sql - Combining and shortening two where clause conditions -

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schema:

create table #exclgeokeys (xkey int); insert #exclgeokeys     values     (1),     (2);  create table #y (name char(1),xkey int); insert #y     values     ('a',1),     ('c',2),     ('d',null),     ('e',3),     ('f',4);

can shorten following produces same result , doesn't need section or xkey null? 

select *   #y  xkey not in                   (                  select *                   #exclgeokeys                  )         or         xkey null;

use option not exists operator

select * #y t not exists (                   select 1                   #exclgeokeys t2                   t.xkey = t2.xkey                   )

demo on sqlfiddle

option exists , except operators

select * #y t exists (               select t.xkey               except               select t2.xkey               #exclgeokeys t2               )

option not exists , intersect operators

select * #y t not exists (                   select t.xkey                   intersect                   select t2.xkey                   #exclgeokeys t2                   )

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