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  <title>How unique are id's?</title>
  <link rel="self" href="https://liferay.dev/c/message_boards/find_thread?p_l_id=119785294&amp;threadId=155514" />
  <subtitle>How unique are id's?</subtitle>
  <id>https://liferay.dev/c/message_boards/find_thread?p_l_id=119785294&amp;threadId=155514</id>
  <updated>2026-04-06T00:27:19Z</updated>
  <dc:date>2026-04-06T00:27:19Z</dc:date>
  <entry>
    <title>RE: How unique are id's?</title>
    <link rel="alternate" href="https://liferay.dev/c/message_boards/find_message?p_l_id=119785294&amp;messageId=174351" />
    <author>
      <name>Jorge Ferrer</name>
    </author>
    <id>https://liferay.dev/c/message_boards/find_message?p_l_id=119785294&amp;messageId=174351</id>
    <updated>2007-09-27T20:10:24Z</updated>
    <published>2007-09-27T20:10:24Z</published>
    <summary type="html">Hi Jeff,&lt;br /&gt;&lt;br /&gt;They are unique for most entities, including the ones you mentioned. Take a look at the values of the Counter table for details.</summary>
    <dc:creator>Jorge Ferrer</dc:creator>
    <dc:date>2007-09-27T20:10:24Z</dc:date>
  </entry>
  <entry>
    <title>How unique are id's?</title>
    <link rel="alternate" href="https://liferay.dev/c/message_boards/find_message?p_l_id=119785294&amp;messageId=155513" />
    <author>
      <name>Jeff G</name>
    </author>
    <id>https://liferay.dev/c/message_boards/find_message?p_l_id=119785294&amp;messageId=155513</id>
    <updated>2007-09-17T20:56:06Z</updated>
    <published>2007-09-17T20:56:06Z</published>
    <summary type="html">Liferay generates ids for objects it manages, so for example a file entry might have a numeric id of 10801. My question is this:&lt;br /&gt;&lt;br /&gt;--&amp;gt; Are these integers unique? &amp;lt;--&lt;br /&gt;&lt;br /&gt;For example, would it be possible for me to have a file entry with id 10801 and a calendar entry with the same number of 10801? This will have some important design ramifications for a system I am writing so I need to know. I cannot find this spelled out anywhere in the documentation.&lt;br /&gt;&lt;br /&gt;Thanks!&lt;br /&gt;&lt;br /&gt;-- j</summary>
    <dc:creator>Jeff G</dc:creator>
    <dc:date>2007-09-17T20:56:06Z</dc:date>
  </entry>
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