>Hi,
>
>What works better (better practice) when creating a unique index that is used in FK constraints on child tables? Unique index using this syntax:
>
>

>CREATE UNIQUE INDEX IX_deptfile_cost_cent_site_no ON deptfile (cost_cent, site_no )
>

>
>or creating a constraint using the following syntax:
>
>

>ALTER TABLE [dbo].[deptfile] ADD  CONSTRAINT [IX_deptfile_cost_cent_site_no] UNIQUE NONCLUSTERED 
>(
>	[cost_cent] ASC,
>	[site_no] ASC
>)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
>

>
>?
>

Use CREATE CONSTRAINT as when you create a unique index, the unique constraint is created anyway.
>TIA