 drop INDEX IX_SitePerson_Person ON [dbo].[SitePerson_Person]
    
alter table  [dbo].[SitePerson_Person]
alter column IsUsed  [int] NULL 


CREATE NONCLUSTERED INDEX [IX_SitePerson_Person] ON [dbo].[SitePerson_Person]
(
	[ProjectId] ASC,
	[UnitId] ASC,
	[IsUsed] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO