SQL Syntax For Foreign Key
Nov 30, 2007I am new beginner for SQL .I have requirement of using foreign key in tables I have created earlier.Can anyone tell me the syntax for the same ?
Please help me, Your suggestions are welcome.
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Incorrect Syntax Near The Keyword CONVERT When The Syntax Is Correct - Why?
May 20, 2008Why does the following call to a stored procedure get me this error:
Msg 156, Level 15, State 1, Line 1
Incorrect syntax near the keyword 'CONVERT'.
Code Snippet
EXECUTE OpenInvoiceItemSP_RAM CONVERT(DATETIME,'01-01-2008'), CONVERT(DATETIME,'04/30/2008') , 1,'81350'
The stored procedure accepts two datetime parameters, followed by an INT and a varchar(10) in that order.
I can't find anything wrong in the syntax for CONVERT or any nearby items.
Help me please. Thank you.
Incorrect Syntax When There Appears To Be No Syntax Errors.
Dec 14, 2003I keep receiving the following error whenever I try and call this function to update my database.
The code was working before, all I added was an extra field to update.
Exception Details: System.Data.SqlClient.SqlException: Incorrect syntax near the keyword 'WHERE'
Public Sub MasterList_Update(sender As Object, e As DataListCommandEventArgs)
Dim strProjectName, txtProjectDescription, intProjectID, strProjectState as String
Dim intEstDuration, dtmCreationDate, strCreatedBy, strProjectLead, dtmEstCompletionDate as String
strProjectName = CType(e.Item.FindControl("txtProjectName"), TextBox).Text
txtProjectDescription = CType(e.Item.FindControl("txtProjDesc"), TextBox).Text
strProjectState = CType(e.Item.FindControl("txtStatus"), TextBox).Text
intEstDuration = CType(e.Item.FindControl("txtDuration"), TextBox).Text
dtmCreationDate = CType(e.Item.FindControl("txtCreation"),TextBox).Text
strCreatedBy = CType(e.Item.FindControl("txtCreatedBy"),TextBox).Text
strProjectLead = CType(e.Item.FindControl("txtLead"),TextBox).Text
dtmEstCompletionDate = CType(e.Item.FindControl("txtComDate"),TextBox).Text
intProjectID = CType(e.Item.FindControl("lblProjectID"), Label).Text
Dim strSQL As String
strSQL = "Update tblProject " _
& "Set strProjectName = @strProjectName, " _
& "txtProjectDescription = @txtProjectDescription, " _
& "strProjectState = @strProjectState, " _
& "intEstDuration = @intEstDuration, " _
& "dtmCreationDate = @dtmCreationDate, " _
& "strCreatedBy = @strCreatedBy, " _
& "strProjectLead = @strProjectLead, " _
& "dtmEstCompletionDate = @dtmEstCompletionDate, " _
& "WHERE intProjectID = @intProjectID"
Dim myConnection As New SqlConnection(System.Configuration.ConfigurationSettings.AppSettings("connectionstring"))
Dim cmdSQL As New SqlCommand(strSQL, myConnection)
cmdSQL.Parameters.Add(new SqlParameter("@strProjectName", SqlDbType.NVarChar, 40))
cmdSQL.Parameters("@strProjectName").Value = strProjectName
cmdSQL.Parameters.Add(new SqlParameter("@txtProjectDescription", SqlDbType.NVarChar, 30))
cmdSQL.Parameters("@txtProjectDescription").Value = txtProjectDescription
cmdSQL.Parameters.Add(new SqlParameter("@strProjectState", SqlDbType.NVarChar, 30))
cmdSQL.Parameters("@strProjectState").Value = strProjectState
cmdSQL.Parameters.Add(new SqlParameter("@intEstDuration", SqlDbType.NVarChar, 60))
cmdSQL.Parameters("@intEstDuration").Value = intEstDuration
cmdSQL.Parameters.Add(new SqlParameter("@dtmCreationDate", SqlDbType.NVarChar, 15))
cmdSQL.Parameters("@dtmCreationDate").Value = dtmCreationDate
cmdSQL.Parameters.Add(new SqlParameter("@strCreatedBy", SqlDbType.NVarChar, 10))
cmdSQL.Parameters("@strCreatedBy").Value = strCreatedBy
cmdSQL.Parameters.Add(new SqlParameter("@strProjectLead", SqlDbType.NVarChar, 15))
cmdSQL.Parameters("@strProjectLead").Value = strProjectLead
cmdSQL.Parameters.Add(new SqlParameter("@dtmEstCompletionDate", SqlDbType.NVarChar, 24))
cmdSQL.Parameters("@dtmEstCompletionDate").Value = dtmEstCompletionDate
cmdSQL.Parameters.Add(new SqlParameter("@intProjectID", SqlDbType.NChar, 5))
cmdSQL.Parameters("@intProjectID").Value = intProjectID
myConnection.Open()
cmdSQL.ExecuteNonQuery
myConnection.Close()
MasterList.EditItemIndex = -1
BindMasterList()
End Sub
Thankyou in advance.
Which Is Faster? Conditional Within JOIN Syntax Or WHERE Syntax?
Mar 31, 2008Forgive the noob question, but i'm still learning SQL everyday and was wondering which of the following is faster? I'm just gonna post parts of the SELECT statement that i've made changes to:
INNER JOIN Facilities f ON e.Facility = f.FacilityID AND f.Name = @FacilityName
OR
WHERE f.Name = @FacilityName
My question is whether or not the query runs faster if i put the condition within the JOIN line as opposed to putting in the WHERE line? Both ways seems to return the same results but the time difference between methods is staggering? Putting the condition within the JOIN line makes the query run about 3 times faster?
Again, forgive my lack of understanding, but could someone agree or disagree and give me the cliff-notes version of why or why not?
Thanks!
Converting Rrom Access Syntax To Sql Syntax
Sep 23, 2007
Ok I am tying to convert access syntax to Sql syntax to put it in a stored procedure or view..
Here is the part that I need to convert:
SELECT [2007_hours].proj_name, [2007_hours].task_name, [2007_hours].Employee,
IIf(Mid([task_name],1,3)='PTO','PTO_Holiday',
IIf(Mid([task_name],1,7)='Holiday','PTO_Holiday',
IIf(Mid([proj_name],1,9) In ('9900-2831','9900-2788'),'II Internal',
IIf(Mid([proj_name],1,9)='9900-2787','Sales',
IIf(Mid([proj_name],1,9)='9910-2799','Sales',
IIf(Mid([proj_name],1,9)='9920-2791','Sales',
)
)
)
)
) AS timeType, Sum([2007_hours].Hours) AS SumOfHours
from................
how can you convert it to sql syntax
I need to have a nested If statment which I can't do in sql (in sql I have to have select and from Together for example ( I can't do this in sql):
select ID, FName, LName
if(SUBSTRING(FirstName, 1, 4)= 'Mike')
Begin
Replace(FirstNam,'Mike','MikeTest')
if(SUBSTRING(LastName, 1, 4)= 'Kong')
Begin
Replace(LastNam,'Kong,'KongTest')
if(SUBSTRING(Address, 1, 4)= '1245')
Begin
.........
End
End
end
Case Statement might be the solution but i could not do it.
Your input will be appreciated
Thank you
Incorrect Syntax Near The Keyword 'from'. Line 1: Incorrect Syntax Near ')'.
May 27, 2008This is the error it gives me for my code and then it calls out line 102. Line 102 is my buildDD(sql, ddlPernames) When I comment out this line the error goes away, but what I don't get is this is the same way I build all of my dropdown boxes and they all work but this one. Could it not like something in my sql select statement. thanksPrivate Sub DDLUIC_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles DDLUIC.SelectedIndexChanged
Dim taskforceID As Byte = ddlTaskForce.SelectedValueDim uic As String = DDLUIC.SelectedValue
sql = "select sidstrNAME_IND from CMS.dbo.tblSIDPERS where sidstrSSN_SM in (Select Case u.strSSN from tblAssignedPersonnel as u " _
& "where u.bitPresent = 1 and u.intUICID in (select intUICID from tblUIC where intTaskForceID = " & taskforceID & " and strUIC = '" & uic & "'))"ddlPerNames.Items.Add(New ListItem("", "0"))
buildDD(sql, ddlPerNames)
End Sub
Foreign Key
Dec 27, 2003Hello,
I want to make a poll and have to use a foreign key in my database. This is not possible in Web Matrix so I have to use SQL Enterprise Manager. But don't know how. I read the help but can't figure it out. Can someone help me??? Thanks in advance.
Regards,
Roel Alblas
Foreign Key
Sep 14, 1998Hi!
Is it possible in SQL 6.5 to create a Foreign Key on a field that
has a datatype of SMALLINT? I have created FK`s with
other datatypes, but it doesn`t seem to work with this particular
datatype. Is there some trick to this?
Thank you for your assistance!
Toni
3NF Foreign Key
Mar 30, 2006When you set a foreign key to reference a primary key on another table, does the foreign key automatically update? Can anyone explain just how to make a relational table from just the nuts and bolts SQL statements.
View 1 Replies View RelatedTwo Foreign Key ?
Dec 20, 2004Hi there,
I'm trying to make a few tables in SQL (First time user). The tables have been derived from a logical model based around my assignment...
I'm having problem getting two foreign keys in one table in the SQL. I keep getting the duplicate foreign key error...
I'm not sure where i'm going wrong.....
http://img.photobucket.com/albums/v294/Jertsy/Agh.jpg
there’s a pic of my tables.... There are 4 tables, blog, blogger, blog_entry, and comment.. Blog is only table without a FK.
have a look & thanks for any and all help....
Spencer.
Foreign Key
Jun 23, 2007Hi Friends,Is there any way to get the table name which is referenced by theforeign keyfor example: consider two table "Staff" and "Department"Staff with following columnsPK_IDFK_DepartmentIDNameAddressDepartment with following columnsPK_DepartmentIDDeptNameActually what i need is: Initially i would be having the table name as"Staff"from Staff table i need to identify that the column FK_DepartmentID isa foreign keyand the primary key is in the Department tablei need to traverse from Staff table and identify that FK_DepartmentIDis a primary key in Department tablethis has to be accomplished by sql query.... probably this could befetched fromData Dictionary but i couldnt find the relationship between the systemtables.ThanksArunDhaJ
View 1 Replies View RelatedForeign Key
Jun 5, 2007I would like to create a foreign key but the Primary table has 2 fields as it Primary Key. Is there a way to create a Foreign Key that links only on one field of the primary key.
Ex: table 1: id int , language char(2), description varchar(100) PK = ID + language
table 2 : id int, idlanguage int PK = id FK (idLanguage refers to id from table 1)
This cause an error because the foreign key does not include all part of the primary key.
Rufen
Foreign Key
Jan 4, 2008table1
-------
a1 number(10) PK
b1 varchar2(3)
c1 number(10)
Table2
----------
d1 number(10) PK
b1 varchar2(3)
c1 number(10)
Can I make a Foreign key from Table2(b1,c1) to table1(b1,c1) if b1 in table1 might be null.
When I tried that I got this.
ORA-02270: no matching unique or primary key for this column-list
Getting Rid Of Foreign Key, How Do I Do That
Apr 13, 2008Hi everyone,
My main table has a column named "customer" which is a foreign key pointed to my secondary table consisted of a column "customer_id".
I wanted to change my secondary table's customer_id's name into another name whereby deleting it and create a new column instead (i dont know another way of changing names by code) but i'm not allowed to do that due to "customer_is"'s being attached to my main table as FK.
Any suggestion how to do it ?
Thanks a lot.
Foreign Key
Aug 10, 2007i want to make primary key and foreign key relationship of table A1 and table B1 but A1 exist in database A and B1 exist in database B
column name u can pretain as C1, C2
Foreign Key Columns
Aug 8, 2006I am deleting a column from a table in code. Before I drop the colum I need to find if the column belongs to a foreign key. I have the names of the foreign keys for the table from sysobjects.How can I determine what columns are part of the foreign key?
View 9 Replies View RelatedForeign Key Problem?
Oct 5, 2006Just installed this the Forum starter Kit and am getting this message when I try to add the first threadI'm a bit of a newbie but not only damp behind the earsThe INSERT statement conflicted with the FOREIGN KEY constraint "FK_MembersForums_MemberInfo". The conflict occurred in database "SQL2005_****_*****01", table "dbo.MemberInfo", column 'memberid'.The statement has been terminated. What do I need to do to the SQL Tables in order to get this to work?
View 3 Replies View RelatedProblems With Foreign Key
Nov 9, 2006Hi, i have 3 tables.
Orders: {OrderNr(PK, autonumber), date}
Order_Line: {OrderNr(FK), ItemNr(FK), number}
Items: {ItemNr(PK), Name, ...}
How do I insert a new Order with a new order_line? I get this error: The INSERT statement conflicted with the FOREIGN KEY constraint
I can't figure out how to capture the autogenerated OrderNr.
Foreign Keys
Apr 17, 2007Can any body tell me how to know to what columns of other table it refers to.
shiva kumar
How Do I Create A Foreign Key
Apr 27, 2007I have a one to many relationship between two tables. The master table is keyed using an int ID field set to IsIdentity yes and this is the primary key. The field name is ChurchID. Likewise the detail table has such a field as it's primary key and is named ContactID.
I carry the ChurchID field in the detail table and would like to make it the foreign key. I could not find this explained in the two books I have and the help was anything but that )perhaps it's just me afterall).
Well, any help in this matter would be greatly appreciated as I find myself at a standstill until this can be resolved.
Thanks in advance.
Help With Foreign Key Relationship
Jul 3, 2007When I try to insert a record on my DB (SQL 2005 Express) I get a constraint error. This is my table setup which has been simplified to expose the problem I have:
Categories TABLEint CatId PKvarchar CatName :
Items TABLEint ItemId PKvarchar ItemName :
X_Items_Categoriesint CatIdint ItemId
So basically I have a one-to-many relationship between Items and Categories, in other words each item is associated to one or more categories and this association is done via the X_Items_Categories cross table. On this cross table I set two constraints:
The CatId of each entry in the cross table (X_Items_Categories) must exist in the Category table, and
Foreign Key Problem
Mar 13, 2008I'm trying to enter data into a SqlServer 2005 database programatically. The databases are part of an open source program I have. I'm encountering the following error when I try to enter data into a particular table:The INSERT statement conflicted with the FOREIGN KEY constraint "FK_CMRC_ProductImages_CMRC_Products". The conflict occurred in database "hscom", table "dbo.CSK_Store_Product", column 'productID'. The statement has been terminated. I understand what's happening theoretically, but I don't know where to look for where the constraint is defined, or how to fix it. I don't see FK_CMRC_ProductImages_CMRC_Products as a file name or a stored procedure. Diane
View 3 Replies View RelatedAdding Foreign Key
Apr 7, 2008tell me how to add foreign keys in sql 2005 express
View 3 Replies View RelatedRemove Foreign Key
Apr 26, 2004Hi
Can anyone tell me how I can remove a foreign key in a SQL database?
Thanks in advance
Foreign Key Conflict
Sep 24, 2004Hi;
I have 2 tables Users and DVDTestResults these tables have a relation over UserID
Users.UserID
DVDTestResults.UserName
both char
But when I try to insert in DVDTestResults I am having an error:
INSERT statement conflicted with COLUMN FOREIGN KEY constraint 'FK_DVDTestResults_Users'. The conflict occurred in database 'Test', table 'Users', column 'UserID'. The statement has been terminated.
can you help me why?
thank you....
Foreign Key Tangle
Aug 12, 2005I'm using stored procedures to update my tables. If I disable the foreign key constraint all works perfectly. Otherwise I get this error:INSERT statement conflicted with TABLE FOREIGN KEY constraint 'FK_wansub_invoice'. The conflict occurred in database 'test1', table 'invoice'. The statement has been terminated. I don't understand why I'm getting the error, because when I disable the constraint even the foreign key fields are updated properly and there is no apparent conflict with the linked table. I've included my c# code and the stored procedure below.FYI the foreign keys in question are InvoiceDate, AccountNum, CarrierId, and Cycle. These are the primary keys in the "invoice" table, and foreign keys in the "wansub" table. It is vital that all records in the wansub table are matched with a record in the invoice table, so I have to have this constraint in place. C# code to create parameters and call the sp:
public int updateWanTable(WanSubaccount sub, Invoice invoice)
{
SqlCommand cmdUpdateWan;
int returnvalue = 0;
cmdUpdateWan = new SqlCommand("usp_updatewan", conn);
cmdUpdateWan.CommandType = CommandType.StoredProcedure;
SqlParameter invoicedate = cmdUpdateWan.Parameters.Add("@InvoiceDate", SqlDbType.SmallDateTime);
invoicedate.Value = DateTime.Parse(invoice.InvoiceDate.Trim());
SqlParameter subaccountnumber = cmdUpdateWan.Parameters.Add("@SubaccountNumber", SqlDbType.VarChar, 50);
subaccountnumber.Value = sub.SubaccountNumber.Trim();
SqlParameter addressa = cmdUpdateWan.Parameters.Add("@AddressA", SqlDbType.VarChar, 50 );
addressa.Value = sub.Address.Trim();
SqlParameter citya = cmdUpdateWan.Parameters.Add("@CityA", SqlDbType.VarChar, 50 );
citya.Value = sub.City.Trim();
SqlParameter statea = cmdUpdateWan.Parameters.Add("@StateA", SqlDbType.VarChar, 50 );
statea.Value = sub.State.Trim();
SqlParameter zipa = cmdUpdateWan.Parameters.Add("@ZipA", SqlDbType.NChar, 10 );
zipa.Value = sub.Zip.Trim();
SqlParameter countrya = cmdUpdateWan.Parameters.Add("@CountryA", SqlDbType.VarChar, 50 );
countrya.Value = sub.Country.Trim();
SqlParameter addressb = cmdUpdateWan.Parameters.Add("@AddressB", SqlDbType.VarChar, 50 );
addressb.Value = sub.AddressB.Trim();
SqlParameter cityb = cmdUpdateWan.Parameters.Add("@CityB", SqlDbType.VarChar, 50 );
cityb.Value = sub.CityB.Trim();
SqlParameter stateb = cmdUpdateWan.Parameters.Add("@StateB", SqlDbType.VarChar, 50 );
stateb.Value = sub.StateB.Trim();
SqlParameter zipb = cmdUpdateWan.Parameters.Add("@ZipB", SqlDbType.NChar, 10 );
zipb.Value = sub.ZipB.Trim();
SqlParameter countryb = cmdUpdateWan.Parameters.Add("@CountryB", SqlDbType.VarChar, 50 );
countryb.Value = sub.CountryB.Trim();
SqlParameter speed = cmdUpdateWan.Parameters.Add("@Speed", SqlDbType.VarChar, 50 );
speed.Value = sub.Speed.Trim();
SqlParameter type = cmdUpdateWan.Parameters.Add("@Type", SqlDbType.VarChar, 50 );
type.Value = sub.Type.Trim();
SqlParameter monthlycharge = cmdUpdateWan.Parameters.Add("@MonthlyCharge", SqlDbType.Money );
monthlycharge.Value = sub.MonthlyServiceFee;
SqlParameter discounts = cmdUpdateWan.Parameters.Add("@Discounts", SqlDbType.Money );
discounts.Value = sub.Discounts;
SqlParameter other = cmdUpdateWan.Parameters.Add("@Other", SqlDbType.Money );
other.Value = sub.Other;
SqlParameter ucc = cmdUpdateWan.Parameters.Add("@UCC", SqlDbType.Money );
ucc.Value = sub.Ucc;
SqlParameter fedtax = cmdUpdateWan.Parameters.Add("@FedTax", SqlDbType.Money );
fedtax.Value = sub.FedTax;
SqlParameter statetax = cmdUpdateWan.Parameters.Add("@StateTax", SqlDbType.Money );
statetax.Value = sub.StateTax;
SqlParameter othertax = cmdUpdateWan.Parameters.Add("@OtherTax", SqlDbType.Money );
othertax.Value = sub.OtherTax;
SqlParameter accountnum = cmdUpdateWan.Parameters.Add("@AccountNum", SqlDbType.VarChar, 50 );
accountnum.Value = invoice.AccountNumber.Trim();
SqlParameter carrierid = cmdUpdateWan.Parameters.Add("@CarrierId", SqlDbType.Int );
carrierid.Value = invoice.CarrierId;
SqlParameter isthirdparty = cmdUpdateWan.Parameters.Add("@IsThirdParty", SqlDbType.Bit );
isthirdparty.Value = sub.IsThirdParty;
SqlParameter thirdparty = cmdUpdateWan.Parameters.Add("@ThirdPartyBillingCompany", SqlDbType.VarChar, 50 );
thirdparty.Value = sub.ThirdPartyBillingCompany.Trim();
SqlParameter var = cmdUpdateWan.Parameters.Add("@Comments", SqlDbType.VarChar, 255 );
var.Value = sub.Comments.Trim();
SqlParameter notes = cmdUpdateWan.Parameters.Add("@Notes", SqlDbType.VarChar, 255 );
notes.Value = sub.Notes.Trim();
SqlParameter cycle = cmdUpdateWan.Parameters.Add("@Cycle", SqlDbType.Int );
cycle.Value = invoice.Cycle;
// try
// {
conn.Open();
// }
// catch{
//
// }
// try{
returnvalue = cmdUpdateWan.ExecuteNonQuery();
// }
// catch(SqlException e){
// returnvalue = 2;
// }
// finally{
conn.Close();
fill(this);
// }
return returnvalue;
}The SP:CREATE PROCEDURE usp_updatewan( @InvoiceDate smalldatetime, @SubaccountNumber varchar(50), @AddressA varchar(50), @CityA varchar(50), @StateA varchar(50), @ZipA nchar(10), @CountryA varchar(50), @AddressB varchar(50), @CityB varchar(50), @StateB varchar(50), @ZipB nchar(10), @CountryB varchar(50), @Speed varchar(50), @Type varchar(50), @MonthlyCharge money, @Discounts money, @Other money, @UCC money, @FedTax money, @StateTax money, @OtherTax money, @AccountNum varchar(50), @CarrierId int, @IsThirdParty bit, @ThirdPartyBillingCompany varchar(50), @Comments varchar(255), @Notes varchar(255), @Cycle int)
AS
if exists ( select * from wansub where InvoiceDate = @InvoiceDate and SubaccountNumber = @SubaccountNumber and AccountNum = @AccountNum and CarrierId = @CarrierId and Cycle = @Cycle ) Begin --if the record exists update wansub set AddressA = @AddressA, CityA = @CityA, StateA = @StateA, ZipA = @ZipA, CountryA = @CountryA, AddressB = @AddressB, CityB = @CityB, StateB = @StateB, ZipB = @ZipB, CountryB = @CountryB, Speed = @Speed, Type = @Type, MonthlyCharge = @MonthlyCharge, Discounts = @Discounts, Other = @Other, UCC = @UCC, FedTax = @FedTax, StateTax = @StateTax, OtherTax = @OtherTax, IsThirdParty = @IsThirdParty, ThirdPartyBillingCompany = @ThirdPartyBillingCompany, Comments = @Comments, Notes = @Notes EndElse Begin
insert into wansub values (@InvoiceDate, @SubaccountNumber, @AddressA, @CityA, @StateA, @ZipA, @CountryA, @AddressB, @CityB, @StateB, @ZipB, @CountryB, @Speed, @Type, @MonthlyCharge, @Discounts, @Other, @UCC, @FedTax, @StateTax, @OtherTax, @AccountNum, @CarrierId, @IsThirdParty, @ThirdPartyBillingCompany, @Comments, @Notes, @Cycle)
EndGOAny help is greatly appreciated! Especially since I have other tables with this very problem as well . . .
Foreign Key In One To Many Relationship
Feb 20, 2006Hi
I have a one to many relationship between two MS SQL tables.
When inserting a record in the master table (primary key is autoinc) how can I get this value for setting in the foreign key details table?
TIA
Problem Regarding Foreign Key
Mar 20, 2006i have 3 table which is merchant, merchantcategory and merchantitem.
merchantcategory's foreign key is refer to merchant_id, and merchantitem's foreign key is refer to merchantcategory_id......
the problem is like this....
i would like to select all the available items from merchantitem, but i only have the information of merchant_id, so what method should i use to get these output ??
i am using the functions which generated by codesmith with wilson ORMapper method.....
i really hope that someone will provide me the solution......thanks
Conditional Foreign Key - Can It Be Done???
May 17, 2001Hello Folks,
Well I've hit the wall on this one:
I'm wondering if one can designate a conditional foreign key that relates to one of many different tables depending on the "type" column in the foreign key's. My goal is to come up with some SQL code that will allow for this in a Create table statement. (By the way I'm using MS SQL-7 but I'm wondering if this can be done in general.)
I have two simple cases below that show illustrate what I'm trying to do:
Thanks in advance, -JerryZZ
---------------------------------------------------------
Case 1: The foreign key relation is to a primary key
Table: Invoices
-Fields:
---InvoiceID ..... (primary key)
---BilleeID ...... (fkey to Manfacturers.ManfID IF BilleeType=M)
...................(fkey to Distibutors.DistID IF BilleeType=D)
---BilleeType .....(constraint = M or D)
Table: Manufacturers
-Fields:
---ManfID ........ (primary key)
---CompanyName.. (not null)
Table: Distributors
-Fields:
---DistID ........ (primary key)
---CompanyName .. (not null)
---------------------------------------------------------
Case 2: The foreign key relation is to a unique "not null" non-primary key
Table: InvoicesEmail
-Fields:
---InvoiceID ..... (primary key)
---EmailAddress .. (fkey to Manfacturers.EmailAddress IF BilleeType=M)
...................(fkey to Distibutors.EmailAddress IF BilleeType=D)
---BilleeType .....(constraint = M or D)
Table: Manufacturers
-Fields:
---ManfID ........ (primary key)
---EmailAddress .. (unique, not null)
Table: Distributors
-Fields:
---DistID ........ (primary key)
---EmailAddress .. (unique, not null)
---------------End-O-Message-------------------------------------
Foreign Key -- Urgent
Sep 5, 2001Hi All,
For some reason I have to drop a foreign key in the table and recreate them again. for example, I droped titleauthor table's foreign key in the PUBS database, then I want to recreate them again, but I got error massage. I used below script:
alter table titleauthor
drop CONSTRAINT FK__titleauth__au_id__164452B1
====
alter table titleauthor
add constraint FK__titleauth__au_id__164452B1 foreign key (au_id) references authors(au_id)
**************error message*************
Server: Msg 547, Level 16, State 1, Line 1
ALTER TABLE statement conflicted with COLUMN FOREIGN KEY constraint 'FK__titleauth__au_id__164452B1'. The conflict occurred in database 'pubs', table 'authors', column 'au_id'.
******************************************
Anybody can please tell me where is wrong?
Thank you so much!!!
Foreign Key Constraint
Aug 11, 1999student --- enrollment is 1- to - many . ssn is pk in student. ssn and courseid is pk in enrollment. later I added the foreign key constraint FK_SSN in enrollment table reference student table. it is ok.
enrollment --- lessonhistory is 1-to -many, ssn, courseid and lessonid is pk in lessonhistory . I tried to set FK_SSN foreign key constraint in lessonhistory table reference enrollment table, it always show error message " no primary key in referewnce talbe enrollment "
I don't know how to fix it. could you help me out, thanks!!
Foreign Keys
Aug 24, 1999Could someone enlighten me as to the advantage of using the foreign key tab when in table design mode in the Enterprise Manager. Does it have any advantages ?? Is it necessary ??
thanks in advance
Paul
Foreign Keys
Mar 29, 2001I haven't tried, but does anyone know if its possible to a have a foreign key for two tables when the tables reside in different databases (on the same server)?
Thanks,
Doug Smith