Is there any way that I can delete inserting entry or block inserting entry into tables. I just want to avoid duplicate entries into system by mistakes.
For instance 

```
**Date_Timing**                **team**         **score**
2016-10-16-10:32:08            baseball            11
2016-10-16-10:32:11            basketball           8
2016-10-16-10:32:12            Soccer              12  
2016-10-16-10:32:14            Soccer              12
2016-10-16-10:32:15            baseball            10
2016-10-16-10:32:16            baseball            10

```

I would like to avoid duplicate entries indicated above. delete automatically any duplicated entries in every 2 seconds should be okay. I have used 

```
delete
    from Sport
    where date_timing >= dateadd(MINUTE, 1,getdate());

```

But did not worked out for me!

Any help would be greatly appreciated.