The object 'DF.....' is dependent on column 'COL1' . But How?

• Shadab Shah

  SSCarpal Tunnel

  Points: 4759

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  October 10, 2012 at 9:35 am

  #99729

  Hi,

  I was playing with alter table. When i come across this suituation. I tried to figure it out but . Well let me tell you what had i done.

  First i added a new column as :

  Alter Table Demo ADD col1 Int NOT NULL DEFAULT 1

  Then i added a constraint on this column as

  Alter Table Demo Add Constraint PK_demo PrimaryKey(col1,col2)

  Then i played with the data and decided to drop this constraint and bring the table to its original structure. So i proceeded with. I first thought of drooping the constraint which i had created which i did sucessfully as

  Alter Table Demo Drop Constraint PK_Demo

  After that i though of dropping the added column as

  Alter table Demo drop column col1

  but :doze: i got the error which is mention in the subject line.

• Lowell

  SSC Guru

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  October 10, 2012 at 9:44 am

  #1547731

  the part of your script here:

  DEFAULT 1

  Alter Table Demo ADD col1 Int NOT NULL DEFAULT 1

  creates a default constraint ont eh column...so you can't drop teh column until you drop teh constraint on that column.

  sp-help demo will show you all the constraints, and then you can do an explicit drop like this:

  ALTER TABLE demo DROP CONSTRAINT DF__DEMO__2F126280

  to make it easier on yourself, you can add the default constraint with a specific name :

  Alter Table Demo ADD col1 Int NOT NULL

  ALTER TABLE Demo ADD CONSTRIANT DF_Demo_col1_default_value DEFAULT(1) FOR col1

  Lowell

  ---

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• Shadab Shah

  SSCarpal Tunnel

  Points: 4759

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  October 10, 2012 at 9:38 pm

  #1547869

  Thanks Lowell........