Is there a difference between '=' and In? <p>Is there any differences (perf) writting this request:</p> <pre><code>Select * from T where PK = 1 </code></pre> <p>or this</p> <pre><code>Select * from T where PK in (1) </code></pre> <p>I believe not but i realy don't know how to dispay an execution plan that should assert my feeling.</p> <p>Thx in advance</p>