I have two tables, Entity and Arrest. The Entity table is where I store all my people. The arrest table is where I handle criminal arrests. In the arrest table there is multiple FK's to the Entity Table IE (Who was arrested, who did the arresting, and a couple more). If I delete the entity I want to null out all of the entity FK in the arrest table. However, I get error's when I add "On Delete set null" action to the my second FK.
Here is the FK code and the error I get.
ALTER TABLE[arrest].[Arrest] WITH CHECK ADD CONSTRAINT[FK_arrest_TreatedBy] FOREIGN KEY([TreatedBy])
REFERENCES[entity].[Entity]([ID])
ON DELETE SET NULL ON UPDATE NO ACTION
GO
ALTER TABLE[arrest].[Arrest] CHECK CONSTRAINT[FK_arrest_TreatedBy]
GO
ALTER TABLE[arrest].[Arrest] WITH CHECK ADD CONSTRAINT[FK_arrest_arrestee] FOREIGN KEY([Arrestee])
REFERENCES entity.entity([ID])
ON DELETE SET null ON UPDATE NO ACTION
GO
ALTER TABLE[arrest].[Arrest] CHECK CONSTRAINT[FK_arrest_arrestee]
GO
Introducing FOREIGN KEY constraint 'FK_arrest_arrestee' on table 'Arrest' may cause cycles or multiple cascade paths.Specify ON DELETE NO ACTION or ON UPDATE NO ACTION, or modify other FOREIGN KEY constraints.
try to use CASCADE for DELETE ,
UPDATE CASCADE in SQL Server foreign key
Related
Here's the scenario.
- Parent Table: TEAMMEMBERS, with a primary key RecID
- Child Table: TEAMMEMBERTASKS
I have two columns in the TEAMMEMBERTASKS table, ReportedBy and AssignedTo.
Both of these columns use the RecID to store which team member reported a task and which team member the task is assigned to. The RecID could be the same for both columns, but that is not always the case.
I need to add in a FK for both child columns that check the relationship to the parent, and I would like to add ON UPDATE CASCADE to both of the foreign keys.
Whenever I try to do this, my second foreign key throws a 'may cause cycles or multiple cascade paths' error.
Here's my code:
ALTER TABLE [dbo].[TEAMMEMBERTASKS] WITH CHECK ADD CONSTRAINT
[FK_AssignedTo_TeamMemberRecID] FOREIGN KEY([AssignedTo])
REFERENCES [dbo].[TEAMMEMBERS] ([RecID])
GO
ALTER TABLE [dbo].[TEAMMEMBERTASKS] CHECK CONSTRAINT
[FK_AssignedTo_TeamMemberRecID]
GO
ALTER TABLE [dbo].[TEAMMEMBERTASKS] WITH CHECK ADD CONSTRAINT
[FK_ReportedBy_TeamMemberRecID] FOREIGN KEY([ReportedBy])
REFERENCES [dbo].[TEAMMEMBERS] ([RecID])
ON UPDATE CASCADE
GO
ALTER TABLE [dbo].[TEAMMEMBERTASKS] CHECK CONSTRAINT
[FK_ReportedBy_TeamMemberRecID]
GO
With the current code, will this cause the RecID to be updated in both child columns or will it cause the update command to be restricted?
Should I just go ahead and write up a trigger that deals with this instead?
I have a table which is referenced by multiple tables (around 52) and further,few of the child tables have multiple foreign keys also that is referencing other tables too.
I want to delete a record from parent table, I am unable to do so, as I am getting error "The DELETE statement conflicted with the REFERENCE constraint "FK_xxx". The conflict occurred in database "MyDB", table "dbo.A", column 'x'."
I want a generalized T-SQL solution which is irrespective of tables and number of references.
You have to look at the "on delete" keyword which is a part of the foreign key constraint definition.
Basically you have 4 options:
NO ACTION (does nothing)
CASCADE (deletes the child aswell)
SET NULL (sets the reference field to null)
SET DEFAULT (sets the reference field to the default value)
An example would be:
CREATE TABLE parent (
id INT NOT NULL,
PRIMARY KEY (id)
) ENGINE=INNODB;
CREATE TABLE child (
id INT,
parent_id INT,
INDEX par_ind (parent_id),
FOREIGN KEY (parent_id)
REFERENCES parent(id)
ON DELETE CASCADE -- replace CASCADE with your choice
) ENGINE=INNODB;
(for this example and more details look here: http://dev.mysql.com/doc/refman/5.7/en/create-table-foreign-keys.html )
If you now want to modify your constraint, you first have to drop it, and create a new one like for example:
ALTER TABLE child
ADD CONSTRAINT fk_name
FOREIGN KEY (parent_id)
REFERENCES parent(id)
ON DELETE CASCADE; -- replace CASCADE with your choice
I hope this helped. Also to mention it, you should think about maybe not really deleting your parent, and instead creating another boolean column "deleted", which you fill with "yes" if someone clicks the delete. In the "Select"-query you filter then by that "deleted" column.
The advantage is, that you do not lose the history of this entry.
Your problem is this: A FK constraint is designed to prevent you from creating an orphaned child record in any of the 52 tables. I can provide you with the script you seek, but you must realise first that when you try to re-enable the FK constraints the constraints will fail to re-enable because of the orphaned data (which the FK constraints are designed to prevent). For your next step, will have to delete the orphaned data in each of the 52 tables first anyway. It is actually much easier just to redo the constraints with ON DELETE CASCADE, or drop the constraints and forget about referential integrity altogether. You can't have it both ways.
I have a problem with sql server, when I want to have 3 table and make relationship between them, and change the "On Update" property to "cascade".
this problem happend when I want to save the diagram:
Introducing FOREIGN KEY constraint 'FK_Company_Slave' on table 'Company' may cause cycles or multiple cascade paths. Specify ON DELETE NO ACTION or ON UPDATE NO ACTION, or modify other FOREIGN KEY constraints.
Could not create constraint. See previous errors.
in this picture, I define my data base, FK and ....
thanks.
First:
A FOREIGN KEY in one table points to a PRIMARY KEY in another table. if you don't want to use PRIMARY KEY on other table in order to foreign key, you must be create unique index on the table.
Second:
you can create after trigger on Master table in order to develop on update cascade manually. In other word your foreign key between Company table and Master table created without on update cascade and then create following trigger on master to update company table after changed row in Master table.
create trigger triggername on dbo.[Master]
After Insert
AS Begin
Update Company
Set MasterKey = I.MasterKey
From Inserted I
Inner join Deleted D on D.Code = I.Code
Where Company.MasterKey = D.MasterKey
End
I want to delete rows in GlassesColor table that associated with GlassesID in Glasses table.
I want to implement this in stored procedure.The stored procedure gets only one parameter from client side , a CollectionID.
Here are the following tables:
Here is example of tables content:
Any idea how can i implement this?
Thank you in advance!
Manually deleting would be something like this:
delete
from GlassesColor
where GlassesID in (select GlassesID from Glasses where CollectionID = 3)
However, unless this is a one time cleanup, you should start specifying foreign key cascading rules, like the other answers already suggested.
The easiest way is to define FOREIGN KEYS with CASCADE options for DELETE.
http://msdn.microsoft.com/en-us/library/aa933119%28v=sql.80%29.aspx
I see you already have Foreign Keys defined, so you just need to make sure they have CASCADE option for DELETE.
Without stored procedure, use Constrains -> http://www.mssqlcity.com/Articles/General/using_constraints.htm OnDelete Cascade, so when you delete row in Glasses, it will deleted in Glasses color also.
In your foreign key constraint for the GlassesColor join table, have on delete cascade. What that means is when the primary key referenced record is deleted, the corresponding foreign key reference row will also be deleted.
So your GlassesColor table definition would look like this:
create table GlassesColor
(
GlassesId int foreign key references Glasses(GlassesID) on delete cascade,
.....
)
go
I answered something similar for using the INFORMATION_SCHEMA in MSSQL
SQL Server: drop table cascade equivalent?
Here's the easiest way to do it in Microsoft SQL Server: when you create the foreign key constraint, add ON UPDATE CASCADE ON DELETE CASCADE to its definition. I'm assuming you want changes to GlassesID to also propogate. ;-) If not, then you don't need the "ON UPDATE CASCADE".
Example:
ALTER TABLE
[GlassesColor]
WITH CHECK ADD CONSTRAINT
[FK_GlassesColor_GlassesID]
FOREIGN KEY
([glassesID]) REFERENCES [Glasses] ([glassesID])
ON UPDATE CASCADE ON DELETE CASCADE
I'm currently reading through this Yii application eBook: http://www.packtpub.com/agile-web-application-development-yii11-and-php5/book - and I'm having a problem inputting the tutorials DDL / SQL statements into PHPMyAdmin without it throwing up errors.
Would someone be kind enough to shed some light on why the following syntax is invalid? It might be something simple but I can't see it:
SQL statement:
ALTER TABLE tbl_issue
ADD CONSTRAINT FK_issue_project FOREIGN KEY (`project_id`)
REFERENCES tbl_project(`id`) ON DELETE CASCADE ON UPDATE RESTRICT;
ALTER TABLE tbl_issue
ADD CONSTRAINT `FK_issue_owner` FOREIGN KEY (`owner_id`)
REFERENCES tbl_user(`id`) ON DELETE CASCADE ON UPDATE RESTRICT;
ALTER TABLE tbl_issue
ADD CONSTRAINT `FK_issue_requester` FOREIGN KEY (`requester_id`)
REFERENCES tbl_user(`id`) ON DELETE CASCADE ON UPDATE RESTRICT;
ALTER TABLE tbl_project_user_assignment
ADD CONSTRAINT `FK_project_user` FOREIGN KEY (`project_id`)
REFERENCES tbl_project(`id`) ON DELETE CASCADE ON UPDATE RESTRICT;
ALTER TABLE tbl_project_user_assignment
ADD CONSTRAINT `FK_user_project` FOREIGN KEY (`user_id`)
REFERENCES tbl_user(`id`) ON DELETE CASCADE ON UPDATE RESTRICT;
INSERT INTO tbl_user (`email`, `username`, `password`)
VALUES
(`test1#notanaddress.com`,`Test_User_One`, MD5(`test1`)),
(`test2#notanaddress.com`,`Test_User_Two`, MD5(`test2`));
Error Message
Error
SQL query:
ALTER TABLE tbl_issue
ADD CONSTRAINT FK_issue_project FOREIGN KEY ( `project_id` )
REFERENCES tbl_project( `id` ) ON DELETE CASCADE ON UPDATE RESTRICT ;
MySQL said:
#1005 - Can't create table 'trackstar_test.#sql-c78_127' (errno: 121) (<a
href="server_engines.php?engine=InnoDB&page=Status&
token=252c0553975923580ca430b6e98c4243">Details...</a>)
Note:
All the tables in the database are set to innodb as their storage engine.
I've tried using different foreign key names for each FK, still get the same error.
Update:
After finding no solution to the problem, I deleted by DB, uninstalled Xampp and then redid everything again. Seems to work now. Sorry to not be able to tell future readers exactly what the cause was, but it was most probably to do with my Database config or the information I added to it.
Actual Problem is :
AS you are Following the book, there are a few insert/ update statements are executed on
tbl_proect,
tbl_issue
than you are trying to add Foreign Key Constraint. that checks the table data before applying. So, Here is the actual mistake, may be your tables contain a few records that violate the foreign key constraints. hence phpmyadmin doesnot allow you to alter table and generates error message.
Solution :
TRUNCATE TABLE `tbl_project`
TRUNCATE TABLE `tbl_issue`
Do Only one thing, clear all the tables . Empty tables. . And here's your problm resolved now phpmyadmin allows you to run commands.