How Many Foreing Keys Does A Table Has?
Dec 12, 2007
hi
I could not build a query using the system tables; where I can know how many foreing keys does a specific table has? I´m lost.
can somebody help me... thanks
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Generate Script For Primary Keys And Foreing Keys
May 16, 2008
Pls let me know How I generate script for All primary keys and foreign keys in a table. Thereafter that can be used to add primary keys and foreign keys in another databse with same structure.
Also how I script default and other constraints of a table?
Obtaining Foreing Keys Dependences
Jan 6, 2006I want to know how to obtain the relationships of foreing keys when they have diferent names in diferent tables using SQL querys from VB.net in SQL Server 2000.
Example:
Table Person
------------
IDPerson
Name
Address
Table Customer
--------------
IDCustomer
.
.
.
Table Employee
---------------
IDEmployee
.
.
.
The dependencies are:
IDPerson--->IDCustomer
IDPerson--->IDEmployee
Creating Inter-table Relationships Using Primary Keys/Foreign Keys Problem
Apr 11, 2006Hello again,
I'm going through my tables and rewriting them so that I can create relationship-based constraints and create foreign keys among my tables. I didn't have a problem with a few of the tables but I seem to have come across a slightly confusing hiccup.
Here's the query for my Classes table:
Code:
CREATE TABLE Classes
(
class_id
INT
IDENTITY
PRIMARY KEY
NOT NULL,
teacher_id
INT
NOT NULL,
class_title
VARCHAR(50)
NOT NULL,
class_grade
SMALLINT
NOT NULL
DEFAULT 6,
class_tardies
SMALLINT
NOT NULL
DEFAULT 0,
class_absences
SMALLINT
NOT NULL
DEFAULT 0,
CONSTRAINT Teacher_instructs_ClassFKIndex1 FOREIGN KEY (teacher_id)
REFERENCES Users (user_id)
)
This statement runs without problems and I Create the relationship with my Users table just fine, having renamed it to teacher_id. I have a 1:n relationship between users and tables AND an n:m relationship because a user can be a student or a teacher, the difference is one field, user_type, which denotes what type of user a person is. In any case, the relationship that's 1:n from users to classes is that of the teacher instructing the class. The problem exists when I run my query for the intermediary table between the class and the gradebook:
Code:
CREATE TABLE Classes_have_Grades
(
class_id
INT
PRIMARY KEY
NOT NULL,
teacher_id
INT
NOT NULL,
grade_id
INT
NOT NULL,
CONSTRAINT Grades_for_ClassesFKIndex1 FOREIGN KEY (grade_id)
REFERENCES Grades (grade_id),
CONSTRAINT Classes_have_gradesFKIndex2 FOREIGN KEY (class_id, teacher_id)
REFERENCES Classes (class_id, teacher_id)
)
Query Analyzer spits out: Quote: Originally Posted by Query Analyzer There are no primary or candidate keys in the referenced table 'Classes' that match the referencing column list in the foreign key 'Classes_have_gradesFKIndex2'. Now, I know in SQL Server 2000 you can only have one primary key. Does that mean I can have a multi-columned Primary key (which is in fact what I would like) or does that mean that just one field can be a primary key and that a table can have only the one primary key?
In addition, what is a "candidate" key? Will making the other fields "Candidate" keys solve my problem?
Thank you for your assistance.
Problem With A Foreing Key
Jul 20, 2005I'm a beginner in using SQLServer and I 'm trying to bring a db Schemawritten for DB2 into SQLServer.My problem is this: using a tool to translate the script for creating theDB, I obtain the following code:ALTER TABLE PROJECT.RSURETTA ADD FOREIGN KEY(VOCE )REFERENCES PROJECT.RSANVOCE(VOCE ) ON DELETE SET NULL ON UPDATE NO ACTIONBut, when I try to run the script the system says:Incorrect syntax near the keyword 'SET'.Can I assign a null value to an other table with a reference?Thank youFede
View 2 Replies View RelatedReplication Foreing Key Problem
Mar 14, 2006Hi,
I want to replicate in the same Server 2 tables, first I test with the same data datbases in other Server but 1 table and all is ok , when I try to do the same in the production server occurs an error, Distibution Agent Error Details show me this: Could not drop object 'SER_CURRENCY' because it is referenced by a FOREIGN KEY constraint. Like I said first I run a test, in this test I check IDENTITY: YES (Not for replication), ENFORCE RELATIONSHIPS FOR REPLICATION is unchecked.
My scenario is:
- Windows XP, SQL Server 2000 Developer Edition sp4.
Please, I want to know other reason for this error. Thanks
- Neyver.
How Can I Split Fields And Depending One Column Decide The Foreing Key
Oct 19, 2007I´m wondering how to solve the following scenario with SSIS
I have a CITY table and a STATE table, I have to load a file with the information regarding to the CITY:
the state table is like this:
StateCode(PK) stateLegalCode stateName
============= ============== =========
1 01 Florida
the city table is like this:
citycode(PK) cityLegalCode cityname StateCode(FK)
============ ============= ======== =============
1 1001 Quakertown 1
the file has the following information
cityLegalCode cityName
============= ========
01-1001 Quakertown
...
how can I load the file into CITY table:
1-) with the file's cityLegalCode I have to split the string and if the two initial digits are 01 the registry must have 1 in the StateCode(FK).
how can I do something like that using SSIS???
thanks
Creating Indexes On Columns That Are Foreign Keys To Primary Keys Of Other Tables
Jul 16, 2014what the best practice is for creating indexes on columns that are foreign keys to the primary keys of other tables. For example:
[Schools] [Students]
---------------- -----------------
| SchoolId PK|<-. | StudentId PK|
| SchoolName | '--| SchoolId |
---------------- | StudentName |
-----------------
The foreign key above is as:
ALTER TABLE [Students] WITH CHECK ADD CONSTRAINT [FK_Students_Schools]
FOREIGN KEY([SchoolId]) REFERENCES [Schools] ([SchoolId])
What kind of index would ensure best performance for INSERTs/UPDATEs, so that SQL Server can most efficiently check the FK constraints? Would it be simply:
CREATE INDEX IX_Students_SchlId ON Students (SchoolId)
Or
CREATE INDEX IX_Students_SchlId ON Students (SchoolId, StudentId)
In other words, what's best practice for adding an index which best supports a Foreign Key constraint?
2 Different Foreign Keys In One Table
Jun 13, 2006There is itemlookup table, which stores item number and itemdescription. Also there is a child table, pricehistory, of theitemlookup table, which stores different prices and different dateranges. So it is one-to-many relationship. (Price can be stored morethan one with a different date range)And there is another table RequestItem that stores the foreign key ofthe itemlookup table to show the information of the itemlookup table.Then how do I know later which date range of the price was stored inthe RequestItem table? Since I only keep the foreign key of theitemlookup table, it will be impossible to keep track of the row of thepricehistory table if there are more than one data existed in thepricehistory table.Will it be a valid table structure to create a column for the foreignkey of the pricehistory in RequestItem table or any other ways tohandle this issue?
View 1 Replies View RelatedTable Names As Keys?
Jul 20, 2005Hello all,I got a chance to peak into a database system. Part of its design israther unfamiliar to me. When I look at the diagram generated by SQLServer, there are many floating tables. Eventually it turns out thatthese many floating tables are actually not floating. Their tablenames relate to fields (as TableID) in other tables. In this case,you can get a handle to one of such tables by search TableID columnsin other tables.To be more specific, the database is a microarray database implementedin SQL Server 2000. They have a table called MICROARRAYS. In thistable, there is a column called table_id. These table_ids are in facttable names of a bunch of other tables.My questions are1) Is this good relational design?2) How well is this kind of design supported in SQL Server?3) Are there better alternatives?Any other comment or link to helpful resources will also beappreciated.Thanks,Eric Wu
View 2 Replies View RelatedWhen Updating Keys How Do Cascade The Changes To Other Table?
Dec 13, 2007I'm using SqlDatasource when the update process is on a primary key, how do you cascade the changes to other tables?
Also when deleting does the cascade deletes the row from another table or only sets the primary key to NULL?
Update Table, Foreign Keys Etc
Aug 16, 2004I have two tables as below. I want to update a quote and change the item for which it is for. So I want to do an update statement to change the cat_ref that the quote is for. However, when I do this I get a foreign key conflict with cat_ref in the item table. How do I get around this? Thanks
Code:
CREATE TABLE Item (
cat_ref VARCHAR(5)PRIMARY KEY,
descrip VARCHAR(50),
date_added SMALLDATETIME,
cat_type VARCHAR(20))
CREATE TABLE has_quote (
quote_id INT IDENTITY (1,1) PRIMARY KEY,
date_last_pricecheck SMALLDATETIME,
cat_ref VARCHAR(5)FOREIGN KEY
REFERENCES Item(cat_ref)
ON DELETE CASCADE,
first_name VARCHAR(10),
surname VARCHAR(10),
FOREIGN KEY (first_name, surname)
REFERENCES Customer(first_name, surname)
ON DELETE CASCADE
ON UPDATE CASCADE)
Create Table With Foreign Keys
May 30, 2007How do I create a table with a foreign key
View 6 Replies View RelatedTwo Primary Keys In A Single Table
Jul 15, 2012I have a table fields Register_date, Std_ID, course, version, CourseLearningDays, Batch_Time and Trainer_IDHOw to make Register_date and Batch_Time as primary key in the table.. What are the necessary datatype for these two fields.And one more do we have datatype called date and time in MS SQL Server...
View 1 Replies View RelatedUpdate One Table From Another Using Primary Keys
Apr 17, 2014I have two tables:
tbl_Vehicles (primary table)
tbl_DealerFeed_temp (temporary table)
I load values from a TXT file into the temporary table. From there, I figure out which records are new and need to be added to the primary table, and which records are duplicates, and need to a) update the primary table and b) be deleted from the temporary table.Basically, I need to write a SQL statement to grab the records that exist in BOTH tables based upon two primary criteria:
d_id in temporary table = d_id in primary table
df_t_v_stock_number in temporary table = v_stock_number in primary table
There are several fields that must be updated if the d_id and v_stock_number match:
v_price
v_internet_price
v_other_price
v_mileage
Problem In Table With Two Foreign Keys
Feb 5, 2008Hello,
I have a very elementary question on table design. This screenshot (which is part of a larger diagram) sets the context of the question.
There are two distinct groups of products with different attributes, hence two separate tables: Products_A and Products_B.
There's a third table that keeps track of daily production (DailyProduction), which must accept items from either product table. Now, my question is: How do I relate these two tables to "DailyProduction" ? If I place a double-constraint with two foreign keys, then I get an error whenever I attempt to insert a record in DailyProduction. For example, if the new item is of "Products_A" type, then the error message from SSMS is:
No row was updated.
The data in row 1 was not committed.
Error Source: .Net SqlClient Data Provider.
Error Message: The INSERT statement conflicted with the FOREIGN KEY constraint "FK_DailyProduction_Products_B". The conflict occurred in database "MyDatabase", table "dbo.Products_B", column 'ProductB_ID'.
The statement has been terminated.
Correct the errors and retry or press ESC to cancel the change(s).
It's clear that the error message makes sense as SQL is trying to apply BOTH constraints. It's one AND the other, not one OR the other. Now, how do I remedy this ? What would be the most appropriate way to relate the three tables ?
Thanks.
Fernando
Urgent !!!!! Nee Explanation On Primary Keys And FK Keys
Jul 15, 2002Can somebody explain to me how to best do inserts where you have primary keys and foreign keys.l'm battling.
Is there an article on primary keys/Pk ?
Foreign Keys - On Which Kind Of Keys Do The Base On?
Nov 22, 2007Hello!I have a table A with fields id,startdate and other fields. id and startdateare in the primary key.In the table B I want to introduce a Foreign key to field id of table A.Is this possible? If yes, which kind of key I have to build in table A?Thx in advance,Fritz
View 6 Replies View RelatedInsert Records Into A Table With Foreign Keys
May 21, 2008i'm using sql express, management studio express and a visual web developer starter kit.
i have 4 tables: items; categories; categorization; old_items
the old_items table has both the item id and category fields in it, the new db has them separated: items.id; categories.id; categorization.itemId, categorizaton.parentCategoryId, both of which are foreign keys.
i need to get the old_item.id and old_item.category values into the new categorization table but it keeps choking on the foreign keys and i can't get past it. as far as i've been able to figure out so far, i need to turn off the foreign keys to do the insert but i'm not sure and i haven't been able to find any sql query examples that demonstrate it or explain it well enough for my n00b self.
i've read http://msdn.microsoft.com/en-us/library/10cetyt6.aspx, "How to: Disable Foreign Key Constraints with INSERT and UPDATE Statements" but i don't get how that affects it, it seems like one of the other options would actually disable them.
can anyone help? i've been trying all the permutations of queries i can think of and not getting it.
thanks.
Table With Duplicate Entry With Primary Keys
Jun 6, 2004We have a SQL Server 6.5 table, with composite Primary Key, having the Duplicate Entry for the Key. I wonder how it got entered there? Now when we are trying to import this table to SQL2K, it's failing with Duplicate row error. Any Help?
View 4 Replies View RelatedTable Error: Object ID XX, Index ID X. Keys
Jan 2, 2008I have a problem with multiple databases on a server. I originally read another post that went into detail on this same error. After reading the post I decided to re-index the table to see if that would fix my issue. I started on Saturday by re-indexing a table on database 'a' - the process completed after that; I received another error on database 'b' on Monday i subsequently re-indexed all indexes on this database; today I have received the same message on database 'c' and 'd'. All post that I have read seem to point to an issue with only one database and not multiple databases. I have approximately 100 databases on this cluster - SQL 2000. The physical server logs only error shown is '000009ac.00001744::2007/12/29-15:12:58.848 ERR [CP] CppReadCheckpoint unable to copy file U:Disk12Partition1d61e68e-a60f-4ca6-b9ae-df3b893e4bb2 0000001.CPT to C:DOCUME~1mscsLOCALS~1TempCLS302F.tmp, error 3
000009ac.00001744::2007/12/29-15:12:58.848 ERR [CP] CppReadCheckpoint - Was that due to quorum resource not being up ???
' before corruption of database 'a'.
Here is the entire error if you think it will help. The error has been the same on all databases: 12/28/2007 6:23 AM A possible database consistency problem has been detected on database ‘ substituted_name'. DBCC CHECKDB and DBCC CHECKCATALOG should be run on database 'substituted_name'..
When I run the DBCC CHECKDB command I got these errors on Substite name database:
DBCC results for 'FVD_A'.
Msg 2511, Level 16, State 1, Line 1
Table error: Object ID 165575628, Index ID 2. Keys out of order on page (1:12743984), slots 97 and 98.
There are 72920059 rows in 2281375 pages for object 'FVD_A'.
CHECKDB found 0 allocation errors and 1 consistency errors in table 'FVD_A' (object ID 165575628).
DBCC results for 'FVD_CVS322'.
Msg 2511, Level 16, State 1, Line 1
Table error: Object ID 181575685, Index ID 2. Keys out of order on page (1:7250519), slots 30 and 31.
I am at a loss. I believe we may have a bigger issue, but the SAN Administrator and Server Admin are saying there is nothing they can do. Do I have a true SQL Server issue or something else.
HELP!
Query Table Based On Multiple Keys
Jul 23, 2005Hey,I am having some confusion about how to formulate this particularquery.I have 2 tables. Table A has 4 columns say a1,a2,a3,a4 with thecolumns a1,a2,a4 forming the primary key. Table B again has 3 columnswith b1,b2,b3,b4 and like before, b1,b2 and b4 form the primary key.All columns are of the same datatype in both tables. Now I want to getrows from table A which are not present in table B. Whats the best wayof doing this?Thanks--Posted using the http://www.dbforumz.com interface, at author's requestArticles individually checked for conformance to usenet standardsTopic URL: http://www.dbforumz.com/General-Dis...pict235166.htmlVisit Topic URL to contact author (reg. req'd). Report abuse: http://www.dbforumz.com/eform.php?p=815725
View 6 Replies View RelatedDisabling Or Getting Rid Of Foreign Keys So I Can Drop My Table
Apr 18, 2007Kinda new to SQL, using SQL Server 2005.I have some foreign keys in a couple of tables. I need to drop thesetables, but can't since I'll get the error:Msg 3726,Level 16, State 1, Line 1Could not drop object 'Client' because it is referenced by a FOREIGNKEY constraint.I'm not sure how to disable or get rid of these foreign keys so that Ican drop my tables. I tried:ALTER TABLE Client NOCHECK CONSTRAINT ALLAlter Table Client Drop Column Foreign Key Boss_ID;I went into the Object Explorer and deleted the FK lines from eachtable, but still the same error.What am I doing wrong?Thanks for your help.
View 1 Replies View RelatedTable Partitioning With Multiple Keys Coulmns
Apr 18, 2006Table partitioning with multiple key coulmns
Hi champs!
I have one table with around 600 million records.
I want to partition this table on 5 different coulumns.
year, month. coulumn3, coulumn4 and coulumn5.
How do I do this best?
What is the best way of doing this; is there any best practice on ths?
The obvious thing is to make a partition funktion based on the year and month coulmns, but I also want to partition on coulumn3, coulumn4 and coulumn5.
Many thanks
Kurlan
How To Detect That A Sqlserver Table Row Has Foreign Keys And Cannot Be Deleted?
Mar 27, 2006What is the best way to detect that a sqlserver table row has foreign keys and cannot be deleted?Thanks,Keith
View 1 Replies View RelatedScript For Creating Table With Multiple Primary Keys
Feb 1, 2007Hi,
I am trying to execute following sql script in sql-server 2000 query analyzer
CREATE TABLE user_courses (user_id varchar(30) NOT NULL PRIMARY KEY,
course_id varchar(10) NOT NULL PRIMARY KEY)
Its give's me following error :-
Cannot specify multiple primary key constraint
Hence I am not able to ceate table with multiple primary keys. So can any one tell me how to get this done?.
Secondly, Primary key must be unique i.e duplicate values are not allowed in P.K field. But in this case since I am declaring two fileds as primary keys.
Will it allow me to have following records in the user_courses table?
user_id(P.K) course_id(P.K)
bob CRS235
alice CRS235
Tim CRS235
tom CRS635
So, if we consider both the fields as primary keys together than I am not voilating Uniqueness constraint. But, if I look at course_id alone then I am voilating uniqeness property?
Thanks,
SQL 2012 :: Create Table With Both Keys As Foreign (error)
Dec 15, 2014I'm trying to create a table in Microsoft Server Management Studio 2012. The table has two fields which are both foreign keys.
I created the following:
create table tblRoomEquipment(
RoomID nvarchar(8),
EquipmentType nvarchar(1),
foreign key (RoomID) references tblRoom(ID),
foreign key (EquipmentType) references tblEquipment(Type)
)
Both tblRoom and tblEquipment have the red line error which when I highlight say the they both reference an invalid table!
Both tables are there and have primary keys defined as ID & Type. I have searched around and all I could find was that there maybe a permission problem.
Reporting Services :: Recovering Symmetric Key From Keys Table
Jul 29, 2015We had a server give out on us completely. All that is left is a back up of the SSRS database. We have been able to get a new SSRS environment working but the symmetric key doesn't seem to work. Reports will run if we delete all sensitive data through the Config manager and reenter the connection strings into the datasource but if we can get the symmetric key saved in the ReportingServices database to work correctly it will save us a ton of effort. Can we make use of the symmetric key saved in the ReportServer.dbo.Keys table?
View 2 Replies View RelatedTransact SQL :: Identify Primary And Foreign Keys In Two Table
Apr 23, 2015I've attempted to identify a primary and foreign key in these two tables, but I am getting a bunch of errors re duplicate keys and column names needing to be unique.Perhaps the primary and foreign key I have identified don't meet the criteria?
CREATE TABLE StockNames
(
-- Added Primary key to [stock_symbol]
[stock_symbol] VARCHAR(5) NOT NULL CONSTRAINT PK_stock_symbol PRIMARY KEY,
[stock_name] VARCHAR(150) NOT NULL,
[stock_exchange] VARCHAR(50) NOT NULL,
[code].....
A Basic History Table - Foreign Keys And Deletes
Nov 19, 2007Let'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.
An INSERT/UPDATE trigger works well for this sort of thing, where the trigger inserts all of the 'INSERTED' values into a history table that has basically the same table definition as the Users table. But it gets tricky when considering Deletes.
If my History table entries reference back to the User in the Users table, this means that if I ever want to delete the user, I need to delete all their History first. This means I can't keep records of user deletions, which is significant. The other approach is not to have a foreign key reference in the History table, so that if a user is deleted, I can still keep my History about that user. Including deletes.
I have been timid about doing it this way, since I felt it broke the idea of a well structured database. Is there a better way to approach this? Is there a standard way to set up triggered history to track changes, including deletions, from a table?
Thanks,
-Dan
How Do You Grab Keys From Dimensions And Store Them Back Into Your Table
Nov 16, 2006I have run into an issue that seems very simple but I am new to SSIS and DBs in general and therefore cannot solve it. I would like to take data from a SQL Server table, lookup a key from a dimension table and update the same SQL Server table with this data. Is there anyway to do an update using SSIS?
Thanks,
Curtis
DB Design :: Import And Stage Table Surrogate Keys
Apr 30, 2015I want to create an import table for daily rows with an integer column like 20150430 for the date, called DayKey. This table would do one date per day. It would then be imported into a STAGE table which would have the same columns and would have all of the import rows for every day.My question would be this: I want to be able to have an integer Primary Key unless there is a better idea. I could make the STAGE table use an auto-incremented value for the key. Then, when I load the import table which is truncated every day, I could take the NEXT value of the key from the STAGE table and increment by 1.
Let's say the last value in STAGE is 1000, then the next value that would be in IMPORT would be 1001 and incrementing up. Then these would be added to the STAGE table with the associated keys. There is no chance of anyone or anything else adding to the STAGE table any other way.
Please Test My Script To Analyze Table Keys (was Submitted For Your Review...:)
Feb 25, 2005Here is a script I wrote that analyzes datasets and returns all the minimal composite and unary keys that uniquely identify records. I wrote it because I frequently have to analyze client spreadsheets and non-normalized data tables.
On my desktop server it took about two minutes to analyze 2000 permutations of a table with 50 columns and 5000 records.
Please try it out for me and let me know if it chokes on anything, or if you see any ways it could be improved!