sql - Not taking into account condition -

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Suppose i have a parameter @ user id, this can be 0 (no user specified) or own id The structure of the query is as follows: 

  If @UserID & gt; Select 0 ... where UserID = @ UserID ... else if select @userid = 0 ... ou ...   
 What do I need to do the following structure   Select  ... where the user id & gt; 0 then userID = @ USIDID and ignore this condition ...   
 thanks   
 
 
 Set as parameter value instead of 0 (zero)  
  Announce @id int set @id = null * From users (id = @ Id) or (@IID is empty)

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