IF EXISTS (SELECT 1 FROM SYS.COLUMNS WHERE NAME ='MD5_ARQUIVO' AND OBJECT_ID =OBJECT_ID('EST_SNGPC_RELATORIOS_ANVISA'))
ALTER TABLE [dbo].[EST_SNGPC_RELATORIOS_ANVISA]
ALTER COLUMN [MD5_ARQUIVO] varchar(500) COLLATE SQL_Latin1_General_CP1_CI_AS
GO