--select * from import_approval

BEGIN TRANSACTION
SET QUOTED_IDENTIFIER ON
SET ARITHABORT ON
SET NUMERIC_ROUNDABORT OFF
SET CONCAT_NULL_YIELDS_NULL ON
SET ANSI_NULLS ON
SET ANSI_PADDING ON
SET ANSI_WARNINGS ON
COMMIT
BEGIN TRANSACTION
GO
ALTER TABLE dbo.Import_approval ADD
	usedweight numeric(18, 6) NULL
GO
ALTER TABLE dbo.Import_approval ADD CONSTRAINT
	DF_Import_approval_usedweight DEFAULT 0 FOR usedweight
GO
ALTER TABLE dbo.Import_approval SET (LOCK_ESCALATION = TABLE)
GO
COMMIT

update Import_approval set usedweight=0