title: How to return no result?
body: <p>i have following data set</p>
  
  <pre><code>1   CCID        CEID    COM_ID  OSN_zasl_5_special
  2   195540560   3863357 28810   INFO_support
  3   197562575   3863357 8307    LIST_zav_splatky
  4   197307065   3863357 29760   OSN_dat_prvej_spl
  5   197307066   3863357 8508    CS_sprava_kod 6
  6   198284541   3863357 8508    CS_sprava_kod 6
  7   198297147   3863357 29030   CS_sprava_kod 54
  8   199288740   3863357 2121    PA02
  </code></pre>
  
  <p>This is what i need, if "ceid" has comment with id 8307 (com_id) return no result. In other words i have this query</p>
  
  <pre><code>select table.ceid from table
  where table.com_id != 8307
  </code></pre>
  
  <p>But this query will return this ceid, because there exists multiple entries with same ceid which doesn't contain this comment id.</p>
  
  <p>I have tried to group by ceid use stragg on com_id and then stragg(com_id) not like 'com_id' but that doesnt seem to do the trick. Is there </p>