diff --git a/classes/question/bank/attempts_column.php b/classes/question/bank/attempts_column.php
index 52e06635..b3327030 100644
--- a/classes/question/bank/attempts_column.php
+++ b/classes/question/bank/attempts_column.php
@@ -47,19 +47,7 @@ class attempts_column extends \core_question\bank\column_base {
      * Initialise Parameters for join
      */
     protected function init() {
-
-        global $DB, $USER, $PAGE;
-        $this->currentuserid = $USER->id;
-        // Build context, categoryid and cmid here for use later.
-        $context = $this->qbank->get_most_specific_context();
-        $this->categoryid = question_get_default_category($context->id)->id;
-        $cmid = $context->instanceid;
-        // TODO: Get StudentQuiz id from infrastructure instead of DB!
-        // TODO: Exception handling lookup fails somehow.
-        $sq = $DB->get_record('studentquiz', array('coursemodule' => $cmid));
-        $this->studentquizid = $sq->id;
-        $this->studentquiz = $sq;
-        // TODO: Sanitize!
+        global $PAGE;
         $this->renderer = $PAGE->get_renderer('mod_studentquiz');
     }
 
@@ -95,8 +83,8 @@ protected function display_content($question, $rowclasses) {
      */
     public function get_extra_joins() {
         return array('sp' => "LEFT JOIN {studentquiz_progress} sp ON sp.questionid = q.id
-                                    AND sp.userid = " . $this->currentuserid . "
-                                    AND sp.studentquizid = " . $this->studentquizid);
+                                    AND sp.userid = current.userid
+                                    AND sp.studentquizid = current.studentquizid");
     }
 
     /**
diff --git a/classes/question/bank/difficulty_level_column.php b/classes/question/bank/difficulty_level_column.php
index 00983c29..9f48e58f 100644
--- a/classes/question/bank/difficulty_level_column.php
+++ b/classes/question/bank/difficulty_level_column.php
@@ -41,22 +41,11 @@ class difficulty_level_column extends \core_question\bank\column_base {
      */
     protected $renderer;
 
-    /** @var \stdClass */
-    protected $studentquiz;
-
     /**
      * Initialise Parameters for join
      */
     protected function init() {
-        global $DB, $USER, $PAGE;
-        $this->currentuserid = $USER->id;
-        $cmid = $this->qbank->get_most_specific_context()->instanceid;
-        // TODO: Get StudentQuiz id from infrastructure instead of DB!
-        // TODO: Exception handling lookup fails somehow.
-        $sq = $DB->get_record('studentquiz', array('coursemodule' => $cmid));
-        $this->studentquizid = $sq->id;
-        $this->studentquiz = $sq;
-        // TODO: Sanitize!
+        global $PAGE;
         $this->renderer = $PAGE->get_renderer('mod_studentquiz');
     }
 
@@ -84,11 +73,10 @@ public function get_extra_joins() {
             return array('dl' => "LEFT JOIN (
                                               SELECT ROUND(1 - AVG(CAST(correctattempts AS DECIMAL) /
                                                        CAST(attempts AS DECIMAL)), 2) AS difficultylevel,
-                                                     questionid
+                                                     questionid, studentquizid
                                                 FROM {studentquiz_progress}
-                                               WHERE studentquizid = " . $this->studentquizid . "
                                             GROUP BY questionid
-                                            ) dl ON dl.questionid = q.id");
+                                            ) dl ON dl.questionid = q.id AND dl.studentquizid = current.studentquizid");
     }
 
     /**
diff --git a/classes/question/bank/rate_column.php b/classes/question/bank/rate_column.php
index 3fa252f0..b5b0f838 100644
--- a/classes/question/bank/rate_column.php
+++ b/classes/question/bank/rate_column.php
@@ -44,14 +44,7 @@ class rate_column extends \core_question\bank\column_base {
      * Initialise Parameters for join
      */
     protected function init() {
-        global $DB, $USER, $PAGE;
-        $this->currentuserid = $USER->id;
-        $cmid = $this->qbank->get_most_specific_context()->instanceid;
-        // TODO: Get StudentQuiz id from infrastructure instead of DB!
-        // TODO: Exception handling lookup fails somehow.
-        $sq = $DB->get_record('studentquiz', array('coursemodule' => $cmid));
-        $this->studentquizid = $sq->id;
-        // TODO: Sanitize!
+        global $PAGE;
         $this->renderer = $PAGE->get_renderer('mod_studentquiz');
     }
 
@@ -93,11 +86,10 @@ public function get_extra_joins() {
                                         GROUP BY questionid
                                         ) vo ON vo.questionid = q.id",
                  'myrate' => "LEFT JOIN (
-                                          SELECT rate AS myrate, q.id AS questionid
+                                          SELECT rate AS myrate, q.id AS questionid, rate.userid
                                             FROM {question} q
                                        LEFT JOIN {studentquiz_rate} rate ON q.id = rate.questionid
-                                                 AND rate.userid = " . $this->currentuserid . "
-                                        ) myrate ON myrate.questionid = q.id");
+                                        ) myrate ON myrate.questionid = q.id AND myrate.userid = current.userid");
     }
 
     /**
diff --git a/classes/question/bank/sq_hidden_column.php b/classes/question/bank/sq_hidden_column.php
index e91ed17b..9dc09f62 100644
--- a/classes/question/bank/sq_hidden_column.php
+++ b/classes/question/bank/sq_hidden_column.php
@@ -101,7 +101,7 @@ protected function display_content($question, $rowclasses) {
      */
     public function get_extra_joins() {
         $hidden = "sqh.hidden = 0";
-        $mine = "q.createdby = $this->currentuserid";
+        $mine = "q.createdby = current.userid";
 
         // Without permission, a user can only see non-hidden question or its their own.
         $sqlextra = "AND ($hidden OR $mine)";
diff --git a/classes/question/bank/studentquiz_bank_view.php b/classes/question/bank/studentquiz_bank_view.php
index 10b55bd7..3a4ccda6 100755
--- a/classes/question/bank/studentquiz_bank_view.php
+++ b/classes/question/bank/studentquiz_bank_view.php
@@ -450,6 +450,13 @@ protected function build_query() {
         $joins = array();
         $fields = array('q.hidden', 'q.category', 'q.timecreated', 'q.createdby');
         $tests = array('q.parent = 0', 'q.hidden = 0');
+
+        // Additional fields for inside comparisons, so columns don't introduce the same variables again. This variant
+        // is chosen since we can't use sql variables multiple times in queries, but this way we can compare against
+        // these variables in any wished way multiple times. Usage example: q.createdby = current.userid, if you want
+        // to know the questions created by the current user
+        $joins["current"] = "JOIN (SELECT {$this->userid} as userid, {$this->studentquiz->id} as studentquizid) current";
+
         foreach ($this->requiredcolumns as $column) {
             $extrajoins = $column->get_extra_joins();
             foreach ($extrajoins as $prefix => $join) {
diff --git a/classes/question/bank/tag_column.php b/classes/question/bank/tag_column.php
index 6f12f941..016eb434 100644
--- a/classes/question/bank/tag_column.php
+++ b/classes/question/bank/tag_column.php
@@ -51,9 +51,7 @@ class tag_column extends \core_question\bank\column_base {
      * Initialise Parameters for join
      */
     protected function init() {
-
-        global $DB, $PAGE;
-
+        global $PAGE;
         // Build context and categoryid here for use later.
         $context = $this->qbank->get_most_specific_context();
         $this->categoryid = question_get_default_category($context->id)->id;