> CREATE TABLE HartGraph (
>          IDNumb int NOT NULL default 0,
>          HorizMark  int NOT NULL default 0,
> )
> 

the above CREATE TABLE statement will also create you a couple of
default contraints, using automatically generated names. In effect the
above query was run as:

CREATE TABLE HartGraph (
         IDNumb int NOT NULL default 0,
         HorizMark  int NOT NULL CONSTRAINT
DF__HartGrap__Horiz__123EB7A3 default 0,
)

You are going to have to drop the contraint before you can change the column:

ALTER TABLE HartGraph DROP CONSTRAINT  DF__HartGrap__Horiz__123EB7A3

You should then be able to run your alter column statement

ALTER TABLE HartGraph
ALTER COLUMN HorizMark VARCHAR( 20 ) NULL

HTH
Bert

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