How does one know what a particular trigger or constraint is supposed to be doing on a table. I am just two days old on this position, and no form of documentation, at the same time I am expected to trouble-shoot some error messages. Thanks for your help.
View 3 RepliesWhat are triggers and constraints, if there is a quick answer? Does anyone know of a good ms sql book?
View 1 Replies View RelatedI have several sql server databases that were recently moved to a newserver. In the process of migrating the databases, any triggers andconstraints attached to tables were removed on accident. I need to addthese objects back into the databases, however I'm worried that I willhave problems with referential integrity since there is a chancesomeone may have deleted or updated a record that should have cascadedchanges to other tables but did not since the triggers and constraintswere missing. Is there an easy way to check for problems of thisnature in the databases?Also - I am planning on generating a script from the database on theold server that scripts the triggers and constraints, and then useQuery Analyser to run this script against the database on the newserver. Is this the best way to add these objects back into databasesthat are already populated with data and running on a live server?In in a pretty bad position, but at least these are databases that arenot accessed too frequently, so I'm hoping any referential integrityproblems will be minor.Any help or advice would be greatly appreciated.
View 1 Replies View RelatedI have a question concerning setting up data integrity checks in SQL Server.
I have a table that lists "Groups" to which an Entity belongs. The Entity can belong to multiple Groups. Every entity has 1 and only 1 of its Groups designated as the "Primary Group". Based on this, my table contains multiple records for each Entity. Each record describes 1 Group of which the Entity is a member. In this record, there is a bit field indicating whether the Group is the "Primary Group".
In other DBMS's I have implemented a check constraint on the "Primary Group" column to enforce the business rule that "a Entity may have one and only one Primary Group". I am aware now, that in SQL Server 7, I must implement this rule as a trigger, or in the client or data services layers.
Does anyone know if SQL Server 2000 will allow me to write such a check constraint?
I am thrawn at the deep end
I have been given the task of moving certain tables (that have PK, FK Constraints) from an existing Database (A) to form another Database (B) but making sure all the references to other tables in the original DB (A) are not affected. I was talled that triggers can solve this but I am not sure where to start. The Question is what I am looking for to replace, and how ??
Please help !!!!!!
Saad
Hi, I´m facing teh following situation:This are just sample table names, but should do for discussingpurpouses.Create table Invoice(InvoiceID Integer Not Null,CustomerType Integer Not Null,CustomerCode Integer Not Null,Amount DECIMAL(10,2) Not Null,.................)Create Table Type1Customer(CustomerCode Integer Not Null,...............................)Create Table Type2Customer(CustomerCode Integer Not Null,...............................)I need to add a way to restrict the CustomerType and CustomerCode,in the Invoice table to the correct values.This means that if customerType equals 1 the customerCode should bechecked against Type1Customer and if customerType equals 2 thecustomerCode should be checked against Type2Customer.I succesfully created a check constraint. That ensures that the validvalues exists when the rows in the Invoice table are inserted orupdated, but doesn´t prevent from deleting records from tablesType1Customer and Type2Customer that are referenced from the Invoicetable.Are triggers the only way to go?Thanks in advanceSebastián streiger
View 3 Replies View RelatedI created a snapshot replication and after the first replication process i didn't find the triggers and constraints on the subscription side. what happened ? did i do anything in bad or i can't replicate this objects? This necessary for me because i need to create a testdatabase about the production environment - periodically.
View 3 Replies View RelatedHi fellows,
I have to migrate all objects alogwith all constraints,SP,Triggers, indexes etc from Development instance to Production instance of a DB, all those things are created through wizard ie. Sql server 2000 Enterprise Manager. if i use DTS it only mirates data along with tables and views but constraints,SP,Triggers, indexes etc not yet copied.
can any body help me how can I solve this problem by copying all objects alogwith all constraints,SP,Triggers etc from Development instance to Production instance.
This is Sql server 2000 Cluster environment.
thanks in advance for any help
rahman
I know this is probably a flick of a switch but I cannot figure out which switch. Setup is SQL Server / Stored Procedures / DAL / BLL(skipped for testing) / PL. The stored procedure queries from only one table and two columns are ignored because they are being phased out. I can run the stored procedure and preview the data in the DAL but when I create a page with an ODS linked to the DAL and a GridView I get this error. I checked every column that does not allow nulls and they all have values. I checked unique columns (ID is the only unique and is Identity=Yes in the table definition). I checked foreign-key columns for values that are not in the foreign table and there are none. Any ideas why do I get this?
Failed to enable constraints. One or more rows contain values violating non-null, unique, or foreign-key constraints.
Hi,
I am getting the above error when trying to load a report into my Web Application, I have tracked the error down to one specific field in my database. Even though this field is a NVarChar field and is of size 30 it would seem that there is an issue returning the value from the field. I can write it into the database no problems but when I try to get it out of the database it returns the above error.
e.g
MOB 401.908.804 - Fails
0401.907.324 - okay
8239 9082 (pager) - fails
Anyone got an idea on how to fix this????
Regards..
Peter.
This isn€™t an problem as such, it€™s more of a debate.
If a table needs a number of update triggers which do differing tasks, should these triggers be separated out or encapsulated into one all encompassing trigger. Speaking in terms of performance, it doesn€™t make much of an improvement doing either depending upon the tasks performed. I was wondering in terms of maintenance and best practice etc. My view is that if the triggers do totally differing tasks they should be a trigger each on their own.
www.handleysonline.com
I'm using MS SQL 2000 with enterprise manager I have a customers table called high_customer, it has a primary key called IDI have an invoices table called high_invoices, it has no primary keys but it does have a column for customer ID.I want to set it so if a customer is deleted from the customers table, any invoices with that customerID are deleted from the invoices table.Do I need to specify a constraint? If so how do I do it in enterprise manager.Thanks
View 1 Replies View RelatedHi,
I have the following problem:
I have a table called Jobs with the fields:
JobNumber, Name, Customer, ...
And a table called Customers with the fields:
ID, Name, Address, ...
Obviously Jobs is linked to Customers with the Customer<->ID fields. I want to set it up so that if a Customer is deleted, then any Jobs that had that customer listed now have the Customer field set to NULL. Can I do this with a constraint, or will I need to use a trigger?
Cheers,Little'un
Hello,
I am not a DBA and I need to do the following.
I have 2 tables A and C and both have a common fileds say emp.Emp is pkey in C .
There can be a record in C but not in A.If a record is inserted in A then it checks for the same employee info in C .If not found it do not allow to insert a record in A.
How to go for it?
Thanks!
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
Hiya peops
im creating a constraint using enterprise manager for 1 of my tables n was wondering how u constructively create a constraint expression, there is a specific style,right??
Thanks
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
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.
My table structure is something like this :
ORDER_ITEM (OrderSK, ItemNumber, Qty, ServiceSK, UnitPrice)
SERVICE (ServiceSK, Description, UnitPrice)
How could I modify the database structure to enforce the data constraint that ORDER_ITEM.UnitPrice must be equal to SERVICE.UnitPrice for the corresponding service.
i have a question about constraints in SQL server.
i have three tables:
Client
---------
clientID
name
etc...
Bank
-------
BankID (a virtual number, identity)
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...
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?
Thanks
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
ALTER TABLE users DROP CONSTRAINT dev1
How do I remove any existing default values using script?
TIA,
Seoras.
When I first set up my database, I set it up with many unique constraints, but not much in the way if indexes. After reading more about the benefits of indexes, I'm thinking of deleting many of the unique constraints, and replacing them with unique indexes where appropriate.
It seems that indexes would be better than unique constraints in many cases, because you have the double benefit of enforcing uniqueness, as well as improving sorting capability. Does this make sense?
Hi folks,
Wonder if I'm onto something....everything I've read says that to drop foreign key constraints, you have to drop/recreate the table.
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.
Dan
How do i create a check constraints on column a so it dose not accept $ character? syntax pls.
Thanks
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?
Any response is greatly appreciated.
:cool:
Executed as user: companyadmin user. Violation of PRIMARY KEY constraint 'PK_tblRMAProduct'. Cannot insert duplicate key in object 'tblRMAProduct'. [SQLSTATE 23000] (Error 2627) The statement has been terminated. [SQLSTATE 01000] (Error 3621). The step failed.
View 1 Replies View RelatedHi,
I am developing a database for my company in SQL server 2000 and I have some
few problems.
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
orders that this customer done from the Orders table.
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
two tables:
Customers Orders
--------- ------
CustID (10-003) CustID (10-003)
Name (John) ProductID (33-25)
Address(London) Quantity (2)
. .
. .
etc. etc.
A friend of mine told me that this can be done using Foreign Check constraints
in SQL server. But I do not know what to do.
Can anybody help me please?
Thank you very much.
Efthymios Kalyviotis
ekalyviotis@comerclub.gr
I have a question regarding the use of check constraints. I see how to set it up to make sure a value entered is one of a list using this syntax:
([eft_vc] = 'No' or [eft_vc] = 'Yes')
However, rather than have to hard code the allowable values, I'd like to have them read off another table. The logic would be as follows:
([eft_vc] in (select * from eft_t))
When I try to put this in, I get a message saying that constraints do not support subqueries. Does anyone know of a way around this?
thank you,
Darell
What is the difference between creating a Unique Constraint and Unique Index? How does creating Index/Constraint affect my performance and db size?
Thank you.
Can someone help me with this check constraint. I'm trying to get it runned on MS SQL Server but it seems the syntax isn't correct
check((Derived_Val=0) or ((select count(*) from Stage_One where Task=U_Id and Quantity is null)=0))
Thanx
j2dizzo
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,
ADD CHECK (PaymentTotal > 0), PaymentDate SMALLDATETIME NOT NULL
Can someone give me some good examples of check constraints that I can apply to my fields.
For example can I apply a constraint on a name field, at the moment I use one for the date but would like to know many more.
So if anyone has any useful check constraints handy then please tell.
Thanks
Liz