SQL Script To Remove Constraints

Jul 20, 2005

Hi!

I need to write a script that will remove any constraints and triggers from
any table in a specified database.
My problem is that i don't know where are stored in the system tables the
constraints and relations... I've been told that once this would be found,
i would just have to use cursor in order to remove those.
And by the way, i'll need to re-apply the constraints after a couple of
operations on the databases...

Is this something i can possibly do? Do you have any clue or tips for me?
Thanks!

Etienne

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Remove / Set Constraints

Jun 11, 2008

Hi,

There is a master table having a relationship with 3 other tables.

1. Master Table
2. Table 1
3. Table 2
4. Table 3

Table 1 has a foriegn key having a relationp with Master table which has a primary key.

Table 2 has a primary key having a relationp with master table which has a foriegn key.

Table 3 has a primary key having a relationp with master table which has a foriegn key.

Now, there is a prevention of deleteting / truncating data in master table bcoz of having a relationp.

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Pls suggest a suitable solution on this.

Regards,

Srinivas Alwala

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Feb 27, 2001

Hello,
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Feb 5, 2004

Hiya peops!!

Listen i was wondering if anyone could tell me whether they know the correct syntax for creating constraints or where i could find it on the net???


Thanks

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Nov 20, 2007

hi there,

i have added my tables and defined foreig keys and primary keys for my table, but when i try to put the data it gives me some error reagards to parent key..and it wont let me drop the table... can anybody tell me how to drop the foregin key..i have tried (

ALTER TABLE module DROP CONSTRAINT ATTENDANCEID_FK;)
this formula and it wont work,

heres my tables and relationships:


CREATE TABLE ATTENDANCE
(ATTENDANCEID char(4) NOT NULL,
StudID char(4) NOT NULL,
ModuleID char(4) NOT NULL,
Week1 VARCHAR(10),
Week2 VARCHAR(10),
Week3 VARCHAR(10),
Week4 VARCHAR(10),
Week5 VARCHAR(10),
Week6 VARCHAR(10),
PRIMARY KEY (ATTENDANCEID));

ALTER TABLE ATTENDANCE
ADD FOREIGN KEY (studID) REFERENCES student(studID);
ALTER TABLE ATTENDANCE
FOREIGN KEY (moduleID) REFERENCES module(moduleID));



insert into ATTENDANCE values
('F1','A1','E1','Yes','Yes','Yes','Yes','Yes','Yes');
insert into ATTENDANCE values
('F2','A2','E2','Yes','No','Yes','Yes','No','Yes');
insert into ATTENDANCE values
('F3','A3','E2','Yes','Yes','Yes','No','Yes','Yes');
insert into ATTENDANCE values
('F4','A4','E2','Yes','Yes','Yes','Yes','No','Yes');
insert into ATTENDANCE values
('F5','A5','E1''Yes','Yes','No','Yes','Yes','Yes');
insert into ATTENDANCE values
('F6','A6','E2','Yes','Yes','Yes','Yes','Yes','No');
insert into ATTENDANCE values
('F7','A7','E1','Yes','Yes','Yes','Yes','No','No');
insert into ATTENDANCE values
('F8','A8','E2','Yes','Yes','Yes','No','Yes','Yes');
insert into ATTENDANCE values
('F9','A9','E3','Yes','Yes','No','Yes','Yes','Yes');





CREATE TABLE MODULE
(ModuleID char(4) NOT NULL,
ATTENDANCEID char(4) NOT NULL,
ModuleName varchar(45),
ModuleCode varchar(6),
PRIMARY KEY (ModuleID));

ALTER TABLE MODULE
ADD FOREIGN KEY (attendanceID) REFERENCES attendance(attendanceID);


insert into MODULE values
('E1','F1','Workshop Research and Project Implementation','Im3023');
insert into MODULE values
('E2','F2','Advanced Database Development','SD3042');
insert into MODULE values
('E3','F3','Advacned Information Systems Develpment','SD3043');


charles

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Dec 11, 2007

I am fairly new at SQL and also new to this forum. So I don't know if this topic belongs here or not.

But anyways, I found this tutorial online. However, I am having trouble completing it. Can someone please help me?

Given the following table definitions:

CREATE TABLE USERS
(
USERID CHAR(5) PRIMARY KEY,
NAME VARCHAR(30),
RATING CHAR(1) CHECK (RATING IN (A, B,C,D)
)

CREATE TABLE ITEMS
(
ITEM_NO NUMBER PRIMARY KEY,
DESCRIPTION VARCHAR(50),
OFFERED_BY CHAR(5) REFERENCES USERS(USERID) ON UPDATE CASCADE ON DELETE CASCADE,
START_DATE DATETIME,
END_DATE DATETIME,
RESERVE_PRICE NUMBER
)

CREATE TABLE BIDS
(
USERID CHAR(5) REFERENCES USERS ON UPDATE CASCADE ON DELETE SET NULL,
ITEMNO NUMBER REFERENCES ITEMS(ITEM_NO) ON UPDATE CASCADE ON DELETE CASCADE,
BID NUMBER,
BID_DATE DATETIME,
PRIMARY KEY(USERID,ITEMNO,BID_DATE)
)

Directions: Indicate whether the statement is accepted or rejected; and if accepted indicate its effects. Evaluate each statement INDEPENDENTLY.

1) INSERT INTO ITEMS VALUES(1009, Red Bicycle,U01,1999-01-08, 1999-02-10, 30)
2) UPDATE ITEMS SET ITEMNO=1008 where ITEMNO=1001
3) DELETE FROM ITEMS WHERE ITEMNO=1005
4) INSERT INTO ITEMS VALUES(1010, Green Bicycle,U07,1999-01-08, 1999-02-10, 30)
5) UPDATE BIDS SET ITEMNO=1011 WHERE ITEMNO = 1001
6) DELETE FROM USERS WHERE USERID=U01
7) UPDATE ITEMS SET ITEMNO=1020 WHERE ITEMNO=1001
8) DELETE FROM BIDS WHERE BID > 1001


Thanks. I would greatly appreciate your help.

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Dec 7, 2007



My table structure is something like this :

ORDER_ITEM (OrderSK, ItemNumber, Qty, ServiceSK, UnitPrice)
SERVICE (ServiceSK, Description, UnitPrice)


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Jan 23, 2004

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i have three tables:

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---------
clientID
name
etc...


Bank
-------
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ClientID (FK: Client)
BankAccountNumber
BankName

Order
--------
OrderID
ClientID
BankID


a Client an have one or more bankAccounts.. if he place an order, he can select wich bankaccount will be used to pay.

how do i have to set the constraints so that the bankAccount in Order, is allways of THAT client in order.???

Thanx...

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Jul 17, 2004

I have to change someones username in my database in a couple of tables. When I try to make any changes, I get an error that there is a constraint. Is there a way to make the changes without removing all the constraints then replacing them?
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Nov 30, 2001

Hi,

Just getting into scripting sql. I have a little script that adds and drops a default value for a column. But I cannot get it to run when the column already has a default value specified. If I didn't script the contraint and specify a name I have no name to specify when trying to drop it.

ALTER TABLE users ADD CONSTRAINT dev1 DEFAULT 1 FOR ns_email_flag
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How do I remove any existing default values using script?

TIA,

Seoras.

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Apr 30, 2000

Hi folks,
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I've been able to dynamically create the ALTER TABLE statements for all FK constraints in a database. The way I did was a little convoluted (Access 97 linked tables and pass-through queries, cut/paste from the debug window to SQL7 QA), but it does work. More importantly, it saves the hassle of dropping/recreating tables....Someone with more expertise than I in using nested cursors could probably convert it to pure T-SQL pretty easily.

Just curious...opinions? Be glad to post the code here if that's appropriate.

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Dec 1, 2000

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Can anyone recommend a good article/book on the subject? I am trying to find out more about compound primary keys. How many is “too many”? Does the number of primary key columns affect your performance? If so, how does it affect it? Should some of the constraints be handled from stored procedures?

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:cool:

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May 4, 2002

Hi,
I am developing a database for my company in SQL server 2000 and I have some
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Firstly.

I have a customers table and orders table in my DB:

Customers Orders
--------- ------
CustID (primary key) ----------------< CustID
. ^ ProductID
. | Quantity
. | .
. | .
etc. | etc.
|
relationship
(one to many)

What I want to do is:
1) to be able to delete a Customer and automaticaly SQL server delete all the
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2) If for some reason the CustomerID changes, SQL should be able to
automaticaly update the necessary fields with the new values in the Orders
table.
Finally, 3) I want to be able to insert a new customer that has an order
and update both the Customers table and Orders table automaticaly. e.g

CustID Name Address ProductID Quantity etc.
------ ---- ------- --------- -------- ----
10-003 John London 33-25 2 ...

Such a kind of insert should add automaticaly the following entries in the
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Customers Orders
--------- ------
CustID (10-003) CustID (10-003)
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. .
. .
etc. etc.

A friend of mine told me that this can be done using Foreign Check constraints
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Can anybody help me please?

Thank you very much.

Efthymios Kalyviotis
ekalyviotis@comerclub.gr

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May 20, 2002

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thank you,
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Apr 7, 2005

I am Trying to add a check constraint that if the paymenttotal is 0 the column is allowed to have null and if its greater then 0 it is not allow to have null. Here is what I have so far but i get some syntax errors, See if you can see what im doing wrong and how to get this to be valid. Thanks
heres what I got so far


Code:

ALTER TABLE Invoices WITH CHECK
PaymentDate SMALLDATETIME NULL,
CHECK (PaymentTotal = 0)
PaymentDate SMALLDATETIME NOT NULL,
CHECK (PaymentTotal > 0)



I also had this before i changed it to that and I got syntax erros as well but i dunno which is closer.


Code:

ALTER TABLE Invoices [WITH CHECK]
ADD CHECK (PaymentTotal = 0), PaymentDate SMALLDATETIME NULL,
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Hi,

I have relationships built for several tables and I want to bypass the FK restraints when deleting/truncating a table. The FK works fine when some one is trying to delete soemthing within the application, but on an administrative level, it is becoming VERY BOTHERSOME! Any help will be greatly welcomed!

__
Updated 8/24 @ 16:24

I tried a little experiment. I took the constraint off of my two main tables, "manufacturers" and "products". I tried to TRUNCATE the tables again and I got the same error message. My products seems to have other contraints with two other tables. I checked out the two tables and both of them are empty. What's the deal!?! Again, any help is welcomed!

__
Updated 8/24 @ 17:02
Ok so I tried to disable the constraints: ALTER products NOCHECK CONSTRAINT ALL, but it didn't work with truncating.

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Hi,

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