Is DEFAULT A Constraint?

Aug 8, 2006

Hi,

I see the following in Books Online: CONSTRAINT--Is an optional keyword
indicating the beginning of a PRIMARY KEY, NOT NULL, UNIQUE, FOREIGN
KEY, or CHECK constraint definition...

But I have a table column defined as follows:

[MONTH] [decimal] (2, 0) NOT NULL CONSTRAINT
[DF__TBLNAME__MONTH__216361A7] DEFAULT (0)

My question: Is "DEFAULT" a constraint, or is it called something else?

Thanks,
Eric

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Jul 26, 2004

Hi,
I need list out the defaulat and constraint value in SQL2K. Where I get those values.
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Jan 2, 2007

A few weeks ago a client asked me to add a column to a table so Icreated this script:ALTER TABLE dbo.tblIndividual ADD fldRenewalStatus BIT NOT NULLCONSTRAINT fldRenewalStatus_Default DEFAULT 0Now they want to change it from a BIT to an INT, to store an enum.Fair enough. However, no matter how much I wrangle with a script, Ican't find a reliable way to alter the column. I've mixed and matchedthe following and nothing seems to work:EXEC sp_unbindefault 'tblIndividual.fldRenewalStatus'DROP DEFAULT DF_tblIndividual_fldRenewalStatusALTER TABLE tblIndividualDROP CONSTRAINT fldRenewalStatus_DefaultALTER TABLE tblIndividualDROP COLUMN fldRenewalStatusGOALTER TABLE tblIndividualADD fldRenewalStatus int NOT NULLCONSTRAINT fldRenewalStatus_Default DEFAULT 0Thoughts?ThanksEdward

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Apr 16, 2008

Hello,

I have a table set up called tbl_DailySummary_new. In that table I have a column called €˜RevType€™ char(2) NOT NULL Default €˜00€™. I'm trying to populate this table from another table called tbl_DailySummary. The RevType column in tbl_DailySummary allows null values (and has them). When I attempt to insert all records from tbl_dailysummary into tbl_DailySummary_new, I get the following error message:


Msg 515, Level 16, State 2, Line 1

Cannot insert the value NULL into column 'RevType', table 'TxnRptg.dbo.tbl_DailySummary_new'; column does not allow nulls. INSERT fails.

The statement has been terminated.


Why dosen€™t the default constraint on the RevType column in the new table pick this up?

Thank you for your help!

cdun2

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Default Constraint Problem

May 20, 2008



Hi ,

I want to define default constraint for a column to force it to UPPER.

USE [GLP]
GO
ALTER TABLE [dbo].[col1] ADD CONSTRAINT [DF_col1_TypeCode] DEFAULT (N'UPPER(col1)') FOR [col1]. Its defined..

But when I tried ti insert into records..It not convertedto uppecase at all...Isn't it possible this way ?

Thanks,
-V

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Apr 28, 2008

Troops,

I'm a software developer trying to hack my way thru a SQL script to increase the size of a column. The column has a constraint on it that won't allow the alter unless its dropped.

Alter command:
ALTER TABLE dbo.QueueBack ALTER Column QBQueue varchar(4) NOT NULL

Message response:
Msg 5074, Level 16, State 1, Line 10
The object 'DF__QueueBack__QBQue__76818E95' is dependent on column 'QBQueue'.
Msg 4922, Level 16, State 9, Line 10
ALTER TABLE ALTER COLUMN QBQueue failed because one or more objects access this column.


So, my script drops the default constraint, alters the column size and then adds the constraint back. The problem is that the constraint does NOT appear to be the same as it was prior. I can run the Alter command on the column and it will allow me to change the size of the column... where it prohibited me from doing such before. How do I restore the default constraint so it is exactly the way it was before I dropped it?

Thx,

Stretch

---------------------------------

Script for drop, alter, add... modified slightly for simplicity...

declare @Error int

BEGIN TRAN
SELECT @Error = 0

DECLARE @defname VARCHAR(100), @cmd VARCHAR(1000)

-- this is retrieved at run time from the sysconstraints table; hard-coded here...
set @defname = 'DF__QueueBack__QBCategory'

IF @defname <> ''
BEGIN
SET @cmd = 'ALTER TABLE dbo.QueueBack DROP CONSTRAINT '+ @defname
EXEC(@cmd)

if @@ERROR = -1
BEGIN
SET @Error = -1
END
END

if @Error = 0
BEGIN
-- modify the column
ALTER TABLE dbo.QueueBack ALTER Column QBCategory varchar(7) NOT NULL

if @@ERROR = -1
BEGIN
SET @Error = -1
END
END

if @Error = 0
BEGIN
-- Add the default constraint back
SET @cmd = 'ALTER TABLE dbo.QueueBack ADD CONSTRAINT '+ @defname + ' DEFAULT ('''') FOR QBCategory'
EXEC(@cmd)

if @@ERROR = -1
BEGIN
SET @Error = -1
END
END


if @Error = 0
BEGIN
-- Commit if no error...
COMMIT TRAN
END
ELSE
BEGIN
-- Rollback if error...
ROLLBACK TRAN
END

GO

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Nov 20, 2007

Okay, maybe I'm getting ahead of myself.
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I'm using it to perform a calculation to a column with a value that the user inserts into another column. (Column1(user input) minus Column2(with Default Value) = Column3(Difference). I just want to read Column2's Default Value for reference so I know whether to change it or not.

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Dec 7, 2001

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Any help would be appreciated.

Sidney Ives

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Oct 26, 2005

Hi guys,

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ALTER TABLE TableTest
ADD CONSTRAINT PRIMARY KEY (C1)


Reading the BOL, it says that if you don't supply a name for the constraint it generates one. But I get this error "Incorrect syntax near the keyword 'PRIMARY'".

If I add a name to the constraint, it works fine.
I'm using SQL Server 2000

Thanks
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Aug 23, 2006

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How can I use Convert function in default constraint?

Thanks!

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Jun 12, 2007

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So if today 6/12/2006, the default value in the Datecolumn should be
6/11/2006.

This gives me a error, i tried but could not fix the bug.

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Alter Constraint DF_DATECOLUMN
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Ashley Rhodes

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Mar 9, 2000

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ADD CONSTRAINT column_name DEFAULT (0)

This gives me a syntax error.

The column was originally added with a default constraint of 1 to a 2.6 million row table.
I dropped the existing constraint and need to add the new default constraint of 0 for that column.

Anyone have any ideas? Thanks in advance.

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Mar 16, 2004

I need to alter the datatype of a column from smallint to decimal (14,2) but the column was originally created with the following:

alter my_table
add col_1 smallintNot Null
constraint df_my_table__col_1 default 0
go

I want to keep the default constraint, but i get errors when I try to do the following to alter the datatype:

alter table my_table
alter column col_1 decimal(14,2)Not Null
go

Do I need to drop the constraint before I alter the column and then rebuild the constraint? An example would be helpful.

Thx

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I tried to delete the constraint by using the query

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Msg 102, Level 15, State 1, Line 2

Incorrect syntax near 'DF__New Item__Pcs_Qt__2D12A970'.

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Oct 26, 2007



Are there any vices to using default constraints on all columns in your table.
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or a char or varchar that defaults to ''

I know that 0 and Null are not the same thing. But if your programs don't have the concept of NULL then you have to convert the NULL to zero.

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Hi, all.

I am trying to create table with following SQL script:





Code Snippet

create table Projects(
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Name nvarchar (255) constraint NN_Prj_Name not null,
Creator nvarchar (255),
CreateDate datetime
);

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Error source: SQL Server Compact ADO.NET Data Provider
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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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Hi,
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Hi,
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Hi, i want to put a contraint on a table which much check agains two values in the same column for the same member.


For example, i don't want a male to get information based on breast cancer, and i don't want a female to get information based on prostate cancer.

I have included some sample data. Just copy and paste.



Code Block

DECLARE @MemberLookupValues TABLE (OptionID INT, ValueID INT, Description VARCHAR(20))
INSERT @MemberLookupValues VALUES (3, 10, 'Male')
INSERT @MemberLookupValues VALUES (3, 11, 'Female')
INSERT @MemberLookupValues VALUES (7, 69, 'Prostate Cancer')
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DECLARE @MemberValues TABLE (MemberID INT, OptionID INT, ValueID INT)
INSERT @MemberValues VALUES (1, 3, 10)
INSERT @MemberValues VALUES (1, 7, 69)
INSERT @MemberValues VALUES (1, 7, 70)
INSERT @MemberValues VALUES (2, 3, 11)
INSERT @MemberValues VALUES (2, 7, 69)

SELECT * FROM @MemberLookupValues
SELECT * FROM @MemberValues






I've highlighted the values that must be stopped.

So the basic check would be, IF OptionID = 3 AND ValueID = 10 then it must not allow you to insert the values OptionID = 7 AND ValueID = 70

I hope that makes sense.

Any help will be greatly appreciated, if you need any more informaiton then just ask,

Kind Regards
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