diff --git a/main/admin/inactive_user_list.php b/main/admin/inactive_user_list.php
index 370a10fe4b..d802fd55ae 100755
--- a/main/admin/inactive_user_list.php
+++ b/main/admin/inactive_user_list.php
@@ -14,7 +14,6 @@ $language_file = array ('registration','admin');
 $cidReset = true;
 require_once '../inc/global.inc.php';
 
-$tbl_stats_access 		= Database :: get_main_table(TABLE_STATISTIC_TRACK_E_ACCESS);
 $this_section = SECTION_PLATFORM_ADMIN;
 api_protect_admin_script(true);
 
diff --git a/main/inc/lib/tracking.lib.php b/main/inc/lib/tracking.lib.php
index 403c9f8613..b23c1ebef0 100755
--- a/main/inc/lib/tracking.lib.php
+++ b/main/inc/lib/tracking.lib.php
@@ -6180,9 +6180,9 @@ class TrackingUserLog
 
     		$sql = "SELECT UNIX_TIMESTAMP(access_date), count(access_date)
                         FROM $track_access_table
-                        WHERE access_user_id = '$user_id'
-                        AND c_id = '$course_id'
-                        AND access_session_id = '$session_id'
+                        WHERE access_user_id = $user_id
+                        AND c_id = $course_id
+                        AND access_session_id = $session_id
                         GROUP BY YEAR(access_date),MONTH(access_date)
                         ORDER BY YEAR(access_date),MONTH(access_date) ASC";
 
@@ -6584,9 +6584,9 @@ class TrackingUserLogCSV
     		$title[1]= get_lang('LoginsAndAccessTools').get_lang('LoginsDetails');
     		$sql = "SELECT UNIX_TIMESTAMP(access_date), count(access_date)
                     FROM $track_access_table
-                    WHERE access_user_id = '$user_id'
-                    AND c_id = '".$course_id."'
-                    AND access_session_id = '$session_id'
+                    WHERE access_user_id = $user_id
+                    AND c_id = $course_id
+                    AND access_session_id = $session_id
                     GROUP BY YEAR(access_date),MONTH(access_date)
                     ORDER BY YEAR(access_date),MONTH(access_date) ASC";
     		//$results = getManyResults2Col($sql);
diff --git a/main/install/db_stats.sql b/main/install/db_stats.sql
index 731927fdc9..30be35ca80 100755
--- a/main/install/db_stats.sql
+++ b/main/install/db_stats.sql
@@ -54,15 +54,13 @@ CREATE TABLE track_e_access (
   access_id int NOT NULL auto_increment,
   access_user_id int unsigned default NULL,
   access_date datetime NOT NULL default '0000-00-00 00:00:00',
-  access_cours_code varchar(40) NOT NULL default '',
   c_id int not null,
   access_tool varchar(30) default NULL,
   access_session_id int NOT NULL default 0,
   user_ip varchar(39) NOT NULL default '',
   PRIMARY KEY  (access_id),
   KEY access_user_id (access_user_id),
-  KEY access_c_id (c_id),
-  KEY access_cours_code (access_cours_code)
+  KEY access_c_id (c_id)
 );
 
 DROP TABLE IF EXISTS track_e_lastaccess;
@@ -70,13 +68,11 @@ CREATE TABLE track_e_lastaccess (
   access_id bigint NOT NULL auto_increment,
   access_user_id int unsigned default NULL,
   access_date datetime NOT NULL default '0000-00-00 00:00:00',
-  access_cours_code varchar(40) NOT NULL,
   c_id int not null,
   access_tool varchar(30) default NULL,
   access_session_id int unsigned default NULL,
   PRIMARY KEY  (access_id),
   KEY access_user_id (access_user_id),
-  KEY access_cours_code (access_cours_code),
   KEY access_c_id (c_id),
   KEY access_session_id (access_session_id)
 );
diff --git a/main/tracking/course_access_details.php b/main/tracking/course_access_details.php
index 6f7a9a5baf..89f72f260c 100755
--- a/main/tracking/course_access_details.php
+++ b/main/tracking/course_access_details.php
@@ -149,7 +149,7 @@ $is_allowedToTrack = $is_courseAdmin;
                 $sql = "SELECT UNIX_TIMESTAMP( access_date )
                         FROM $TABLETRACK_ACCESS
                         WHERE YEAR( access_date ) = YEAR( FROM_UNIXTIME( '$reqdate' ) )
-                        AND c_id = '$courseId'
+                        AND c_id = $courseId
                         AND access_tool IS NULL ";
                 if ($displayType == "month") {
                     $sql .= "ORDER BY UNIX_TIMESTAMP( access_date)";
@@ -172,7 +172,7 @@ $is_allowedToTrack = $is_courseAdmin;
                         FROM $TABLETRACK_ACCESS
                         WHERE MONTH(access_date) = MONTH (FROM_UNIXTIME( '$reqdate' ) )
                         AND YEAR( access_date ) = YEAR( FROM_UNIXTIME( '$reqdate' ) )
-                        AND c_id = '$courseId'
+                        AND c_id = $courseId
                         AND access_tool IS NULL ";
                 if($displayType == "day")
                 {
@@ -194,7 +194,7 @@ $is_allowedToTrack = $is_courseAdmin;
                         WHERE DAYOFMONTH(access_date) = DAYOFMONTH(FROM_UNIXTIME( '$reqdate' ) )
                         AND MONTH(access_date) = MONTH (FROM_UNIXTIME( '$reqdate' ) )
                         AND YEAR( access_date ) = YEAR( FROM_UNIXTIME( '$reqdate' ) )
-                        AND c_id = '$courseId'
+                        AND c_id = $courseId
                         AND access_tool IS NULL
                         ORDER BY HOUR( access_date )";
                 $hours_array = StatsUtils::hoursTab($sql,$reqdate);
diff --git a/main/tracking/logins_details.php b/main/tracking/logins_details.php
index 520d8cb8cb..586d62d0fc 100755
--- a/main/tracking/logins_details.php
+++ b/main/tracking/logins_details.php
@@ -145,8 +145,8 @@ $is_allowedToTrackEverybodyInCourse = $is_courseAdmin; // allowed to track all s
             case "month" :
                 $sql = "SELECT access_date
                         FROM $TABLETRACK_ACCESS
-                        WHERE access_user_id = '$uInfo'
-                        AND c_id = '" . $courseId . "'
+                        WHERE access_user_id = $uInfo
+                        AND c_id = $courseId
                         AND MONTH(access_date) = MONTH( FROM_UNIXTIME('$reqdate') )
                         AND YEAR(access_date) = YEAR(FROM_UNIXTIME('$reqdate'))
                         GROUP BY DAYOFMONTH(access_date)
@@ -156,8 +156,8 @@ $is_allowedToTrackEverybodyInCourse = $is_courseAdmin; // allowed to track all s
             case "week" :
                 $sql = "SELECT access_date
                         FROM $TABLETRACK_ACCESS
-                        WHERE access_user_id = '$uInfo'
-                        AND c_id = '" . $courseId . "'
+                        WHERE access_user_id = $uInfo
+                        AND c_id = $courseId
                         AND WEEK(access_date) = WEEK( FROM_UNIXTIME('$reqdate') )
                         AND YEAR(access_date) = YEAR(FROM_UNIXTIME('$reqdate'))
                         GROUP BY DAYOFMONTH(access_date)
@@ -188,11 +188,11 @@ $is_allowedToTrackEverybodyInCourse = $is_courseAdmin; // allowed to track all s
                 // displayed date is the last login date
                 $sql = "SELECT access_tool, count(access_tool)
                         FROM $TABLETRACK_ACCESS
-                        WHERE access_user_id = '$uInfo'
+                        WHERE access_user_id = $uInfo
                             AND access_tool IS NOT NULL
                             AND access_date > '" . $results[$j] . "'
                             AND access_date < '" . $limit . "'
-                            AND c_id  = '" . $courseId . "'
+                            AND c_id = $courseId
                         GROUP BY access_tool
                         ORDER BY access_tool ASC";
                 $results2 = StatsUtils::getManyResults2Col($sql);
diff --git a/main/tracking/personnalLog.php b/main/tracking/personnalLog.php
index f7b975c4ed..479ea71487 100755
--- a/main/tracking/personnalLog.php
+++ b/main/tracking/personnalLog.php
@@ -123,7 +123,7 @@ api_display_tool_title($nameTools);
                 $sql = "SELECT access_tool, count(access_tool), c_id
                             FROM $TABLETRACK_ACCESS
                             WHERE
-                                access_user_id = '".$_user['user_id']."' AND
+                                access_user_id = " . $_user['user_id'] . " AND
                                 access_date > '".$value."' AND
                                 access_date < '".$previousDate."'
                             GROUP BY access_tool, c_id
diff --git a/plugin/ticket/src/report.php b/plugin/ticket/src/report.php
index 9e991d01a8..103ee2e15d 100755
--- a/plugin/ticket/src/report.php
+++ b/plugin/ticket/src/report.php
@@ -279,7 +279,7 @@ if (isset($_POST['report'])) {
             FROM  " . Database::get_main_table(TABLE_STATISTIC_TRACK_E_ACCESS) . " access
             LEFT JOIN  " . Database::get_main_table(TABLE_MAIN_USER) . " u ON access.access_user_id = u.user_id
             LEFT JOIN  " . Database::get_main_table(TABLE_MAIN_COURSE) . " c ON access.c_id = c.id
-            WHERE access.c_id = '" . $course_info['real_id'] . "' AND u.user_id = '$user_id' ";
+            WHERE access.c_id = " . $course_info['real_id'] . " AND u.user_id = $user_id ";
     if ($tool != '') {
         $sql.="AND access.access_tool = '$tool' ";
     }