diff --git a/actions/favorited.php b/actions/favorited.php
index fd5ff413cb..5082f4a4eb 100644
--- a/actions/favorited.php
+++ b/actions/favorited.php
@@ -169,8 +169,14 @@ class FavoritedAction extends Action
 
     function showContent()
     {
+        if (common_config('db', 'type') == 'pgsql') {
+            $weightexpr='sum(exp(-extract(epoch from (now() - fave.modified)) / %s))';
+        } else {
+            $weightexpr='sum(exp(-(now() - fave.modified) / %s))';
+        }
+
         $qry = 'SELECT notice.*, '.
-          'sum(exp(-(now() - fave.modified) / %s)) as weight ' .
+          $weightexpr . ' as weight ' .
           'FROM notice JOIN fave ON notice.id = fave.notice_id ' .
           'GROUP BY fave.notice_id ' .
           'ORDER BY weight DESC';
diff --git a/lib/groupsbymemberssection.php b/lib/groupsbymemberssection.php
index 4fa07a244a..5f26c6626f 100644
--- a/lib/groupsbymemberssection.php
+++ b/lib/groupsbymemberssection.php
@@ -45,7 +45,7 @@ class GroupsByMembersSection extends GroupSection
 {
     function getGroups()
     {
-        $qry = 'SELECT user_group.*, count(*) as value ' .
+        $qry = 'SELECT user_group.id, count(*) as value ' .
           'FROM user_group JOIN group_member '.
           'ON user_group.id = group_member.group_id ' .
           'GROUP BY user_group.id ' .
diff --git a/lib/groupsbypostssection.php b/lib/groupsbypostssection.php
index a5e33a93de..1a60ddb4fc 100644
--- a/lib/groupsbypostssection.php
+++ b/lib/groupsbypostssection.php
@@ -45,7 +45,7 @@ class GroupsByPostsSection extends GroupSection
 {
     function getGroups()
     {
-        $qry = 'SELECT user_group.*, count(*) as value ' .
+        $qry = 'SELECT user_group.id, count(*) as value ' .
           'FROM user_group JOIN group_inbox '.
           'ON user_group.id = group_inbox.group_id ' .
           'GROUP BY user_group.id ' .
diff --git a/lib/grouptagcloudsection.php b/lib/grouptagcloudsection.php
index f05be85cbb..5d68af28bf 100644
--- a/lib/grouptagcloudsection.php
+++ b/lib/grouptagcloudsection.php
@@ -58,8 +58,14 @@ class GroupTagCloudSection extends TagCloudSection
 
     function getTags()
     {
+        if (common_config('db', 'type') == 'pgsql') {
+            $weightexpr='sum(exp(-extract(epoch from (now() - notice_tag.created)) / %s))';
+        } else {
+            $weightexpr='sum(exp(-(now() - notice_tag.created) / %s))';
+        }
+
         $qry = 'SELECT notice_tag.tag, '.
-          'sum(exp(-(now() - notice_tag.created)/%s)) as weight ' .
+          $weightexpr . ' as weight ' .
           'FROM notice_tag JOIN notice ' .
           'ON notice_tag.notice_id = notice.id ' .
           'JOIN group_inbox on group_inbox.notice_id = notice.id ' .
diff --git a/lib/personaltagcloudsection.php b/lib/personaltagcloudsection.php
index 0882822db2..978153a84e 100644
--- a/lib/personaltagcloudsection.php
+++ b/lib/personaltagcloudsection.php
@@ -58,8 +58,14 @@ class PersonalTagCloudSection extends TagCloudSection
 
     function getTags()
     {
-        $qry = 'SELECT notice_tag.tag, '.
-          'sum(exp(-(now() - notice_tag.created)/%s)) as weight ' .
+        if (common_config('db', 'type') == 'pgsql') {
+            $weightexpr='sum(exp(-extract(epoch from (now() - notice_tag.created)) / %s))';
+        } else {
+            $weightexpr='sum(exp(-(now() - notice_tag.created) / %s))';
+        }
+ 
+       $qry = 'SELECT notice_tag.tag, '.
+          $weightexpr . ' as weight ' .
           'FROM notice_tag JOIN notice ' .
           'ON notice_tag.notice_id = notice.id ' .
           'WHERE notice.profile_id = %d ' .
diff --git a/lib/popularnoticesection.php b/lib/popularnoticesection.php
index c7c7f02150..f7fb935543 100644
--- a/lib/popularnoticesection.php
+++ b/lib/popularnoticesection.php
@@ -48,10 +48,16 @@ class PopularNoticeSection extends NoticeSection
 {
     function getNotices()
     {
-        $qry = 'SELECT notice.*, '.
-          'sum(exp(-(now() - fave.modified) / %s)) as weight ' .
+        if (common_config('db', 'type') == 'pgsql') {
+            $weightexpr='sum(exp(-extract(epoch from (now() - fave.modified)) / %s))';
+        } else {
+            $weightexpr='sum(exp(-(now() - fave.modified) / %s))';
+        }
+
+        $qry = 'SELECT notice.id, '.
+          $weightexpr . ' as weight ' .
           'FROM notice JOIN fave ON notice.id = fave.notice_id ' .
-          'GROUP BY fave.notice_id ' .
+          'GROUP BY notice.id ' .
           'ORDER BY weight DESC';
 
         $offset = 0;