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Enter a row with Null

Author

Topic

Adam West
Constraint Violating Yak Guru

261 Posts

Posted - 2009-08-04 : 12:09:20

I have a table of colors for use in a chart.
Right now, not all categories have a color but I want the categories entered into the table with the color as blank but I am getting this error

Cannot insert the value NULL into column 'Color', table 'CDEV_MODS.dbo.Colors'; column does not allow nulls. INSERT fails.
The statement has been terminated.

Transact Charlie
Master Smack Fu Yak Hacker

3451 Posts

Posted - 2009-08-04 : 12:20:17

post your table definition.

How are you implementing the [colors] column? A foreign key to a colours table? or are you denormalised (using VARCHAR and 'BLUE', 'RED') etc.

I'm guessing your column definition doesn't allow nulls (is it the primary key of the table?)

Charlie
===============================================================
Msg 3903, Level 16, State 1, Line 1736
The ROLLBACK TRANSACTION request has no corresponding BEGIN TRANSACTION

Adam West
Constraint Violating Yak Guru

261 Posts

Posted - 2009-08-04 : 12:25:53

Description (varchar (50) not null)
Color (varchar (50) not null)

no keys or indexes. This was setup by an outside developer. What happened was I deleted the rows by accident and have to recreate this.

Transact Charlie
Master Smack Fu Yak Hacker

3451 Posts

Posted - 2009-08-04 : 12:32:19

your column definition says NOT NULL. you can't put NULLS in it.

Check out the ALTER TABLE statement in books online to change this..

You should still be able to put the empty string '' instead but NULL is much more suitable for Not / appropriate / Unkown

Charlie
===============================================================
Msg 3903, Level 16, State 1, Line 1736
The ROLLBACK TRANSACTION request has no corresponding BEGIN TRANSACTION

Adam West
Constraint Violating Yak Guru

261 Posts

Posted - 2009-08-04 : 13:48:01

I tried this but it doesn't compile

ALTER TABLE colors
MODIFY color varchar(50) null

Transact Charlie
Master Smack Fu Yak Hacker

3451 Posts

Posted - 2009-08-05 : 05:09:17

your syntax is wrong.

example:


IF OBJECT_ID('tempdb..#foo') IS NOT NULL DROP TABLE #foo
GO

CREATE TABLE #foo (
	[id] INT IDENTITY(1,1)
	, [val] VARCHAR(50) NOT NULL
	)
go

INSERT #foo ([val])
VALUES (NULL)
GO

ALTER TABLE #foo ALTER COLUMN [val] VARCHAR(50) NULL
GO

INSERT #foo ([val])
VALUES (NULL)
GO

SELECT * FROM #foo

Charlie
===============================================================
Msg 3903, Level 16, State 1, Line 1736
The ROLLBACK TRANSACTION request has no corresponding BEGIN TRANSACTION

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