Check Constraints?

May 4, 2002

Hi,
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

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May 20, 2002

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:

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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:

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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,
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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

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Mar 2, 2006

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Hi
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What is the best way to establish constraints between two columns in a table

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24/1/200712/31/9999124XYZ1
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What kind of constraint or rule will avoid this scenerio.


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I've been thinking about this one for a while but it's just confusing me. How do I create the expression in the constraint for this? Currently I am using SQL Server Management Studio Express so I'm creating this constraint with the gui.

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Oct 27, 2000

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Aug 26, 2005

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

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Jul 20, 2005

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Jan 5, 2007

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Sep 8, 2000

When our DB was converted from 6.5 to 7, the some column check constraints changed
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Is there a way to change them back, short of rebuilding the table? I can't find a syntax
to add a column constraint without adding a column. Some of the affected tables contain
millions of rows, so I'd rather not rebuild them.

When I create a test table with a column and a table check, I see that in sysconstraints
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know if these are real tables or mirages.

create table zzzfoo (
myname char(30) check (myname in ('foo', 'bar')),
myfuzz char(30),
check (myfuzz in ('cotton', 'wool', 'linen'))
)

select sc.* from sysconstraints sc, sysobjects so
where sc.id = (select id from sysobjects where name = 'zzzfoo')
and sc.constid = so.id and so.type = 'C'

constid id colid spare1 status actions error
----------- ----------- ------ ------ ----------- ----------- -----------
1380915991 1364915934 1 0 133140 4096 0
1396916048 1364915934 0 0 133156 4096 0

select * from sysobjects
where id in (select constid from sysconstraints
where id = (select id from sysobjects where name = 'zzzfoo'))

name id xtype uid info status base_schema_ver replinfo parent_obj crdate ftcatid schema_ver stats_schema_ver type userstat sysstat indexdel refdate version deltrig instrig updtrig seltrig category cache
-------------------------------------------------------- ----------- ----- ------ ------ ----------- --------------- ----------- ----------- --------------------------- ------- ----------- ---------------- ---- -------- ------- -------- --------------------------- ----------- ----------- ----------- ----------- ----------- ----------- ------
CK__zzzfoo__myname__524F1B17 1380915991 C 1 1 6 0 0 1364915934 Sep 8 2000 4:29PM 0 0 0 C 0 10 0 Sep 8 2000 4:29PM 0 0 0 0 0 0 0
CK__zzzfoo__53433F50 1396916048 C 1 0 4 0 0 1364915934 Sep 8 2000 4:29PM 0 0 0 C 0 10 0 Sep 8 2000 4:29PM 0 0 0 0 0 0 0

TIA

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Jul 23, 2005

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I have one table like below Test table. My requirement is to create constraints to confirm <g class="gr_ gr_331 gr-alert gr_gramm Grammar only-ins replaceWithoutSep" data-gr-id="331" id="331">uniqueness</g> of STID value 101 with LN.

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(
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)

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In Sql2000 Ok. In Sql2005, if table exists, I get error "invalid column xxxxx" in Add Constraint statement before new column creation.

the code is

Declare @Setup bit

Set @Setup = 1

if @Setup = 1 Begin

--Alter Table MyTable Add MyField Numeric(1, 0) Not Null Default 3

Exec mySp_Add_Column 'MyTable', 'MyField', 'Numeric (1, 0) Not Null', '3'

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End

GO

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Mar 21, 2007

Hi,

I have come across this problem with SQL server both on 2000 and 2005. I am stating an example here.

I have two partitioned tables and a view on top of both tables as below:
create table [dbo].[Table_1]
(
[TableID] INTEGER PRIMARY KEY NONCLUSTERED
CHECK NOT FOR REPLICATION ([TableID] BETWEEN 1 AND 999),
[AnyOtherColumn] int NOT NULL ,
) ON [Primary]
GO

create table [dbo].[Table_2]
(
[TableID] INTEGER PRIMARY KEY NONCLUSTERED
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[AnyOtherColumn] int NOT NULL ,
) ON [Primary]
GO
create view TableView
as
select * from Table_1
union all
select * from Table_2
GO

Note the NOT FOR REPLICATION clause on the check constraint on the TableID column.

I then ran the query execution plan for the following query on both SQL server 2000 and 2005.
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Next, create the same tables and views again, now without the NOT FOR REPLICATION clause on the check constraint as show below:
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(
[TableID] INTEGER PRIMARY KEY NONCLUSTERED
CHECK ([TableID] BETWEEN 1 AND 999),
[AnyOtherColumn] int NOT NULL ,
) ON [Primary]
GO

create table [dbo].[Table_2]
(
[TableID] INTEGER PRIMARY KEY NONCLUSTERED
CHECK ([TableID] BETWEEN 1000 AND 1999),
[AnyOtherColumn] int NOT NULL ,
) ON [Primary]
GO

create view TableView
as
select * from Table_1
union all
select * from Table_2
GO



Now run the query execution plan for the same query again.




select * from TableView where TableID = 10

This time you would see that it does an index scan only on the first parititon table. This time it proves that the partitioning works.

I would like to know why does the NOT FOR REPLICATION clause in the check constraint make such a huge difference?

Is it a bug in SQL server?

Or am I missing any thing?

Any help appreciated.

Thanks

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hi there,

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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
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ALTER TABLE ATTENDANCE
FOREIGN KEY (moduleID) REFERENCES module(moduleID));



insert into ATTENDANCE values
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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
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insert into MODULE values
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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 :

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