Copy And Delete Table With Foreign Key References(...,...) On Delete Cascade?
Oct 23, 2004
Hello:
Need some serious help with this one...
Background:
Am working on completing an ORM that can not only handles CRUD actions -- but that can also updates the structure of a table transparently when the class defs change. Reason for this is that I can't get the SQL scripts that would work for updating a software on SqlServer to be portable to other DBMS systems. Doing it by code, rather than SQL batch has a chance of making cross-platform, updateable, software...
Anyway, because it needs to be cross-DBMS capable, the constraints are that the system used must work for the lowest common denominator....ie, a 'recipe' of steps that will work on all DBMS's.
The Problem:
There might be simpler ways to do this with SqlServer (all ears :-) - just in case I can't make it cross platform right now) but, with simplistic DBMS's (SqlLite, etc) there is no way to ALTER table once formed: one has to COPY the Table to a new TMP name, adding a Column in the process, then delete the original, then rename the TMP to the original name.
This appears possible in SqlServer too --...as long as there are no CASCADE operations.
Truncate table doesn't seem to be the solution, nor drop, as they all seem to trigger a Cascade delete in the Foreign Table.
So -- please correct me if I am wrong here -- it appears that the operations would be
along the lines of:
a) Remove the Foreign Key references
b) Copy the table structure, and make a new temp table, adding the column
c) Copy the data over
d) Add the FK relations, that used to be in the first table, to the new table
e) Delete the original
f) Done?
The questions are:
a) How does one alter a table to REMOVE the Foreign Key References part, if it has no 'name'.
b) Anyone know of a good clean way to get, and save these constraints to reapply them to the new table. Hopefully with some cross platform ADO.NET solution? GetSchema etc appears to me to be very dbms dependant?
c) ANY and all tips on things I might run into later that I have not mentioned, are also greatly appreciated.
Thanks!
Sky
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Mar 7, 2007
I have a SQL Mobile DB that I am having problems with deletes cascading via foreign keys to delete all child records. The DB is on a WIndows CE5 device that is running a C#.net application.
The are three tables in my DB that relate to this issue (Tests, TestRawInfo, and TestRawData). The Tests table is the main table. TestRawInfo is a child table of Tests and has a foreign key defined that references the Tests primary key (the relationship is 1:1 with the Tests table). TestRawData is a child table of TestRawInfo and has a foreign key defined that references the TestRawInfo primary key (The relationship is 1:many with the TestRawInfo table). All foreign keys are defined with a Cascade on delete. When I delete one or more records from the Tests table I expect the delete to cascade so that all child records are also deleted. Not all the data gets deleted from the TestRawData table, this results in orphan records. I only see a failure however the next time I attempt to compact the database.
Interestingly I can reproduce the problem by opening my Mobile DB in SQL 2005 on my Desktop and deleting data from the Tests table. If however, I add additional records to these tables through SQL 2005 before attempting to delete, the delete works as expected.
Do you have any ideas on what is going on here? Has any one else reported a similar issue? My current work around is to delete data directly from child tables and not rely on the foreign keys to cascade the deletes.
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Jul 31, 2004
I have a table that contains two foreign keys of two different tables. I want to build a relationship so that when either primary keys deleted in the two tables, the record in the table should be deleted. But, SQL Server does not allow me to save the relationship, it complains that the circling delete might exist. I do not know why, how can I solve this?
Table A:
ID
ProductID <foreign key>
CustomerID <foreign key>
Table Product
ProductID <primary key>
Table Customer
CustomerID <primary key>
I want to cascade delete the record in Table A when either the ProductID is deleted from Product table or the CustomerID is deleted from Customer table.
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Oct 19, 2005
I'm trying to create relational database with some triggers in SQL Server 7.0, but it doesn't work as expected. Let's say that I have 'Office' database with two tables, 'Users' and 'UserRights' (userRights table should have much more rights, but that's not relevant for this problem):
CREATE TABLE [Users] (
[FS_Username] [nvarchar] (8) NOT NULL ,
[FS_Password] [nvarchar] (32) NOT NULL ,
CONSTRAINT [PK_Users] PRIMARY KEY NONCLUSTERED
(
[FS_Username]
) ON [PRIMARY]
) ON [PRIMARY]
GO
CREATE TABLE [UserRights] (
[FS_Username] [nvarchar] (8) NOT NULL ,
[FI_UserType] [int] NOT NULL CONSTRAINT [DF_UserRights_FI_UserType] DEFAULT (1),
[FI_AllowLogin] [int] NOT NULL CONSTRAINT [DF_UserRights_FI_AllowLogin] DEFAULT (1),
CONSTRAINT [PK_UserRights] PRIMARY KEY NONCLUSTERED
(
[FS_Username]
) ON [PRIMARY] ,
CONSTRAINT [FK_UserRights_Users] FOREIGN KEY
(
[FS_Username]
) REFERENCES [Users] (
[FS_Username]
)
) ON [PRIMARY]
GO
Foreign Key CONSTRAIN above is created by adding both tables to the diagram and defining relationship between these two tables FS_Username field, where 'Enable relationship for INSERT and UPDATE' option is turned ON. You can easily see this if you create diagram youself and insert these two tables in it.
Next to this, I created two triggers that should handle inserting/deleting rows in UserRights table as consequence of inserting/deleting rows in Users table:
CREATE TRIGGER InsertUserRights ON Users
FOR INSERT
AS
BEGIN
INSERT INTO UserRights (FS_Username) (SELECT FS_Username FROM Inserted)
END
CREATE TRIGGER DeleteUserRights ON Users
FOR DELETE
AS
BEGIN
DELETE UserRights WHERE FS_Username IN
(SELECT FS_Username FROM Users)
END
Now, when (manually) I insert row in Users table, UserRights table gets updated accordingly. HOWEVER, when I try to delete one or more entries from Users table, I get error report. For example, if you try to execute following two commands:
Insert Into Users (FS_Username, FS_Password) VALUES ('John', 's')
Delete from Users
... first command will succede, but second one will fail with message:
DELETE statement conflicted with COLUMN REFERENCE constraint 'FK_UserRights_Users'. The conflict occurred in database 'Office', table 'UserRights', column 'FS_Username'.
The statement has been terminated.
Does anyone know how to resolve this problem without loosing constrains and triggers ? (If I turn off 'Enable relationship for INSERT and UPDATE' option for relationship, things will work fine, but than I can make inconsistent data in UserRights table).
tnx a lot,
Dejan
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Mar 24, 2007
for MS SQL 2000
I am trying to do a hierarchical table and i want to add a ON DELETE CASCADE
CREATE TABLE [dbo].[Users](
[id_Users] [int] IDENTITY(1,1) NOT NULL PRIMARY KEY CLUSTERED,
[id_UsersSup] [int] NULL,
[Users] [nvarchar] (100) NOT NULL
) ON [PRIMARY]
ALTER TABLE [dbo].[Users] ADD
CONSTRAINT [FK_Users_Sup] FOREIGN KEY
(
[id_UsersSup]
) REFERENCES [Users] (
[id_Users]
)
ON DELETE CASCADE
but MS SQL refuse to create the foreign key
even if there is 4 levels under the deleted id_Users I want to delete all the rows on all levels under
thank you for helping
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May 8, 2008
I have 4 colums in a table
Project, Sections,Tasks,Subtasks
Each subtask will haven a row.
I need to write a trigger when I delete a task it needs to delete all the subtasks relating to it. When I delete a section it needs to delete all the tasks and subasks relating to it. similarly for project.
This trigger for task-subtask works.
CREATE TRIGGER "[Deletetasktrigger]" ON [Tbl] FOR DELETE AS
SET NOCOUNT ON
/* * CASCADE DELETES TO '[Tbl B]' */
DELETE [tbl] FROM deleted, [Tbl] WHERE deleted.[task] = [Tbl].[task]
THis works fine. But when I do it for sections I get this error.
"Maximum stored procedure, function, trigger, or view nesting level exceeded (limit 32)" ..
Help Please!!!!!!
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Jul 12, 2007
hello, once upon a time when i created my db (originally in access then used the conversion tool, which i now know is wrong!) i thought it would be an amazing idea to have cascading updates and deletes, however it turns out now this is exactly not what i want! if i leave them in then it throws errors when i delete records out of my stock table as related records are in the order_line table here is the code (well i think so, im not the best at sqlserver as you probably can tell already) that im using if anyone can help or point me in the right direction that would be great, thanks USE [nashdfDB1]GO/****** Object: Table [dbo].[tbl_stock] Script Date: 07/13/2007 02:52:14 ******/SET ANSI_NULLS ONGOSET QUOTED_IDENTIFIER ONGOSET ANSI_PADDING ONGOCREATE TABLE [dbo].[tbl_stock]( [Stock_ID] [int] IDENTITY(1,1) NOT NULL, [cat_id] [int] NOT NULL CONSTRAINT [DF__tbl_stock__cat_i__15502E78] DEFAULT ((0)), [sub_cat_id] [int] NULL CONSTRAINT [DF__tbl_stock__sub_c__164452B1] DEFAULT ((0)), [location] [int] NULL CONSTRAINT [DF__tbl_stock__locat__173876EA] DEFAULT ((0)), [n_or_sh] [varchar](50) NULL, [title] [varchar](255) NULL, [description] [varchar](255) NULL, [size] [varchar](50) NULL, [colour] [varchar](50) NULL, [cost_price] [decimal](9, 2) NULL CONSTRAINT [DF__tbl_stock__cost___182C9B23] DEFAULT ((0)), [selling_price] [decimal](9, 2) NULL CONSTRAINT [DF__tbl_stock__selli__1920BF5C] DEFAULT ((0)), [qty] [varchar](50) NULL, [date] [datetime] NULL CONSTRAINT [DF__tbl_stock__date__1A14E395] DEFAULT (getdate()), [condition] [varchar](255) NULL, [notes] [varchar](255) NULL, [visible] [bit] NULL CONSTRAINT [DF__tbl_stock__visib__1B0907CE] DEFAULT ((1)), [picture1] [varchar](50) NULL, [picture1_thumb] [varchar](50) NULL, [picture2] [varchar](50) NULL, [picture2_thumb] [varchar](50) NULL, [picture3] [varchar](50) NULL, [picture3_thumb] [varchar](50) NULL, [picture4] [varchar](50) NULL, [picture4_thumb] [varchar](50) NULL, [display_price] [varchar](50) NULL, [created_by] [varchar](50) NULL, [buying_in_recipt] [varchar](255) NULL, CONSTRAINT [tbl_stock$PrimaryKey] PRIMARY KEY CLUSTERED ( [Stock_ID] ASC)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]) ON [PRIMARY] GO
SET ANSI_PADDING OFF
Regards
Jez
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Feb 23, 2008
I have three tables:
BulkMemberHeader - which has a cascade delete on BulkMemberDetail of any related records
BulkMemberDetail which has a DELETE trigger which gets the member ID from deleted and deletes the member record from the member table
Member
This issue:
> When I delete a record from BulkMemberDetail the trigger fires and deletes the record from the Member table as it should
> If I delete a record from the BulkMemberHeader, all corresponding records in BulkMemberDetail are deleted, but the trigger to delete the record in the Member table does not seem to fire
Is it a limitation on SQLServer 2000 that does not allow triggers to fire in a scenario like this?
Any suggestions or comments would be great.
Thanks,
Mike
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Jul 26, 2004
I have contract table which has built in foreign key constrains. How can I alter this table for delete/ update cascade without recreating the table so whenever studentId/ contactId is modified, the change is effected to the contract table.
Thanks
************************************************** ******
Contract table DDL is
create table contract(
contractNum int identity(1,1) primary key,
contractDate smalldatetime not null,
tuition money not null,
studentId char(4) not null foreign key references student (studentId),
contactId int not null foreign key references contact (contactId)
);
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Aug 25, 2007
Hi how do i to delete a table with a foreign key?
When i try to delete the table i get error 3726
any?
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Dec 6, 2007
Hi,
I am looking to delete a single row from a relatively small table. Unfortunately, there is a foreign key relationship between this table and a much much larger table. The checking of this foreign key when I am deleting this row seems to significantly impact the performance of the operation. Previously there was an index on this larger table that helped this query run. This index has been dropped to improve the performance of a more frequently executed operation.
Is there a way I can use a hint or something to stop SQL checking this foreign key when deleting the row? I am certain that there are no associated rows in the larger table.
I have read elsewhere that I could disable the foreign key, perform the delete, then enable the foreign key. This delete statement is not a one off process and could happen in the normal operation of the application so I don't really know what the implications of doing this are.
Any suggestions would be appreciated.
Thanks
Rich
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May 30, 2006
Hi everyone,
When you've got -for example- a derived column task linked with a Flat file and then you change any field and come back to derived column task again you have select that field
with two possibilities:
1-Leave as invalid column reference /
2-Delete invalid column reference
Its easy when just one is affected but when you have eight or ten is very tedious do the same one by one. Any way for to do same but selecting more than one?
Thanks for any input,
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Jun 29, 2015
I need to delete records from a table (Table1) which has a foreign key column in a related table (Table2).
Table1 columns are: table1Id; Name. Table2 columns include Table2.table1Id which is the foreign key to Table1.
What is the syntax to delete records from Table1 using Table1.Name='some name' and remove any records in Table2 that have Table2.table1Id equal to Table1.table1Id?
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Feb 14, 2007
I have a Sql Server 2005 table with 3 fields, an ID field (primary key), a parent ID field, and Name. The parent ID references the ID field (foreign to primary - many to one) within the same table so that records can reference their parent. I would like to place a cascade delete on the ID field so that when the primary ID is removed it will automatically remove all those records with a parent ID that match. Sql server does not allow me to establish this cascade delete.I was considering a trigger instead but only know how tio use the AFTER paramter and not an alternative. Thanks
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Nov 13, 2007
I am a C# programmer also acting as the dba for a SQL Server project. I have a table called Folder that has child records in a table called FolderItems. When a Folder is deleted I want the FolderItems to be deleted. I know how to accomplish via code, but I would prefer to have SQL Server perform the delete just in case a folder is deleted via SQL Management Studio or other method.
Is a trigger the way to go about this? I know how to create triggers For Delete, but I just wondering is this the best method to create a Cascade delete or does SQL have any built in "Cascade" delete features.
I am using SQL Server 2005 if this matters.
Thank you,
Corby Nichols
Flying Elephant Software
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Mar 7, 2008
Helle people. The question is:
I have two tables: Directories and SubDirectories. SubDirectories table has foreign key for DirectoryId. Now if I define this key with ON DELETE CASCADE attribute then in case of I delete a Directory record, all SubDirectory records will also be deleted. But if I have only one table Directories that have field named ParentId and in this field I save an Id of parent direcory. Can I define a parentId field as a foreign key to the same table and define it with ON DELETE CASCADE? Will it work too? Thanks
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Mar 12, 2008
Hi,
I want to know more about delete cascade feature of SQL Server 2005.
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Jan 25, 2008
Hi, I have the following tables:
Categories {Category_ID, Column2, ...}
Articles { Article_ID, Category_FK, Column3, ...}
Discussions {Discussion_ID, Article_FK, Column3, ...}
Now, all what I have is just category_ID value (Let us say 3), how can I do cascade delete to delete category's record that its ID = 3 and delete all articles and all discussions that found in that category?
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Sep 3, 2002
How to delete a record from a parent table, all relating records in the child tables should also delete.
How to do it by MSSQL 7.0
ANB
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Jul 23, 1999
Is it possible to cascade update and delete while DRI remains there ? That
is without deleteing refrential integrity. If anyone have example of cascade delete and Update using Pubs or Northwind Example , i'll be really obliged.
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Jun 30, 2004
Hi ,
I have 4 GB db with 6 tables,
table A parent of table B with cascade
update,delete
table B parent of C,D,E,F with cascade
update,delete
Today I deleted range of values(7000 rows) from table A, but NOT ALL data
deleted from B,C,D,E,F
Is any limitation for cascade delete
Db set to simple recovery, no errors deleting data
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Aug 4, 1999
Hi everyone,
I would to make a cascade deletion. I dont know how to do it in SQLServer.
Thanks very much.
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May 3, 2006
I am attempting to clarify how the cascade delete works. For example I have a Parent table and two child tables used for lookup that have the ID_FK = ID_PK from the Parent table.
tblUsers
---------------
ID_PK
Fname
Lname
...
tblUser_Phone
----------------
ID_FK
Phone
...
tbUser_Email
----------------
ID_FK
Email
...
If I needed to delete all records from tblUser_Phone would this delete my USER entry from the parent table tblUsers if I have cascade delete enabled?
Thanks in advance.
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Nov 2, 2006
Hi all, I've been reading for a couple of weeks but this is my first question so please be gentle with me.
I'm pretty new to SQL Server, though I've worked with Access for years. I've got four tables (I'm simplifying) and I need to set up cascade deletes between them. I understand how to create foreign keys and all that, but SQL Server is telling me it can't create my keys because it will create multiple cascade paths. I understand that too, I just need to find a way around it. Here are the tables...
dbo.JOBS
Job_Number
dbo.COLUMNS
JOBS_Job_Number
Column_Number
dbo.ROWS
JOBS_Job_Number
Row_Number
dbo.GRID_DATA
JOBS_Job_Number
Column_Number
Row_Number
Data
Currently I have keys set to cascade delete between JOBS>COLUMNS and JOBS>ROWS so that when the user deletes a job, the columns and rows for that job are deleted as well. No problem there.
If the user deletes a column, I have to delete all the grid data for that column and job. Same with rows. So I tried to establish cascade deletes between COLUMNS>GRID_DATA and ROWS>GRID_DATA and that's where I got in trouble. I assume the reason is that if the user deletes a job, it's going to delete the columns and rows, and I've got multiple cascade paths coming from COLUMNS and ROWS to GRID_DATA. I get it.
The question is, what can I do about it? I don't have a cascade delete between JOBS>GRID_DATA, although I do want that behavior, but I was assuming it just would flow through COLUMNS or ROWS. I haven't bothered to add that key as I'm guessing that would just make the situation worse. Anyone got any advice for me on this one?
Thanks!
Ron Moses
ConEst Software Systems
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Jul 23, 2005
Hi. I am trying to log (Not SQL Transaction log) all deleted rowsinto a custome log file after performing "cascade delete".I couldn't find any reference for this in SQL manual or News group.Byung Choi
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Sep 6, 2007
Hi,
I have a Configuration Table tblConfig with 45 fields-
PK_Config_Id
ConfigCreatedOn
ConfigEditedOn
ConfigStartDate
ConfigEndDate
ConfigFor
.
.
.
And an Employee table tblEmployee
PK_Emp_Id
EmpName
.
.
.
I would create a Configuration and then apply this config to some Employees
So, I created a table tblEmployee_Config with 2 fields
FK_Config_Id
FK_Emp_Id
But I MAY need to change(Edit) few of the properties(fields) of the Configuration record associated to an emp. Therefore I need all the fields of tblConfig table along with employee key in tblEmployee_Config
So, I modified tblEmployee_Config to
FK_Emp_Id
FK_Config_Id
ConfigCreatedOn
ConfigEditedOn
ConfigStartDate
ConfigEndDate
ConfigFor
.
.
.
i.e. putting all the fields of the tblConfig into tblEmployee_Config along with emp key
But instead of having 2 almost similar tables (tblConfig and tblEmployee_Config), I merged both the tables into 1 table having Configurations as well as Employees associated to Configs as
PK_Config_Id
FK_Emp_Id
FK_Config_Id
ConfigCreatedOn
ConfigEditedOn
ConfigStartDate
ConfigEndDate
ConfigFor
.
.
. Where FK_Emp_Id and FK_Config_Id would be NULL for Configurations.
Like----
PK_Config_Id FK_Emp_Id FK_Config_Id AllowBrks WorkHrs
1 NULL NULL Yes 9
2 100 1 Yes 9
3 101 1 No 8
Here record 1 is a Configuration and records 2 and 3 are Emps records that are associated to Config 1.
Now my question is
1. Is it correct if I put a relation like
Primary key Foreign Key
tblEmployee_Config tblEmployee_Config
PK_Config_Id FK_Config_Id
2. Can I perform cascade delete on the same table tblEmployee_Config such that
When record 1 is deleted, records 2 and 3 should also get deleted because they refer to the first record?
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Nov 4, 2006
Hi,
I Use SQL Server 2005 Express edition. I have a few tables, which are inter-related. For e.g. I have a project table (ProjectID, Name, ...)
I also have a Project invoice table, in which ProjectID is referred as Foreign key.
Now, I want all the rows in Project invoice (child) table table to be deleted (for a particular ProjetID), if I delete the coresponding ProjectID in Projects (parent) table. If I use the 'on delete set null' or 'on delete cascade' constraint, only the ProjectID (in child table) is nullified whereas rest of the columns have data.
Is there any way out, where the whole ROW (not just that field) is deleted? Or, is it that this can be achieved only by some stored procedure / external program?
Thanks!
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Oct 29, 2015
How to delete records from multiple tables if main table’s entity is deleted as constraints is applied on all..There is this main table called Organization or TblOrganization.and this organization have branches which are in Brach table called tblBranch and this branch have multiple applications let say tblApplication and these application are used by multiple users called tblUsers.What I want is: when I delete the Organization All branches, application and users related to it must be deleted also.How I can apply that on a button click in asp.net web forms..Right now this is my delete function which is very simple
Public void Delete(int? id){
var str=”DELETE FROM tblOrganization WHERE organizationId=”+ id ;
}
And My tables LOOK LIKE this
CREATE TABLE tblOrganization
(
OrganizationId int,
OrganizationName varchar(255)
[code]...
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Jan 15, 2007
Hi, I have a database which saves data about bus links. I want to provide a information to passenger about price of their journay. The price depends on three factors: starting busstop, ending busstop and type of ticket (full, part - for students and old people, ...).
So I created a table with three foreign key constraints (two for busstops and one for type).
When the busstop is deleted or type of ticket I want all data connected with it to be deleted automatically. I wanted to use cascade deleting.
But I receive a following exception: Introducing FOREIGN KEY constraint 'FK_TicketPrices_BusStops1' on table 'TicketPrices' may cause cycles or multiple cascade paths. Specify ON DELETE NO ACTION or ON UPDATE NO ACTION, or modify other FOREIGN KEY constraints.
How can I achieve my task? Why should it cause cycles or multiple cascade paths?
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Sep 20, 2007
I'm using Management Studio Express, is there a way to find out what relationships of a database have cascade delete set to true?
Also is there a way to change the settings (properties) of a relattionship without having to delete it and add it back?
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Apr 12, 2006
I am developing an application with ASP .NET 2.0 using SQL Server 2005. I have a very detailed set of relational tables I would like to use to store my data, however I would like to use the built in Membership functionality of .NET 2.0.What I've done is created MembershipProvider that on user creation links the aspnet_Users table to my custome User table.UserFK guid aspNetId int userIdI then use my own userId to link into other data which uses their PKs to link to other tables, etc, etc like any good relational DB should.My question is when I delete a user using the ASP .NET interface I get a contraint error because my User table references the aspnet_Userts.UserId. I initially wanted to toss Cascade On Delete on my tables which would take care of my problem. I was shocked to find out Sql Server 2005 doesnt support Cascades.. and its suggested that Triggers be used instead (ill durned if im gonna make triggers for all my tables)My question is, what is the best practice in deleting from tabled linked with PK/FK relationships? There MUST be a good way to handle this.thanks
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Nov 2, 2006
I've been handed a database with over 100 tables and told to find everywhere a cascade delete constraint exists. I could just go through every table by hand and check, but I think there must be an easier way, perhaps an sql query on the master db. Any thoughts?
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Jul 23, 2005
I cannot execute my sql to create a table with ON DELETE CASCADE option.Here is my sql:CREATE TABLE Employees (Name Text(10) not null, Age number,CONSTRAINT pkEmployeesPRIMARY KEY (Name)); <--- This is ok!CREATE TABLE CanTake (Name Text(10) not null, Make Text(10) not null,CONSTRAINT pkCanTakePRIMARY KEY (Name, Make),CONSTRAINT fkCanTakeFOREIGN KEY (Name) REFERENCES EmployeesON UPDATE CASCADE <--- MS-ACCESS says 'syntax error'ON DELETE CASCADE);When I didn't include ON UPDATE CASCADE ON DELETE CASCADE in sql, it works(but that's not what I want). Why? Could anyone suggest me?Thank you.--Message posted via http://www.sqlmonster.com
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