Question

I am using SQL Server 2005.

I have a composite key comprising of these columns:

UserID ….. int

ADate ….. datetime

If I enter two similar dates with different time for a user, it is permitting that record. But I want it to restrict because of similar dates.

How to make it restrict when identical date parts are inserted?

Answer 1

Consider your table

create table tbl (
    userid int,
    adate datetime
)

You can add a COMPUTED column

alter table tbl add adateonly as datediff(d,0,adate);

So that you can create a UNIQUE constraint over it:

alter table tbl add constraint uq_tbl_date unique(userid, adateonly);