Removing Constraints Without Knowing The Constraint Name
Jul 20, 2005
I have the need to remove a constraint on a table since I'm trying to alter
the datatype of one of the columns. I know I can drop the constraint given
the name, but since the name is auto generated (something like
DF__WHRPT_ITV__Expor__45F365D3)
I need a way to find this constraint name so that I can programmatically
remove it.I can get the name using sp_helpconstraint on the table, but can't
seem to locate where the actual constraint_name is stored.
This is on SQL 2000.
Any help is appreciated.
Thanks,
-Gary
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Oct 4, 2007
In SQL Server 2005, I hava a client where I do not have access to their SQL Server. I update the database structure by giving them scripts which they run. As I update the structures I occasionally need to delete a constraint, then typically recreate it later. Usually I use this type of snippet:
IF EXISTS (SELECT * FROM sys.default_constraints
WHERE object_id = OBJECT_ID(N'[dbo].[ConstraintName]')
AND parent_object_id = OBJECT_ID(N'[dbo].[tablename]'))
ALTER TABLE [dbo].[tablename] DROP CONSTRAINT [ConstraintName]
This assumes I know the constraint name. A lot of the older constraints have random type names which I assume are different on their server than mine; they were not explicitly given names when created, so they would heve been given names by SQL Server.
Is there a way to delete a constraint without knowing its name? For example, delete all constraints associated with a field, or all constraints ssociated with a table?
Management Studio is an option, but for my client that involves a higher degree of paperwork and permission seeking than just running a script.
Many thanks,
Mike Thomas
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Oct 4, 2006
hi friends,
for my application i created a table which has a primary key column named num. this table contains this columns only.now i want to remove the column num. when i am tring to remove this column it is throwing the error:
"The object 'PK__Table_Null__023D5A04' is dependent on column 'num'."
so pls guide me on how to delete a primary key column from table.
thanx in advance,
rammohan
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Aug 6, 2007
I have created a simple package to load an Excel Spreadsheet into a SQL Server table. There is a one to one relationship between the columns in the .xls file and the columns in the DB record. I am getting integrity constraint errors when I try to load all numeric data from the spreadsheet (defined as Category General in excel, not defined as numeric but consisting of all numeric characters) into a column defined as (nvarchar(20), not null) in SQL Server Management Studio. There are no constraints on the column.
I have been able to temporarily bypass the offending rows, but I do need to load them into SQL Server. The problem column has a mixture of data, two examples would be: N255, 168050. It's the 168050 value that's causing the Task to bomb. How can I get this loaded into my table ?
I am running the package from within MS Visual Studio 2005 Version 8, Excel is version 2003 (11.8120.8122) SP2
Thanks,
Chris
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Jul 17, 2001
Hello all.
First of all, I've been a reader of swynk.com for quite sometime now, and I'd like to say 'thank you' to everyone who contributes.
Today, I'm the town moron.. haha I'm having issues with column level constraints. I have a varchar(50) where I want to keep *,=,#,/, .. etc, OUT OF the value input. I don't want to strip them. I simply want for sql to throw an error if the insert contains those (and other characters). The only characters that I want in the column are A-Z and 0-9. However, it's not a set number of characters per insert. It always varies... There has to be an easier way to do this than creating a constraint for every possibilty... Any help would be greatly appreciated.
tia,
Jeremy
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Jan 9, 2007
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.
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Jan 17, 2008
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.
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Jan 22, 2004
I'm trying to change the <NULL> fields of my table, but I don't know how to tell the query to look for <NULL>
For example:
select * from MyTable
where fieldx = <NULL>
This doesn't work.
How should it be?
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Sep 16, 2006
Thank you for your help.
I run a website which uses SQL 2000 and VB ASP. I would like to add a section to the site which posts the most popular data being queried from my SQL server. I'm sure this is possible, but I don't know where to start. Please let me know if any of you need specifics regarding my data and set up.
Thanks again for the help! :)
JAC
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Apr 16, 2005
Hi all...
I'm connected to a network with 3 Servers ( 3 sql servers on 3 different machines )
How can i know the name of the servers using SQL Code?
Thanks
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Feb 1, 2006
How can I know how many connections are open at a given point of time while I am testing an ASP.Net application? The application uses SQL Server 2000 as its database.
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Oct 10, 2007
I use SCD to extract and send as output further in the data flow only modified and new records. Before I write to DB and after SCD does its work, I have to execute different controls on both modified and new records. So, I send both SCD outputs (changing attribute updates output and new output ) to a Union All transformation, I execute the needed controls and then I want to insert/update the records in DB.
Is there a way to know which records SCD identified as new/modified after I unified them with a union all transformation? I can create a derivate column for one of the scd outputs and use it in a conditional split before writing to DB but I'd like to know if SCD sends any flags down the dataflow?
Hope I made the problem clear.
Thanx
Sara
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Mar 31, 2006
I've called a resultset from SQL Server
using an SQL Selection. I need to iterate over that entire result set
(200+ columns/fields) and all I need are the random numbers contained
in any of the rows/columns. I don't want to have to name each
field/column and then use an if > 0 statement.Isn't there
some way to generically loop through the column's by index or something
instead of their field name so I can just use an integer loop to walk
the dataset? I know there is I've done it about 5 years ago. The
question is how do you do it in C#?SqlConnection thisConn = new SqlConnection(ConfigurationManager.ConnectionStrings["SQLQuery"].ConnectionString); SqlCommand thisCmd = new SqlCommand("Command String", thisConn); thisCmd.CommandText = "Select * from SelectionsByCountry where [" + DropDownList1.SelectedItem.ToString() + "] > '0'"; thisConn.Open(); SqlDataReader thisReader = null; thisReader = thisCmd.ExecuteReader(CommandBehavior.CloseConnection); while (thisReader.Read()) { DropDownList2.Items.Add(thisReader["System"].ToString().Trim());/*** There are 200+ columns left I want to walk over using a loop structure of some sort. How do I do that?*/ }- Rex
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Jul 23, 2005
I'm working on a VB.NET project where we are intending to use MSDE as ourback-end database. The actual number of users is expected to be low and Idon't have any concerns as to whether MSDE will be up to the job (most ofthe time). I'm aware that if we end up with lots of users connecting to oursite at once (which may happen as certain times in the year when people needinformation for deadlines) then the performance governor in MSDE will kickin and slow everything down.What I don't know is how do I find out whether the performance governor haskicked in?I would like to know how to monitor this so we can make an educated decisionas to when we need to migrate to a full version of SQL Server (if at all).Can anyone point me in the right direction for finding this out?thanks,Brian Cryer.
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Feb 22, 2008
Hi Folks,
Always sorry to have to ask what is most likely such a simple question. However I'm in no way a programmer, I'm just patching something together using scripts I've found all over the shop.
I'm reading in an excel source using a dataflow script component. I build up a SQL String in Vb.Net using the output column names and query the spreadsheet via microsoft.Jet.OLEDB.4.0 then processing it in code. I don't want to use the Excel Source task btw, more for the fact I want to learn from this as well as other less important reasons.
This all works fine. Adding new columns to the output means the query string dynamically changes without the script ever having those columns defined in code. Easy stuff so far.
The issue I have is writing back into the outputbuffer the results without explicitly mapping the result to the output column names.
An easy example to see is..
Excel Spreadsheet Looks like..
ServerName
Server1
Server2
Server3
Output Column Names..
ServerName
Code Snippet..
While Reader.Read
With OutputBuffer
.AddRow()
.ServerName = Reader.GetString(0)
End With
End While
Instead of defining what the column name (servername) is, I want to map back by matching the source column header to the output column name. By doing this I won't ever need to change any code when I add or remove output columns.
Could someone lend a hand with this, and I'll buy you a virtual beer or two. I've already spent more time searching for an answer than I have writing the code thus far, and I think my heads getting more and more muddled by it.
Many thanks,
Jode
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Jun 23, 2006
I need to import few tables from MS Access to MS SQL but the table structure in Access is always different, as I would like the destination table in SQL to be.
Therefore I would like that a table would be created in SQL at runtime, according to the structure the Access table accessed has.
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Jul 20, 2005
I have two tables in my database called CartItems and OrderItems. Istore all of a session's shopping cart items in the CartItems tableusing the sessionID as the identifier (called cartID in my DB). Afteran order is placed and is approved, I would like to copy all of theitems in the CartItems table for that given cartID to the OrderItemstable given a new orderID.I will know the cartID and orderID ahead of time and would like tosend them both into a stored procedure and have the transfer takeplace.Example:take this data...CartItems (table)--------------------------------------cartID | itemID | quantity | price--------------------------------------12345 2 1 12.9512345 7 2 17.95and make it this data...OrderItems (table)--------------------------------------orderID | itemID | quantity | price--------------------------------------00001 2 1 12.9500001 7 2 17.95via some stored procedure that I send (@cartID,@orderID)Any help would be greatly appreciated!!
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May 13, 2008
Hi, all.
I am trying to create table with following SQL script:
Code Snippet
create table Projects(
ID smallint identity (0, 1) constraint PK_Projects primary key,
Name nvarchar (255) constraint NN_Prj_Name not null,
Creator nvarchar (255),
CreateDate datetime
);
When I execute this script I get following error message:
Error source: SQL Server Compact ADO.NET Data Provider
Error message: Named Constraint is not supported for this type of constraint. [ Constraint Name = NN_Prj_Name ]
I looked in the SQL Server Books Online and saw following:
CREATE TABLE (SQL Server Compact)
...
< column_constraint > ::= [ CONSTRAINT constraint_name ] { [ NULL | NOT NULL ] | [ PRIMARY KEY | UNIQUE ] | REFERENCES ref_table [ ( ref_column ) ] [ ON DELETE { CASCADE | NO ACTION } ] [ ON UPDATE { CASCADE | NO ACTION } ]
As I understand according to documentation named constraints should be supported, however error message says opposite. I can rephrase SQL script by removing named constraint.
Code Snippet
create table Projects(
ID smallint identity (0, 1) constraint PK_Projects primary key,
Name nvarchar (255) not null,
Creator nvarchar (255),
CreateDate datetime
);
This script executes correctly, however I want named constraints and this does not satisfy me.
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May 13, 2008
We are using SQL CE 3.5 on tablet PCs, that synchs with our host SQL 2005 Server using Microsoft Synchronization Services. On the tablets, when inserting a record, we get the following error:
A duplicate value cannot be inserted into a unique index. [ Table name = refRegTitle,Constraint name = PK_refRegTitle
But the only PK on this table is RegTitleID.
The table structure is:
[RegTitleID] [int] IDENTITY(1,1) NOT NULL,
[RegTitleNumber] [int] NOT NULL,
[RegTitleDescription] [varchar](200) NOT NULL,
[FacilityTypeID] [int] NOT NULL,
[Active] [bit] NOT NULL,
The problem occurs when a Title Number is inserted and a record with that number already exists. There is no unique constraint on Title Number.
Has anyone else experienced this?
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Apr 27, 2007
I just have done the SSIS example in the tutorial document included when install SQL 2005 ENT. I have a problem that whenever I test to run, the service load all data from source with out noticing about the data (I mean it load all the data to the destination), I do it several time and it continue to load all without checking. That mean the data is dublicated when the schedule run???
I think there should be a paramete or something like that to help the engine just load the new data to the destination. Could you help please?
Thank
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Sep 5, 2015
I was querying to find the first non null address value using the COALESCE function.And I got the correct result.But then I jumped into another question and i.e what if I need to find the column name without knowing the column nameand just by using the column value.What I mean is this...My query was.....
SELECT COALESCE(AddressLine1,AddressLine2) AS [Addresss] FROM Person.Address
This is what I got.
Address#500-75 O'Connor Street#9900 2700 Production Way00, rue Saint-Lazare02, place de Fontenoy035, boulevard du Montparnasse081, boulevard du Montparnasse081, boulevard du Montparnasse084, boulevard du Montparnasse1 Corporate Center Drive1 Mt. Dell Drive
But then what if I just know the address of that person i.e #500-75 O'Connor Street..How am I suppose to retrieve that without knowing the column name.
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Oct 15, 2006
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
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Apr 27, 2005
Hi,
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
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Feb 27, 2001
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!
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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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Feb 5, 2004
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
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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)
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.
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Jan 23, 2004
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...
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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?
Thanks
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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
ALTER TABLE users DROP CONSTRAINT dev1
How do I remove any existing default values using script?
TIA,
Seoras.
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May 4, 2001
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.
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