<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE data SYSTEM "../../../lib/pkp/dtd/xmlData.dtd">

<!--
  * dbscripts/xml/upgrade/3.1.1_preupdate_citations.xml
  *
  * Copyright (c) 2013-2021 Simon Fraser University
  * Copyright (c) 2003-2021 John Willinsky
  * Distributed under the GNU GPL v3. For full terms see the file docs/COPYING.
  *
  * Pre-update operation regarding citations.
  *
  -->

<data>
	<sql>
		<!-- to be on the safe side, remove citations that are not associated with a submission -->
		<query driver="mysql,mysqli">DELETE FROM cs USING citation_settings cs INNER JOIN citations c ON (cs.citation_id = c.citation_id) WHERE c.assoc_type &lt;&gt; 257</query><!-- ASSOC_TYPE_ARTICLE in OJS 2.4.x -->
		<query driver="postgres,postgres64,postgres7,postgres8,postgres9">DELETE FROM citation_settings cs USING citations c WHERE c.assoc_type &lt;&gt; 257 AND cs.citation_id = c.citation_id</query><!-- ASSOC_TYPE_ARTICLE in OJS 2.4.x -->
		<query>DELETE FROM citations WHERE assoc_type &lt;&gt; 257</query><!-- ASSOC_TYPE_ARTICLE in OJS 2.4.x -->
		<!--  rename the column assoc_id into submission_id -->
		<rename table="citations" column="assoc_id" to="submission_id" />
	</sql>
</data>