Instances And History In One Table

Jan 11, 2008

I have a database design question. There're lots of ways to rome they say, and I want to hear what you think of this way.

Government supplies wheel chairs (and thinks alike) to people who need them. They stay in possesion of the (local) government and are distrubuted by a company X.

So we have Tools (Wheelchairs) and Users (of wheel chairs). The life-cycle of a wheel chair is that more than one user while use it over time.

I want to keep track of which users used a instance of a wheelchair.

No there's a developer who likes to put this in one table. (the chair and it's user) in a way like this


UID, WheelChairId, UserId, OwnerId, SerialNumber, BeginDateTime, EndDateTime, SomeOtherColumns

The UID is unique, the WheelChairId is a GUID which is Unique per wheelchair, but can have mutliple records in the table with no overlap.

If one of the values of the columns is changed a new record is made with the same wheelchair and a new begin date (the closed record gets an Enddate). So history is made automaticaly. By using the right query's I can see what users uses the chair in what period of time. But also changed ownerships and other changes in Someother columns overtime.

Is this a good or a common practice? Why use it, or stay away from it?

Henri
~~~~
There's no place like 127.0.0.1

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Generating User Instances In Sql Server Is Disabled. Use Sp_configure User Instances Enabled To Generate User Instances.

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 When I am in Visual Studio 2005, and I try to add an SQL database, I get the following error "generating user instances in sql server is disabled. use sp_configure user instances enabled to generate user instances." I am currently using SQL server 2005 Express. What do I need to do, to create an SQL database? Thanks in advance. 

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Common Need: History Table

Jan 22, 2008

Hi there!

I'm working on an application designed like this:
There's a table "DailyTransations" (DT) containing daily transactions...
Then there's an archive table "TransationsArchive" (TA) with the exact same structure.

When a record is inserted in DT, it is also in TA (via a trigger) and the reporting is done against TA.
Now for performance issues, we delete from DT the records older than 2 days since they are not needed for processing.

First, what do you think of that implementation?

We thought about using partitions based on the transaction date and completely eliminate TA, but it seems once a record is assigned to a partition, it is not moved automatically...

What is the common solution for this need?

Thanks
Frantz

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History Table Design Issue

Nov 15, 2007

Hi all,
 this is more of a design issue for a History table.
Suppose if i have a transaction table and then based on the transactions i want to keep a history of those do i need to define Primary Key and Foreign Key for history table.
Regards,
General Problem

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Feb 8, 2007

I am running a website of crossword puzzle and Sudoku games. The website is designed to be:
There are 20-30 games onlines each day.
Every registered user could play and submit the game to win scores.
For each game, every registered user could get the score for ONLY one time. i.e., No score will be calculated if the user had finished the game before.
To avoid wasting time on a game finished before, user will be notified with hint message in the page when enter a already finished game.


The current solution is:
3 tables are designed for the functions mentioned above.
Table A: UserTable --storing usering information, userid
Table B: GameList --storing all the game information.
Related fields:
GameID primary key
FinshiedTimes recording how many times the game has been finished
Table C: FinishHistory --storing who and when finished the game
Related fields:
GameID ID of the game
UserID ID of the user
FinishedDate the time when the game was finshied

PS: Fields listed above are only related ones, not the complete structure.

Each time when user enters the game, the program will read Table B(GameList), listing all the available game and the times games have been finished. User could then choose a desired game to play.

When user clicks the link and enter a page showing the detail content of the game, the program will read Table C(FinishHistory) to check whether user has finished this game before. If yes, hint message will be shown in the page.

When user finishes the game and submit, the program will again read Table C(FinishHistory) to check whether user has finished this game before. If yes, hint message will be shown in the page. If no, user will get the score.

Existing Problems:
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Does any one here have any good suggestions to change / re-invent a new structure or design to avoid this bottleneck?

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how to get products on which SalesPerson changed. Here is table with data.

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Nov 3, 2015

I have order history table that tracks who worked on a order

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2. Work. 7666
3. Return. 6789
4. Work. Null Role1
5. Return. 6538

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I have order history table that tracks who worked on a order

Another example

ID. ColA. ColB. ColC
1. Work. 1234
2. Process. 7666
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I want a query to return most recent colB or ColC where colB or ColC are not null. In this case row 2

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May 21, 2008

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For stage codes they basically follow something like application, guidance interview, programme area interview, conditional/ unconditional offer... Although they could skip a stage code.

Any ideas how to do this bearing in mind I can't guarantee them to go to every stage so really I need to look in the history table and find records more than x days apart where one is the next progression date of the other. Hope I explained that ok.

history table is similar to:

StudentID CourseCode StageDate InputDate Stage

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May 23, 2008

Hello,
I am using SQL Server 2005 and am having trouble with making a history table like mentioned in my earlier thread:

http://www.sqlteam.com/forums/topic.asp?TOPIC_ID=102811

This is the table "People" I have created:

|PersonId (PK)|DateFrom (PK)|DateTo|PersonName|Other Attributes....

Each change to a person's attributes results in a new row formed with the same PersonId as in the row with old attributes and the Date these new attributes are valid (DateFrom). So as shown above the Primary Key is a combination of the PersonId and DateFrom as a change to a person's attributes should never happen at the same time twice.

My problem is when I want to create a new person, how do I get a new unique id? Ideally I want the a new incremented id, so that all peoples' ids are in a sequential order.

As always, thanks for the help!

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Hi guys,

acutally i have setup a Disaster Recovery plan for my database.. i m taking a full back once in a week,. i dont' know when i right click on the job and trying to check the view history option to check when was last backup has been taken, it's showing nothing..but when i check on acutall location the backup was taken there.. i don't know y it's not writing any info in view history table.. or is it clear once in a week and i cann't see that...

Can any one tell's me about this...

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I searched a lot but could not find something similar in my opinion need SP for it.

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Jan 26, 2015

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Here is example.

Process table

PK, processid, status , other data
1, 1, 1,...
2, 1, 2,...
3, 2, 1,...
4, 3, 1,...

ProcessChild table

PK, processid, processchildid status, other data
1, 1, 1, 1,..
2, 1, 1, 2,..
3, 1, 2, 1,...
4, 1, 2, 2,...
5, 2, 1, 1,..
6, 2, 1, 2,...
7, 2, 2, 1,...
8, 3, 1, 1,..

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I have a history table with the following values

CREATE TABLE History (SnapShotDate DATETIME, UID VARCHAR(10), DUEDATE DATETIME)

INSERT INTO History VALUES ('03-23-2015','PT-01','2015-04-22')
INSERT INTO History VALUES ('03-30-2015','PT-01','2015-04-20')
INSERT INTO History VALUES ('04-06-2015','PT-01','2015-06-30')

[Code] ....

I need an output in the below format. I need the most recent changed value for any given UID. Need to get the below result

OUTPUT
UID PreviousDueDate CurrentDueDate
----------------------------------------
PT-01 2015-04-20 2015-06-30
PT-02 2015-04-22 2015-04-22
PT-03 2015-04-18 2015-04-22
PT-042015-04-222015-04-18

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Jun 27, 2014

I have a table history of Employee data.

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Hi All,

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Thanks in advance : )

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Hi everyone,
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date ID A B C D
1/1/65 X Null Null Null Null
1/4/65 X 1 2 3 4
...
2/25/05 X 2 3 4 5
1/1/65 Y Null Null Null Null
1/4/65 Y Null Null Null Null
...
2/25/05 Y 2 3 4 5
...

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Mar 5, 2008



Given the following data how do I make a SQL query that returns only 1 row per product?

The returned rows need consist of only currently active products (that is WHERE (DateEffective <= { fn NOW() }).
The twist: Sometimes a product will have duplicate DateEffective records. In that case, only return the record created latest because that's the most current data that exists for a product. RowTimeStap is when the record was created.


Example Data:
HistoryID ProductID Name Color DateEffective RowTimeStamp
(auto-number PK)
1 1 Wheel Red 2/1/2008 2/1/2008
2 1 Wheel Blue 3/5/2008 3/1/2008
3 1 Wheel Orange 3/5/2008 3/2/2008
4 1 Wheel Black 1/1/2010 3/3/2008
5 2 Knob Blue 3/2/2008 3/2/2008
6 2 Knob Green 3/3/2008 3/3/2008

Query should return:
3 1 Wheel Orange 3/5/2008 3/2/2008
5 2 Knob Green 3/3/2008 3/3/2008


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Nov 19, 2007

Let's say you have a Users table, which simply contains a collection of people. Each person has attributes like their password, first and last name, username, etc. It would be useful to track changes to that table over time, so that if an entry is changed, you can simply look at a history table and see which changes occured, and when.

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Thanks,
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Jun 30, 2015

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Nov 5, 2007



Hi

Please help! I'm really stuck. I have a table (AssessorAllocations) that stores the data of students who have submitted assessments for marking by an Assessor. Each time an assessment is submitted by a student my program must determine which Assessor has the smallest workload and then assign the current assessment to that Assessor. My problem is how do I determine which Assessor has the smallest number of assessments assigned to him/her.

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DateMarked
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Feb 9, 2007

Hi,

My scenario:

I have a master securities table which has 7 fields. As a part of the daily process I am uploading flat files into database tables. The flat files contains the master(static) security data as well as the analytics(transaction) data. I need to

1) separate the master (static) data from the flat files,

2) check whether that data is present in the master table, if not then insert that data into the master table

3) If data present then move that existing record to an history table and then update the main master table.

All the 7 fields need to be checked to uniquely identify a single record in the master table.

How can this be done? Whether we can us a combination of data flow items or write a sql procedure to do all this.

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Givens: All SQL Server 2008 or 2012 tools at your disposal.

Production database contains the following tables (simplified for example: constraints ignored, etc.) associated with a racing video game’s server.

-- A player of our game

-- Table greater than 10 million rows

CREATE
TABLE [dbo].[User]
(
[UserId]              
[bigint] NOT
NULL  
,[country]             
[int] NULL   
-- User’s home country
,[name]                
[nvarchar](15)
NULL  -- User’s displayable name (‘John’, ‘Bill’)
,[subscriptionTier]    
[int] NULL
)
-- 0 == free, 1 == paid, for instance

Assume that rows get written into the event tables at a rate of 1,000 a minute,are never updated once written and currently are only read on a replica/reporting server.

Question Background: Write up a single query that would return the following: List of users and whose “TotalMoneyEarned” value ever grew (between logon events) at a rate of more than 1,000 per minute (we’d consider these suspicious and flag them for later investigation). 

For instance, if the sample data were:

-- example of [Events.UserLogon] data  -- not the query output we want

EventId     UserId               TotalMoneyEarned LogonDate
----------- -------------------- ---------------- -----------------------
1           1               1000             2010-10-16 00:19:56.460
2           1               1500             2010-10-16 00:20:56.460
3           1               3000             2010-10-16 00:21:56.460
4           1               10000            2010-10-16 00:29:56.460

Event 1 is okay because there’s nothing to compare it against

Event 2 is okay because the TotalMoneyEarned only grew 500 in a minute

Event 3 should be flagged, as the value grew 1500 in a minute

Event 4 is okay, as it grew 7,000 in 8 minutes (< 1000 per minute)

Query Output (your query should return data in a format like this):

User      Flagged Logon Time    Rate Since Last Logon (money/minute)
John      2010-10-16 00:21:56   1500
Dave      2010-10-16 00:30:50   3200
Bill      2010-10-16 00:35:23   1000

It is likely that you will need to create sample data for both the User and [Events.Logon] tables.  We are looking for a single query that returns data like what is represented in Query Output.

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