Adding Computed Column to an Existing Table

I have this table and need the FacilityID to be a computed column; yes I can drop and recreate but having insert issues with the computed column in place.  This table has all the data now but I need to change the FacilityID to the computed column...

FacilityID as MainID


CREATE TABLE [dbo].[tbl_Facility](
      [FacilityID] [int] NULL,
      [MainID] [int] IDENTITY(1,1) NOT NULL,
      [FACID] [int] NULL,
      [BldID] [int] NULL,
      [BldGrpID] [int] NULL,
      [RoomID] [int] NULL,
      [Facility_Name] [varchar](max) NULL,
      [Facility_Description] [varchar](max) NULL,
      [CenterID] [int] NULL,
      [Building_Nos] [varchar](max) NULL,
      [Rooms] [varchar](max) NULL,
      [Capability] [nvarchar](max) NULL,
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alter table tbl_Facility
add FacilityID as [MainID]
If you convert facilityID to a computed column, it will fail any inserts that specify that field in the insert list.

If you are ok with that.

alter table tbl_facility drop column facilityId
alter table tbl_Facility add FacilityId as MainId

Your statement doesn't define your primary key.  You cannot have a PK on a computed column.

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whoops...brandon is right, you'll need to drop the column first.
Aneesh RetnakaranDatabase AdministratorCommented:
alter table [dbo].[tbl_Facility] drop column [FacilityID]
ALTER TABLE dbo.tbl_Facility ADD FacilityID  AS mainid
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Microsoft SQL Server 2008

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