rating MDL-21657 changed inner joins to just joins

lib/db/upgrade.php

@@ -3095,25 +3095,25 @@ function xmldb_main_upgrade($oldversion) {
         //forum ratings only have a single time column so use it for both time created and modified
         $ratingssql = 'SELECT r.id AS rid, r.post AS itemid, r.rating, r.userid, r.time AS timecreated, r.time AS timemodified, f.scale, f.id AS mid
 FROM {forum_ratings} r
-INNER JOIN {forum_posts} p on p.id=r.post
-INNER JOIN {forum_discussions} d on d.id=p.discussion
-INNER JOIN {forum} f on f.id=d.forum';
+JOIN {forum_posts} p on p.id=r.post
+JOIN {forum_discussions} d on d.id=p.discussion
+JOIN {forum} f on f.id=d.forum';
         $result = $result && upgrade_module_ratings($ratingssql,'forum');
 
         //migrate glossary_ratings
         //glossary ratings only have a single time column so use it for both time created and modified
         $ratingssql = 'SELECT r.id AS rid, r.entryid AS itemid, r.rating, r.userid, r.time AS timecreated, r.time AS timemodified, g.scale, g.id AS mid
 FROM {glossary_ratings} r
-INNER JOIN {glossary_entries} ge ON ge.id=r.entryid
-INNER JOIN {glossary} g ON g.id=ge.glossaryid';
+JOIN {glossary_entries} ge ON ge.id=r.entryid
+JOIN {glossary} g ON g.id=ge.glossaryid';
         $result = $result && upgrade_module_ratings($ratingssql,'glossary');
 
         //migrate data_ratings
         //data ratings didnt store time created and modified so Im using the times from the record the rating was attached to
         $ratingssql = 'SELECT r.id AS rid, r.recordid AS itemid, r.rating, r.userid, re.timecreated, re.timemodified, d.scale, d.id AS mid
 FROM {data_ratings} r
-INNER JOIN {data_records} re ON r.recordid=re.id
-INNER JOIN {data} d ON d.id=re.dataid';
+JOIN {data_records} re ON r.recordid=re.id
+JOIN {data} d ON d.id=re.dataid';
         $result = $result && upgrade_module_ratings($ratingssql,'data');
 
         //todo drop forum_ratings, data_ratings and glossary_ratings