I am attempting to only select the 1st row returned from the query. This is my syntax ->

```
insert into @Temp (id, salesID)
select
    RN = ROW_NUMBER() OVER(order by t.psUserID)
    ,t.psUserID
from (
    select distinct 
    psUserID = rstln.Bama   
    From rusticlines rstln  
    AND tnr.Active = '1') t
WHERE RN = 1;

```

And I get the error:

> 
> Msg 207, Level 16, State 1, Line 51  
> 
>  Invalid column name 'RN'.
> 
> 
> 

What do I need to change so that it only selects the 1st row number?