aug 17, 2015
Is it possible to design a Cube with a Dimension "DimEmployee" (SCD Type2) and Query the following:Â What "title" had the person "xyz" at time "2015-01-01"? - See Example data on Images.
I have also a DimTime with Day granularity. The DimEmployee is not at day granularity.
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Oct 1, 2007
I have a database on SQL Server 2005 and am using Access 2003 for my front-end. Today, I started having problems with ONE of the tables. I can't make changes - I get the "another user has made changes" and do not have the Save Changes option - only the Copy to Clipboard or Drop Changes options. I can make changes directly to the table using the Management Studio.
I don't know if it's relative, but it happened as I was trying to add an "After Update" event to set a field equal to currentuser().
Do you have any idea what may be happening?
Thanks
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Jun 14, 2006
Can someone who has had direct experience with this tell me exactly what happens when a conflict (updating same record on two nodes at the same time) occurs in a P2P replication topology? Does the Dist. Agent throw an error? More importantly does the replication set continue to replicate the articles after any error occurs?
Thanks,
Derek
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Feb 19, 2007
Can someone answer/point me to an article to handle update conflicts when replicating?
Say for example, you pull down data into your sql everywhere database and start making changes. Before you replicate, changes are made in the master database that conlift with changes you've made. For example, when you pull down your data there was a product with 4 units left. So maybe you place an order for that product for 4 units while offline. However, while you were offline someone else has taken all 4 of those units and when you replicate, you need to throw an error. How do you handle this situation?
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Jun 18, 2007
I'm trying to create a website based on interesting historical facts, Searchable by date. I need each fact entry to have a datetime field in the database, but unfortunately this method only lets me go as far back as the year 1753 (for an inexplicable reason, I can go up to the year 9999).Is there something I'm overlooking here, or did Microsoft goof this one? Will I have to store my dates as 3 separate custom month/day/year fields? If anybody has a solution for this, please let me know (a B.C./A.D enabled solution isn't at all needed, but I'm open to that too).
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Aug 13, 2012
I have a historical table on a dedicated SQL Server (let's call it the reporting db) that is populated every morning with production data that does not already exist. The data in the prod table is purged after 7 days and nothing is ever deleted from the historical table. I have set up the linked server between the two 2008 SQL Servers, but when I try to run this simple query from the reporting DB, it takes more than 5 minutes and still "executing". I eventually have to cancel it:
-- INSERT INTO Temp_Import_historical
SELECT TOP 1 *
FROM [192.168.1.100].ProdDB.dbo.Temp_Import_historical a
WHERE NOT EXISTS (select [Temp_Import_ID] from Temp_Import_historical where a.[Temp_Import_ID] = Temp_Import_historical.[Temp_Import_ID])
I have omitted the INSERT statement on purpose, since I can't even get to output 1 row. Why this is such a resource intensive query?
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Aug 12, 2014
I want to load historical data from an old system into a new one.Thing is, that old system stored dates as Datetime and the new one uses DateTimeOffset.
All data was collected in the same Time Zone... but with the Daylight Saving Time (DST)
The offset is either +04:00 or +05:00, based on the calendar date. To add to the complexity, the rules for DST changed a couple of years ago.
To determine the offset, I'd need to know what was or would have been the server Timezone for each historical date.
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Aug 13, 2014
Recently, I partitioned one of my largest tables into multiple monthly field groups. For the current month, it is attached to my "Active' table. The older records are kept in the "historical" table. I need an efficient way to pull records when have a date range that can be spread across both tables.
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