Composing A Reference From Fields Located In Mutiple Tables
Jun 12, 2007
Consider a situation. There is a table of submitted 'documents'. They have some attributes. There are assignments to process the things, which have a date they were created. Finally there is a price list which specifies the price according to document features and date, so that the assignment to process a document created at different time will have a different cost. In other words, there is a relation
(assignment->document.attribute(s) + assignment.date) -> pricelist.price
Creating relations has the integrity advantages: it is not possible to create an assignment, which price is not defined in the pricelist; precludes the pricelist entry removal if it is referred by any assignments.
Should a view, which combines all the foreign fields into one virtual table, be created to make establishing the reference possible?
Not sure if the title describes my situation or not.
Simplified example is: I have an [Employee] table with EmpCode, EmpName
I have a second table [NewHires] that has: HireDate, EmpCode, Addedby
Both EmpCode and Addedby contain EmpCode referring to the Employee table.
I wish an output similar to:
New Employee (from EmpCode in NewHire), Hired on (From HireDate), Hired By (from Addedby)
My problem is with an Employee.EmpCode=NewHires.Empcode or Employee.EmpCode=NewHires.Addedby in the Where clause or Join part of the SQL I don't know how to get EmpName from the Employee table twice but using two different EmpCode as the reference.
Firstly thanks a lot Phil and Jamie on such a helpful article on "Checking to see if a record exists and if so update else insert"
Here is my question
I have about 10 tables and there respective working tables For examples: A, B, C, D, E.... and WorkA, WorkB, WorkC....
Notes: 1) When I execute a package these work table (Work A, WorkB ...) get populated with certain rows say about 5 2) Its not that all the work table are populated on every execution. 3) Tables A, B, C... have thousands of records in it. 4) Work table is of same structure as there parent table..Like WorkA same structure as A..... 5) The table A and WorkA and as on... are linked with a KeyID
Now I want to build a SSIS package that can 1) Get the the data from these multiple tables(WorkA, WorkB...) 2) Process each row of these tables WorkA, WorkB.. 3) Depending upon the KEYID of WorkA., WorkB.. etc Update a Flag colunm of table A, B...where the KeyID is equal to KeyID of Work Table 4) After updating insert that processed row of Work A, WorkB ...into Table A, B..
I can do this if I have one source table and one destination table. Here i have some say 10 randomly source tables to respective random destination . All I could think of creating 10 different packages as adviced in Jamie's article. But I am sure there might some other alternative.
Can somebody advice me the best practice of doing this. Thanks a lot in advance
I have a lookup table called States, I have multiple other tables that use this lookup table, but I can only relate to one other table. My question is if I change a state name how do I enforce that change to the other tables that CANT be related? I know it is a design flaw and need some kind of joining table. I am having difficulty understanding and incorporating first normal form in my database. Here is what i have so far.
I would like to know if is possible copy data from a database located in my hosting to my database located in my pc,but using a store procedure,how can i do that ?.What tool i have to use?
Hi all, I have a ranking system where I wish to update the ranking every time a result is reported. Performance is no issue what-so-ever. More specifically, two players are to devide their points after each series of games to reflect the fraction of over-all games that each player have won. I've written the trigger below, but Visual Web Developer 2005 Express (SQL Server 2005 Express) complains about the references to the 'inserted'-table. I find it very difficult to transform the code below to something that looks like the examples found in documentation. Could someone get me started in the right direction? Thanks in advance, Anders create trigger result_insert on result after insert as begin declare @won1 as int declare @won2 as int declare @oldRank1 as float declare @oldRank2 as float declare @oldranksum as float
select @won1 = sum(wongames1) from result where player1 = inserted.player1 and player2=inserted.player2 select @won2 = sum(wongames2) from result where player1 = inserted.player1 and player2=inserted.player2
select @oldrank1 = Rank from RankingInfo where memberid = inserted.playerid1 select @oldrank2 = Rank from RankingInfo where memberid = inserted.playerid2
set @oldranksum = @oldrank1 + @oldrank2
update rankingInfo set Rank = @won1 / ( @won1+@won2) * @oldranksum where memberid = inserted.player1 update rankingInfo set Rank = @won2 / ( @won1+@won2) * @oldranksum where memberid = inserted.player2
I need a table of seasonally adjusted forecasts. Each row contains 52 weekly values to been named as needed (e.g. Week01, Week02, etc.). At any point in the year, I want to be able to determine how many weeks I can cover with the product on hand.
I have not been able to envision a set based, normalized solution given there are nearly a million items to be evaluated daily. If I normalize, I'm faced with 52 million rows. It seems to me I'm better off bringing a wide row containing all 52 week buckets into memory and working with them in a stored procedure. And if that's the best solution, how do I reference these "virtual" buckets? I'm thinking of some kind of While() loop that counts the weeks until the inventory is exhaused but I need a subscript based technique to reference each week.
Hi! Probably answer on this question exists already on this forum but i can't find it.
I have table with two foreign keys (ID1 and ID2) and date. Date can't be primary key because it wouldn't be unique so i must create PK from those three things.
I have a simple query which displays items from inventory with their latest annual test date. I want to create another unique reference in my results to use as a certificate number. The number should be a combination of the item+month+year from the test date. What is the easiest way to accomplish this?
My query and my desired results are below:
select item, test_date from inventory where cat = 'TELE' and itemised_status > 15
How can I create a Table whose one field will be 'tableid INT IDENTITY(1,1)' and other fields will be the fields from the table "ashu". can this be possible in SQL Server without explicitly writing the"ashu" table's fields name.
I have facing a design problem and unable to justify which design to choose for my data model.
Usually, what we have is like data tables and reference tables to store data in those data tables. My database has tables with 20-30 columns in them. And most of them (though not all of them), stores data from some reference tables. Meaning each column has an associated reference table where it stores possible list of values for that particular column. Sort of data domain for that column. FYI, My database is related to medical field.
For example, A table that has a varchar(40) column called "Differentiation". It can only store values from following list: - Undifferentiated - Moderate - Poor - Poor - Moderate - Moderate - well
Now, to implement this, simple solution would be to have a reference table where I can store all these possible values...And then have just a reference of each data item into my "Differentiation" column in the table.
This is simplest and probably the best solution for such thing and i can also have referential integrity implemented for this.
But now if we look at the bigger picture, my database is growing and I have about 80 tables which I need to create where most of the columns will have different reference tables like I mentioned above. Approximate number of reference tables is 300 tables. All the reference table will have same structure, with different values for different columns.
Now, what seems to me is, because the table structure is same for every column, rather than having 300 different tables, I can only have 2 tables, where I can put all these reference values into these 2 tables. Like, Table 1 : This table can have name of the reference table like "differentiationlist" etc.
Table 2:
It has reference to the reference table list in Table 1 discussed above and all the values that are part of that reference table can go in this table with its reference.
But problem with this is, because all the reference tables are in these two tables, I don't know how to implement referential integrity in this design.
Does anyone have any idea or solution for situation like this?
I have two tables that are reference to each other by foreign key, now I would like to alter the table so the it doesn't reference each other any more. What is the syntax to alter a table so that the fk field doesn't reference a table anymore. Thanks in advance for the help.
Now i have a reauirement to build a stored proc in which all the transactions starting from one transaction like, if i want to know the chain for item no 2 it shall give the following result:
24 43 37
if i want to know the chain for item no 3 then it shall give following 37
if i want to know the chain for item no 1 then it shall give following 12 24 43 37
I'm trying to create two tables, Admins and SecurityGroups, I want to have the ability to assign a security group to an admin so that I don't have to specify all the rights individually to every admin. So, I have the securityGroupID in the Admins table and I reference the SecurityGroups table for data integrity. On the other hand, for audit purposes, I also want to record which admin created the security group so I have the AdminID in the SecurityGroups table and I reference the Admins table for data integrity. Of course when I try to create any of those tables I get an error message that the other table doesn't exist. I wonder if this can be done without having to remove the references constraint from one of the tables and then using alter table. Here's an example below to make it clearer:
CREATE TABLE Admins ( AdminID INT NOT NULL PRIMARY KEY, SecurityGroup NULL REFERENCES SecurityGroups (SecurityGroupID) )
CREATE TABLE SecurityGroups ( SecurityGroupID INT NOT NULL PRIMARY KEY, CreatedBy INT NOT NULL REFERENCES Admins (AdminID) )
Hi, I don't know if this is possible, i believe not, so I'm here to ask the experts if is possible to have a foreign key constraint that references the key of one of two tables. Like this: I have 3 tables: TABLE X, TABLE A and TABLE B Is it possible to the FK on TABLE X refernce the PK of TABLE A OR TABLE B? If yes, how can I do this? If not, I need to have a fourth table, so TABLE X references TABLE A and TABLE Y references TABLE B. Thanks!
I am using vs 2010 to write my dtsx import scripts.I use a script component as a source to create a flat file destination file.Everything have been working fine,but then my development machine crashed and we have to install everything again.Now when i use the execute package utility to test my scripts i get the following error:
Error system.NullReferenceException: Object refrence not set to an instance reference.
In PreExecute section TextReader = new system.io.streamreader(" file name") In the CreateNewOutputRows: dim nextLine as string nextLine = textReader.ReadLine
[code]...
is there something which i did not install or what can be the error?
I'm not sure how easy of a task this is, or how to go about it, so I thought I'd ask here. I am doing a major overhaul to my site and am re-programming the backend which involves re-formatting my tables, table names etc.
What I want to do is set up a new table in the format I want for the new site, but still be able to have the live data that is being submitted to the site now, be entered into the new table so that I don't have to shut down the site for days to transfer and reformat data. Example
CURRENT SITE
Table 1 Field1: Name Field2: Address
NEW SITE
Table 1 Field1: Name Field2: myAddress Field3: City
I want to be able to somehow map the two together so that when data is entered into the Name field on the current site, that same name is also inserted into the new site table as well. Mapping like this:
(current site)Name -> (new site)Name (current site)Address -> (new site)myAddress
The city field would be left unaffected as that data would only be entered once the new site is up and running.
I know I could do this from a stored procedure on the exiting site or by re-writting all of my SQL to insert into both tables, but right now all of the SQL is hardcoded into the pages and I have A LOT of pages. Is there a way to map the tables together from within SQL Server?
I need to get the names of tables and fields (or atleast the fields) from a database. Is there a query I can use that will return what all the db's tables and those tables fields are?
I have a database with approx 95 tables. I would like to get a printout of each table, the fields contained therein and the field type (i.e the information displayed when rightclicking a table in Enterprise Manager and selecting Properties).
I have tried to use the diagram function but due to the large number of tables the diagram is very complex and would have to be printed out on a huge sheet of paper to make it legible. I have also looked at the SP_HELP stored procedure but can't seem to get the syntax correct to display properties on all tables (info on one table is no problem).
I am working with the article that MAK wrote on SecurityLogs http://www.databasejournal.com/features/mssql/article.php/3515886
I have completed this, but I have made some changes to the database (for normalization to 3NF purposes). I now have problems with a query.
I am trying to "Insert a new record in a table if it does not already exist in the table". To try to clarify I perform the following query:
INSERT INTO Tmp_Event SELECT DISTINCT EventID, EventType, EventTypeName from Tmp
Which gives me the Tmp_Event table consisting of EventID's etc. (no duplicates). What I then want to do, is compare the 'Tmp_event' table and an already existing 'Event' table. These two tables are in fact identical. I would like to insert any records from 'Tmp_Event' into 'Event' if they do not already exist in 'Event'.
This query gives me all records that do not exist in 'Event'
SELECT EventID, EventType, EventTYpeName from Tmp_Event WHERE EventID NOT IN (SELECT EventID from Event)
How can I change this query into performing an INSERT INTO Event as well?
If possible, I would like to create a view using two different tables, but with the fields merged (ie. create one table from two tables). The table structures are pretty much the same. Can you do this from a singe SQL statement? Any ideas? My only alternative is creating a temp file that inserts records from both tables, but I want to avoid doing that.
There are more than hundred tables, so i wanna automate this. i am tryin to do this in a cursor: please guide!
declare @name VARCHAR (50) declare cur cursor fast_forward for select name from sysobjects where type='u' and status not like '-%' open cur WHILE (1=1) BEGIN FETCH NEXT FROM cur INTO @name IF @@fetch_status = 0 BEGIN ALTER TABLE @name ADD created_by [VARCHAR] (25) GO ALTER TABLE @name ADD created_by [VARCHAR] (25) GO ALTER TABLE @name ADD created_date [DATETIME] GO ALTER TABLE @name ADD modified_by [VARCHAR] (25) GO ALTER TABLE @name ADD modified_date [DATETIME] END ELSE BREAK END DEALLOCATE cur
I also want that if one column for a table exists; the other columns should be created rather than it quits.
For example, I have 2 tables that have very similar fields
Table 1 Table 2 ShipRpt ShipRpt invoice invoice total sold total sold
Is it possible to compare each of these fields and return any record that has non matching data? I would join the tables on the shipping report or invoice and only compare the total sold field. If the invoices match and the total sold is different in each table, can I just return the 1 record?
I am using a hosted MSSQL 2000 database that powers the backend of mywebsite. Website visitors interact with it via ASP pages I havedeveloped. I also have an internal FileMaker 7 database thatperiodically synchs with it via Filemaker's ODBC functionality.Several times now, I have come in one day to discover that my ASP pagesdon't work. When I look into it, one of my MSSQL tables will be missinga few fields. There is nothing in any of my code that sends an ALTERTABLE command or any other command that affects table structure. Thesedeletions of fields is totally random.The most recent example was with a table called FreeTeacherSubs. I justdiscovered today that three fields went missing:HowDidYouHearAboutYES TEXTFollowUpCallOrEmail TEXTHowMaterialsFit TEXTSuffice to say I am baffled! Has anyone ever experienced fieldsdisappearing from their tables?Kevin
I feel sure that this is a very naive question, but it is freeky me out that I can solve it. With SQL server what is the easiest way to make a field other than the Primary key unique?Would appreciate help with this. ThanksPaul
Hi there, I have a fairly generic question regarding database design. I am working on my first database using SQL Express. I am testing the database by inserting records into the pre defined tables. Sometimes I forget to input text into a non null field. When this happens it displays an error and then skips a few rows which makes my row numbering messy. For example say I have Row 1, Row 2 Row 3 all nicely formatted but on Row 4 I make a mistake this row then disapears and their is gap between 3 and 5 where 4 was. Although I am just testing, I was wondering what happens in a real scenario if an inexperienced data input person makes a few mistakes it makes the database numbering systems look bad. In this case is it common to make most fields NULL to allow for admin errors??
Im writing a program in ASP language which it is using SQL Server for database.
I want to know how to create a link between fields of two tables. For example: I have a table named: Projects containing: p_name status date member1 member2
and another table named results containing: p_name s_status status1 status2
I want to create a link between field s_status of STATUS table and field status of table Projects
Users are sending data to table projects, when a user send some data to status of projects, I want this link to send data from status in project to s_status of results.
Question.I have a new table that I am adding to a script that I wrote. Thistable has 3 fields, the first 2 fields are used in the on statement asbeing = other fields in the script.The first field always has data in it, but the 2nd field is sometimesnull.So my problem is if both fields have data in them and they both matchto the data in the fields that I am linking them to, then it returnsthe 3rd field without a problem. However if the 2nd field is null thenit is returning a null for the 3rd field. I have checked and the fieldthat I am linking to is null also.So if I haveselect t1.field1, t1.field2, t2.field1, t2.field2, t2.field3from table1 t1join table2 t2on t1.field1=t2.field1 and t1.field2=t2.field2with 2 records in each tabletable1: record1: data, datarecord2: data, nulltable2: record1: data,data,datarecord2: data,null,datawhat I get from the script isrecord1: data, data,data,data,datarecord2: data,null,data,null,nullI would expectrecord2: data,null,data,null,dataI hope this makes sense, I didn't want to post the entire actual scriptas it is about 150 lines long.Thanks in advance.
