I am trying to create a FK using a composite PK and here are the details that I want to achieve.
Table -A
Column A1 not null,
Column A2 not null
Primary key (A1, A2).
Table -B
Column B1 Primary key.
Column B2 not null
FK (B2) References A(A1).
When I try to do this I am getting some errors. Questions: First of all is this possible? if yes, then how I can create it.
Hi,
In my table1, I have a composite primary key ssn+firstname+lastname.
In table2 I have ssn, firstname, lastname, col1. In table2 I want to create a foreign key which references table1 primary key?
table1 and table2 has the primary, foreign key relationships. Still table2 need primary key. In table2 Can I make the ssn+Firstname+Lastname as primary key? or one column id as auto increment?
Which is best way?
Thanks
I have two tables: table 1 and table 2. The primary key of table is composite key of two collumns and table 2 is the child of parent table 1. Is it possible to create / define a foreign key constraint using a composite primary key?
View 10 Replies View RelatedHi,
I have a doubt, can anyone please clarify me.
I have created the following table,
create table z
(
eno int,
deptno char(2),
ename varchar(5),
constraint pk_eno_deptno primary Key(eno,deptno)
)
and I tried to establish a foreign key based on the above defined table. It's giving error,
create table z_dup
(
eno int FOREIGN KEY REFERENCES z(eno),
deptno char(2)
)
go
Error:-
*****
There are no primary or candidate keys in the referenced table 'z' that match the referencing column list in the foreign key 'FK__z_dup__eno__18CE1BA6'.Could not create constraint. See previous errors.
Even I tried to create a foreign key like the following,
create table z_dup
(
eno int FOREIGN KEY REFERENCES z(eno,deptno),
deptno char(2)
)
go
Error:-
********
More than one key specified in column level FOREIGN KEY constraint, table 'z_dup'.
Can anyone please help me to create a foreign key relation with the base table.
tks in advance,
Srinivasan
Hi All
I hope someone smart can help me, it would be highly appriciated.
I am developing an SQL Serverdatabase and in on of the tables I need the primary key to consist of two pieces of data.
TblOrders: OrderNum, Orderdate, ....
TblDispatchers: DispatcerID, Dispatcher, DispatcherAddress
The OrderNum field in TblOrders need to be a composite of an AutoNum-field (incrementet by 1) and the DispatcerID from the tblDispatchers.
Can this be done, and how.
Many thanks
Kind regards
Tina
Hello,
I have a table which has a composite primary key consisting of four columns, one of them being a datetime called Day.
The nice thing afaik with this composite key is that it prevents duplicate entries in the table for any given day. But the problem is probably two-fold
1. multiple columns need to be used for joins and I think this might degrade performance?
2. in client applications such as asp.net these primary keys must be sent in the query string and the query string becomes long and a little bit unmanagable.
A possible solutions I'm thinking of is dropping the existing primary key and creating a new identity column and a composite unique index on the columns from the existing composite key.
I would like to have some tips, recommendations and alternatives for what I should do in this case.
I want to create a table with primary key , and put relationship with second table.
View 5 Replies View RelatedUma writes "Hi Dear,
I have A Table , Which Primary key consists of 6 columns.
total Number of Columns in the table are 16. Now i Want to Convert my Composite Primary key into simple primary key.there are already 2200 records in the table and no referential integrity (foriegn key ) exist.
may i convert Composite Primary key into simple primary key in thr table like this.
Thanks,
Uma"
Hi all,
I use the following 3 sets of sql code in SQL Server Management Studio Express (SSMSE) to import the csv data/files to 3 dbo.Tables via CREATE TABLE & BUKL INSERT operations:
-- ImportCSVprojects.sql --
USE ChemDatabase
GO
CREATE TABLE Projects
(
ProjectID int,
ProjectName nvarchar(25),
LabName nvarchar(25)
);
BULK INSERT dbo.Projects
FROM 'c:myfileProjects.csv'
WITH
(
FIELDTERMINATOR = ',',
ROWTERMINATOR = ''
)
GO
=======================================
-- ImportCSVsamples.sql --
USE ChemDatabase
GO
CREATE TABLE Samples
(
SampleID int,
SampleName nvarchar(25),
Matrix nvarchar(25),
SampleType nvarchar(25),
ChemGroup nvarchar(25),
ProjectID int
);
BULK INSERT dbo.Samples
FROM 'c:myfileSamples.csv'
WITH
(
FIELDTERMINATOR = ',',
ROWTERMINATOR = ''
)
GO
=========================================
-- ImportCSVtestResult.sql --
USE ChemDatabase
GO
CREATE TABLE TestResults
(
AnalyteID int,
AnalyteName nvarchar(25),
Result decimal(9,3),
UnitForConc nvarchar(25),
SampleID int
);
BULK INSERT dbo.TestResults
FROM 'c:myfileLabTests.csv'
WITH
(
FIELDTERMINATOR = ',',
ROWTERMINATOR = ''
)
GO
========================================
The 3 csv files were successfully imported into the ChemDatabase of my SSMSE.
2 questions to ask:
(1) How can I designate the Primary and Foreign Keys to these 3 dbo Tables?
Should I do this "designate" thing after the 3 dbo Tables are done or during the "Importing" period?
(2) How can I set up the relationships among these 3 dbo Tables?
Please help and advise.
Thanks in advance,
Scott Chang
Hi.
Could somebody please explain to me how to create a foreign key from a table that
has two composite keys? I have a table, UserPrecedence, with two composite keys -
up_owner, owner_userID. I have a second table, Users, that has the primary key
"emailAddress" and a userID table to which all other tables point their FK columns.
http://i103.photobucket.com/albums/m156/pbd22/Keys.jpg
I want the userID column in Users to be the FK of the owner_userID column in UserPrecedence
but the Modify Table view complains that "both sides of the relationship must have the
same number of columns" when I try to create the relationship.
I am guessing this is because its a composite primary key. Can somebody explain
to me how this is done correctly (and why)?
I appreciate your help.
Thanks.
WHile designing a Database should one go for composite Primary Keys.
Or what are the Pros and Corns of Composite Primary Keys
Thanx
I've been facing this situation since long but today i am asking here. Suppose i have a following tables;
AdmissionInfo, AdmID, AdmDate, AdmFee etc.
SubjectInfo i.e. SubID, SubName, SubStatus etc.
The Result table is like this:
ResID, AdmID, SubID, TheoryMarks, PracticalMarks, ObtMarks, TotalMarks, ResultTerm, SubPercentage.
ResID is PK, AdmID and SubID are Foreign Keys, right. Now What i want to ask/ learn that Am i suppose to combine ResID, AdmID and SubID as a composite PK or should i simply make the ResID as PK and other 2 be there as FK? When do we really need to use Composite PK and using it a good thing or not?
i have a master table with around 15 columns and i am trying to findthe appropriate primary keys and indexes for the table.To make the records unique, i need to include two datetime columns (start and end dates ) and two integer columns ( attributes of therecord ) to make up a composite primary key. Both of these fourcolumns are found in the WHERE clause of my queries.Is it acceptable in the view of performance and how should i createthe indexes?
View 5 Replies View RelatedThis is really not a T_SQL question but there's no good category for it so I thought I'd just put it here.
I have a table that will contain a large amoutn of data in one field, and every piece of this data is uniquely identitied by six other attributes, that is, six other fields (e.g. user_ID, type_ID, year, country, state, item_ID). I can either make these six fields into a composite primary key, or add an additonal field (say an identity column) as the primary key and add a unique constraint on these six fields. What are the pros and cons of both designs? The one data field is of nvarchar(2000) type and the table is likely to have 50 million+ rows in a couple of years of real use.
This table is not referenced by any other tables so whatever the primary key is, there's no FK reference. However, there could be FK references to this table in the future. Does the FK possibility make a difference in the design considerations?
Hello,
Does composite primary key affect performance on the table that contains the composite primary key or tables that references this table?
When composite primary key should be used?
Hi
I'm trying to create a composite Primary Key on a table. This is the SQL I've written:
CREATE TABLE BookingItems
(
BookingID INT NOT NULL
REFERENCES Bookings(BookingID),
EquipmentTypeID INT NOT NULL
REFERENCES EquipmentType(EquipmentTypeID),
CONSTRAINT PK_BookingItems_id PRIMARY KEY
(BookingID, EquipmentTypeID)
)
Is this right? I'm trying to define a Primary Key made up of BookingID and EquipmentTypesID, which are both Foreign Keys as defined in the column definition.
Thanks
Jon
Newbie question...
I have two tables (categories & listings) which create a many-to-many relationship.
I have created an interim table with the primary keys from each table as a composite primary key...(cat_id & list_id).
How does the interim table get populated with the id's?
When I do an insert statement to insert data into the categories table, the cat_id field is automatically generated...same with the listings table, but when (and how) does the primary key data get into the interim table.
Thanks in advance for the assistance.
I'm trying this
Code:
CREATE TABLE Rating
(ContentID int NOT NULL PRIMARY KEY REFERENCES Content_(ContentID),
UserID int NOT NULL PRIMARY KEY REFERENCES Usr(UserID),
rating tinyint DEFAULT 2,
LastRead smalldatetime NOT NULL DEFAULT CURRENT_TIMESTAMP)
And it is telling me this:
Msg 8110, Level 16, State 0, Line 14
Cannot add multiple PRIMARY KEY constraints to table 'Rating'.
So how do I combine two non-unique foreign keys, the combination of which is unique, into one primary key?
My previous post was not really clear, so I'll try again with a (hopefully) better (even if longer) example...
Consider the following...
A JOB describes the processment of a document.
Each document can exist in two versions: English and French.
A JOB can have 1 or 2 TASK, each describing the processement of either the English or French version.
So we have the following:
A: JOB (JobNum [PK], DocReference, StartDate, EndDate, ...)
B: TASK (JobNum [PK] [FKa], Version [PK], Priority, ...)
that is there is an identifying 1:M (where maxium allowed for M is 2) relationship between JOB and TASK; TASK being identified by JobNum and Version (where the domain for Version is {E, F}).
Each TASK may require a TRANSLATION sub_task.
Each TASK may require a TYPING sub_task.
Each TASK may require a DISTRIBUTION sub_task.
For example, for a given doc, the English TASK requires TRANSLATION and DISTRIBUTION, while the French only DISTRIBUTION.
That is, there is a 1:1 not-required relationship between TASK and TRANSLATION, TYPING and DISTRIBUTION.
So we have the following:
A: JOB (JobNum [PK], DocReference, StartDate, EndDate, ...)
B: TASK (JobNum [PK] [FKa], Version [PK], Priority, ...)
C: TRANSLATION (JobNum [PK] [FKb], Version [PK] [FKb], DueDate, ...)
D: TYPING (JobNum [PK] [FKb], Version [PK] [FKb], DueDate, ...)
E: DISTRIBUTION (JobNum [PK] [FKb], Version [PK] [FKb], Copies, ...)
As you can see I am using the PK of TASK as FK and PK for each of the three SUB_TASKs.
To complicate things, each SUB_TASK has one or more assignments. The assignments for each SUB_TASK records different information from the others.
So we have...
A: JOB (JobNum [PK], DocReference, StartDate, EndDate, ...)
B: TASK (JobNum [PK] [FKa], Version [PK], Priority, ...)
C: TRANSLATION (JobNum [PK] [FKb], Version [PK] [FKb], DueDate, ...)
D: TYPING (JobNum [PK] [FKb], Version [PK] [FKb], DueDate, ...)
E: DISTRIBUTION (JobNum [PK] [FKb], Version [PK] [FKb], Copies, ...)
F: TRA_ASSIGN (JobNum [PK] [FKc], Version [PK] [FKc], Index [PK], Translator, ...)
G: TYP_ASSIGN (JobNum [PK] [FKd], Version [PK] [FKd], Index [PK], Typyst, ...)
H: REP_ASSIGN (JobNum [PK] [FKe], Version [PK] [FKe], Index [PK], Pages, ...)
that is there is an identifying 1:M relationship between each SUB_TASK and its ASSIGNMENTs, each ASSIGNMENT being identified by the SUB_TASK it belongs to and an Index.
I wish I could send a pic of the ER diagram...
Maybe there is another and better way to model this: if so, any suggestion?
Given this model, should I use for TRANSLATION, TYPING and DISTRIBUTION a surrogate key, instead of using the composite key, like for example:
C: TRANSLATION (TranslationID [PK], JobNum [FKb], Version [FKb], DueDate, ...)
D: TYPING (TypingID [PK], JobNum [FKb], Version [FKb], DueDate, ...)
E: DISTRIBUTION (DistributionID [PK], JobNum [FKb], Version [FKb], Copies, ...)
this will "improve" the ASSIGNMENTs tables:
F: TRA_ASSIGN (TranslationID [PK] [FKc], Index [PK], Translator, ...)
G: TYP_ASSIGN (TypingID [PK] [FKd], Index [PK], Typyst, ...)
H: REP_ASSIGN (DistributionID [PK] [FKe], Index [PK], Pages, ...)
I could even go further using a surrogate key even for TASK, which leads me to the following:
A: JOB (JobNum [PK], DocReference, StartDate, EndDate, ...)
B: TASK (TaskID [PK], JobNum [FKa], Version , Priority, ...)
C: TRANSLATION (TaskID [PK] [FKb], DueDate, ...)
D: TYPING (TaskID [PK] [FKb], DueDate, ...)
E: DISTRIBUTION (TaskID [PK] [FKb], Copies, ...)
F: TRA_ASSIGN (TaskID [PK] [FKc], Index [PK], Translator, ...)
G: TYP_ASSIGN (TaskID [PK] [FKd], Index [PK], Typyst, ...)
H: REP_ASSIGN (TaskID [PK] [FKe], Index [PK], Pages, ...)
I don't really like this second solution, but I'm still not sure about the first solution, the one with the surrogate key only in the SUB_TASks tables.
Hi All,
I have a table that has 3 columns, two of them make a composite primary key. The table is populated with data. What I need to do is to add a third column to a composite primary key. I have tried to do that with the following command:
alter table databasesize
add constraint pk_dbsize primary key (dbid)
But I get the error message:
Table 'databasesize' already has a primary key defined on it.
How can I do this?
Hi,
I'm currently writing a small application that is using SQL Server as a back-end database. A part of my database looks something lie the following:
Tables:
Orders(OrderId[int, PK], OrderDescription[varchar] etc...)
OrderLines(OrderId[int, PK, FK], OrderLineId[int, PK], etc...)
What I need to achieve is - everytime that a new line is inserted into an orderlines table part of the primary key will be the OrderId and the OrderLineId should be auto-incremented from 1 for each OrderId in the OrderLines table.
I know i can do this manually in my program, but i'm just wondering if theres a way to achive this in SQL Server?
Thanks,
Nick Goloborodko
hi, can I have a composit primary key which have more than one data type. for instance job_id int,job_type varchar(20)... thanks
Al
Hi,
i want to make a reference from a table on itself.
The table has a composite Primary Key. But I just want to refernce the TEstCaseID.
So whats wrong? Can anyone help me?
CREATE TABLE dbo.TestCase (
Project_projectID VARCHAR(20) NOT NULL references Project,
testCaseID VARCHAR(50) NOT NULL,
PRIMARY KEY(Project_projectID, testCaseID),
FatherID VARCHAR(50) references TestCase(testCaseID)
)
THanx Crean
NOTE:
I am not interested in any responses that want to argue the use of a unique ID field and autonumbering as the PK. It is quite clear from the forums that this subject is a polarizing one. This question is for those who follow text-book design practices and believe that a composite primary key should be used when it is available. I want to be one of them for the time being.
SYNOPSIS:
I have three tables, TestSummary, TestDetails, and Steps.
The TestSummary table looks like this:
Create table TestSummary
(
TestSummaryID int identity primary key,
...
SequenceID int not null
)
It contains the date and time of the test, the serial number, the part number, the test operator's name, and the ID of the sequence of steps used during the test. It uses a unique ID field for the primary key.
The TestDetails table looks like this:
Create table TestDetails
(
TestDetailsID int identity primary key,
TestSummaryID int not null,
StepID int not null,
...
)
It contains the details of the test like voltage readings, current readings, temperature, etc., one record per reading. It also contains the step number of the test sequence specified in the TestSummary table.
The Steps table looks like this:
Create table Steps
(
SequenceID int not null,
StepID int not null,
Function int not null
Primary key (SequenceID, StepID)
)
It contains a list of all of the functions to be performed on the device under test by sequence number and the step number within the sequence.
When I try to establish a relation between TestSummary.SequenceID and Steps.SequenceID, SQL Server flags an error because TestSummary.SequenceID and Steps.SequenceID:Steps.StepID do not match.
What is the problem with this approach?
Is that possible on SQL Server 2000 and onwards?
View 1 Replies View RelatedIs is possible to create a composite primary key on a table variable?Neither of these two statements are successful:DECLARE @opmcjf TABLE (jobdetailid INT NOT NULL,cjfid INT NOT NULL,cjfvalue VARCHAR(100) NULL)ALTER TABLE @opmcjf ADD CONSTRAINT [PK_opmcjf] PRIMARY KEY CLUSTERED([jobdetailid],[cjfid])andDECLARE @opmcjf TABLE (jobdetailid INT PRIMARY KEY,cjfid INT PRIMARY KEY,cjfvalue VARCHAR(100) NULL)Thanks,Shaun
View 2 Replies View RelatedHi ,
We have scenario like this .the source table have composite primary key columns c1,c2,c3,c4.c5,c6 .when we move the records to destination .we have to check columns (c1+ c2 + c3 + c4 + c5 + c6) combination exist in the destination. if the combination exist then we should do a update else we need to do a Insert . how to achive this .we have tryed useing conditional split which is working only for a single Primary key . can any one help us .
Jegan.T
I want to created composite primary key using MS SQL Server Enterprise Manager Interface. I want to use Interface instead of writing it in CREATE Table statement. I was able to create foreign key using this Interface using the "Manage Relationship" option. But cannot find how to add primary key consisting of two fields. Any help regarding this is highly appreciated.
View 2 Replies View RelatedOk, I'm really new at this, but I am looking for a way to automatically insert new records into tables. I have one primary table with a primary key id that is automatically generated on insert and 3 other tables that have foreign keys pointing to the primary key. Is there a way to automatically create new records in the foreign tables that will have the new id? Would this be a job for a trigger, stored procedure? I admit I haven't studied up on those yet--I am learning things as I need them. Thanks.
View 4 Replies View RelatedTable 1
Code
Quarter
500002
26
500002
27
500002
28
500002
28.5
500002
29
Table 2
Code
Qtr
500002
26
500002
27
I have these two identical tables with the columns CODE & Qtr being COMPOSITE PRIMARY KEYS
Can anybody help me with how to compare the two tables to find the records not present in Table 2
That is i need this result
Code
Quarter
500002
28
500002
28.5
500002
29
I have come up with this solution
select scrip_cd,Qtr,scrip_cd+Qtr from Table1 where
scrip_cd+Qtr not in (select scrip_cd+qtr as 'con' from Table2)
i need to know if there is some other way of doing the same
Thanks in Advance
Jacx
Hi All, Can anyone tell me how to create a reference for composite key. For ex, I have created tblEmp table successfully. create tblEmp( empId varchar(100), RegId varchar(100), empname varchar(100),constraint pk_addprimary key(empId, RegId) ) And now, I am going to create another table which references the composite key.create table tblAccount( acctId varchar(100) primary key, empId varchar(100) references tblEmp(empId), RegId varchar(100) references tblEmp(RegId) ) But it gives error like Server: Msg 1776, Level 16, State 1, Line 1There are no primary or candidate keys in the referenced table 'tblEmp' that match the referencing column list in the foreign key 'FK__tbl'.Server: Msg 1750, Level 16, State 1, Line 1Could not create constraint. See previous errors. Could anyone please let me know how to create reference for composite key. Thanks in advance,Arun.
View 4 Replies View RelatedHi all,
well i want to have an web-based database application in which in an single webform , i need to insert the values to 5 different tables.
here empid is primary key (PK) in one table and in the rest of the tables its an Foreign Key(FK)
my question is, how can i create these tables with composite key?
ie, i want to creat an table which will have FK and as well another key which both will uniquely idenitfies a row.
Well i am using SQL server 2000 and i wish to create these tables using the enterprise manager.
here are the tables
1) empidtable
empid,fname,lname
2)empcountrytable
empid,country
3)empvisatable
empid,visa
4)empdoctable
empid,doc
5)empfile
empid,filename,filecontenttype,filesize,filedata
Plz do help me
thanx in advance
I am trying to create a Unique Constraint on a SQL Server 2005 table where the uniqueness is based on 2 columns.
Could anybody provided some help on how I could enforce this on an existing table (link, or example) I have been looking around without luck.
Thanks in advance
John.