diff --git a/htdocs/hrm/class/evaluation.class.php b/htdocs/hrm/class/evaluation.class.php
index 2fcce8e468e..7652b2bfd0f 100644
--- a/htdocs/hrm/class/evaluation.class.php
+++ b/htdocs/hrm/class/evaluation.class.php
@@ -228,7 +228,7 @@ class Evaluation extends CommonObject
 		if ($resultcreate > 0) {
 			require_once DOL_DOCUMENT_ROOT . '/hrm/class/skillrank.class.php';
 			$skillRank = new SkillRank($this->db);
-			$TRequiredRanks = $skillRank->fetchAll('ASC', 't.rowid', 0, 0, array('customsql' => 'fk_object='.$this->fk_job.' AND objecttype="job"'));
+			$TRequiredRanks = $skillRank->fetchAll('ASC', 't.rowid', 0, 0, array('customsql' => 'fk_object='.$this->fk_job." AND objecttype='job'"));
 
 			if (is_array($TRequiredRanks) && !empty($TRequiredRanks)) {
 				$this->lines = array();
diff --git a/htdocs/hrm/class/skillrank.class.php b/htdocs/hrm/class/skillrank.class.php
index b6242527178..c2a09936199 100644
--- a/htdocs/hrm/class/skillrank.class.php
+++ b/htdocs/hrm/class/skillrank.class.php
@@ -217,7 +217,7 @@ class SkillRank extends CommonObject
 	{
 		global $langs;
 
-		$sqlfilter = 'fk_object='.$this->fk_object.' AND objecttype="'.$this->objecttype.'" AND fk_skill = '.$this->fk_skill;
+		$sqlfilter = 'fk_object='.$this->fk_object." AND objecttype='".$this->objecttype."' AND fk_skill = ".$this->fk_skill;
 		$alreadyLinked = $this->fetchAll('ASC', 'rowid', 0, 0, array('customsql' => $sqlfilter));
 		if (!empty($alreadyLinked)) {
 			$this->error = $langs->trans('ErrSkillAlreadyAdded');
diff --git a/htdocs/hrm/compare.php b/htdocs/hrm/compare.php
index af41e1bdca1..a42a0e158b5 100644
--- a/htdocs/hrm/compare.php
+++ b/htdocs/hrm/compare.php
@@ -401,13 +401,11 @@ function displayUsersListWithPicto(&$TUser, $fk_usergroup = 0, $namelist = 'list
 
 
 		$sql = "SELECT DISTINCT u.rowid FROM " . MAIN_DB_PREFIX . "user u
-		LEFT JOIN " . MAIN_DB_PREFIX . "usergroup_user ugu ON (u.rowid = ugu.fk_user)
-		WHERE 1
-		AND u.statut > 0
-		AND ugu.fk_usergroup=" . $fk_usergroup;
+		LEFT JOIN " . MAIN_DB_PREFIX . "usergroup_user as ugu ON (u.rowid = ugu.fk_user)
+		WHERE u.statut > 0
+		AND ugu.fk_usergroup=" . ((int)$fk_usergroup);
 
 		$res = $db->query($sql);
-
 		$out .= '<ul name="' . $namelist . '">';
 
 		$TExcludedId = explode(',', $excludedIdsList);
@@ -476,12 +474,12 @@ function getSkillForUsers($TUser)
 	if (empty($TUser)) return array();
 
 	$sql = 'SELECT sk.rowid, sk.label, sk.description, sk.skill_type, sr.fk_object, sr.objecttype, sr.fk_skill, ';
-	$sql.= " MAX(sr.rank) as rank";
-	$sql.=' FROM '.MAIN_DB_PREFIX.'hrm_skill sk';
-	$sql.='	LEFT JOIN '.MAIN_DB_PREFIX.'hrm_skillrank sr ON (sk.rowid = sr.fk_skill)';
-	$sql.='	WHERE sr.objecttype = "'.SkillRank::SKILLRANK_TYPE_USER.'"';
-	$sql.=' AND sr.fk_object IN ('.implode(',', $TUser).')';
-	$sql.=" GROUP BY sk.rowid "; // group par competence
+	$sql.= ' MAX(sr.rank) as "rank"';
+	$sql.= ' FROM '.MAIN_DB_PREFIX.'hrm_skill sk';
+	$sql.= ' LEFT JOIN '.MAIN_DB_PREFIX.'hrm_skillrank sr ON (sk.rowid = sr.fk_skill)';
+	$sql.= " WHERE sr.objecttype = '".SkillRank::SKILLRANK_TYPE_USER."'";
+	$sql.= ' AND sr.fk_object IN ('.implode(',', $TUser).')';
+	$sql.= " GROUP BY sk.rowid, sk.label, sk.description, sk.skill_type, sr.fk_object, sr.objecttype, sr.fk_skill "; // group par competence
 
 	$resql = $db->query($sql);
 	$Tab = array();
@@ -531,12 +529,12 @@ function getSkillForJob($fk_job)
 	if (empty($fk_job)) return array();
 
 	$sql = 'SELECT sk.rowid, sk.label, sk.description, sk.skill_type, sr.fk_object, sr.objecttype, sr.fk_skill, ';
-	$sql.= " MAX(sr.rank) as rank";
+	$sql.= ' MAX(sr.rank) as "rank"';
 	$sql.=' FROM '.MAIN_DB_PREFIX.'hrm_skill sk';
 	$sql.='	LEFT JOIN '.MAIN_DB_PREFIX.'hrm_skillrank sr ON (sk.rowid = sr.fk_skill)';
-	$sql.='	WHERE sr.objecttype = "'.SkillRank::SKILLRANK_TYPE_JOB.'"';
+	$sql.="	WHERE sr.objecttype = '".SkillRank::SKILLRANK_TYPE_JOB."'";
 	$sql.=' AND sr.fk_object IN ('.$fk_job.')';
-	$sql.=' GROUP BY sk.rowid '; // group par competence*/
+	$sql.=' GROUP BY sk.rowid, sk.label, sk.description, sk.skill_type, sr.fk_object, sr.objecttype, sr.fk_skill '; // group par competence*/
 
 	$resql = $db->query($sql);
 	$Tab = array();
diff --git a/htdocs/hrm/evaluation_card.php b/htdocs/hrm/evaluation_card.php
index 172956fc379..05e5af86b8f 100644
--- a/htdocs/hrm/evaluation_card.php
+++ b/htdocs/hrm/evaluation_card.php
@@ -610,17 +610,17 @@ if ($object->id > 0 && (empty($action) || ($action != 'edit' && $action != 'crea
 		$sql .= '  e.ref,';
 		$sql .= '  e.date_creation,';
 		$sql .= '  e.fk_job,';
-		$sql .= '  j.label as refjob,';
+		$sql .= '  j.label as "refjob",';
 		$sql .= '  ed.fk_skill,';
 
-		$sql .= '  sk.label as skilllabel,';
+		$sql .= '  sk.label as "skilllabel",';
 		$sql .= '  sk.skill_type,';
 		$sql .= '  sk.description,';
 		$sql .= '  ed.rank,';
 		$sql .= '  ed.required_rank,';
-		$sql .= '  ed.rank as userRankForSkill,';
-		$sql .= '  skdet_user.description as userRankForSkillDesc,';
-		$sql .= '  skdet_required.description as required_rank_desc';
+		$sql .= '  ed.rank as "userRankForSkill",';
+		$sql .= '  skdet_user.description as "userRankForSkillDesc",';
+		$sql .= '  skdet_required.description as "required_rank_desc"';
 
 		$sql .= '  FROM ' . MAIN_DB_PREFIX . 'hrm_evaluation as e';
 		$sql .= '  LEFT JOIN ' . MAIN_DB_PREFIX . 'hrm_evaluationdet as ed ON  e.rowid = ed.fk_evaluation';
diff --git a/htdocs/hrm/skill_tab.php b/htdocs/hrm/skill_tab.php
index 4ecbc6439be..5e4b33345b7 100644
--- a/htdocs/hrm/skill_tab.php
+++ b/htdocs/hrm/skill_tab.php
@@ -178,7 +178,7 @@ if (empty($reshook)) {
 	} else if ($action == 'saveSkill') {
 		if (!empty($TNote)) {
 			foreach ($TNote as $skillId => $rank) {
-				$TSkills = $skill->fetchAll('ASC', 't.rowid', 0, 0, array('customsql' => 'fk_object=' . $id . ' AND objecttype="' . $objecttype . '" AND fk_skill = ' . $skillId));
+				$TSkills = $skill->fetchAll('ASC', 't.rowid', 0, 0, array('customsql' => 'fk_object=' . $id . " AND objecttype='" . $objecttype . "' AND fk_skill = " . $skillId));
 				if (is_array($TSkills) && !empty($TSkills)) {
 					foreach ($TSkills as $tmpObj) {
 						$tmpObj->rank = $rank;
@@ -283,7 +283,7 @@ if ($object->id > 0 && (empty($action) || ($action != 'edit' && $action != 'crea
 	}
 
 	// table of skillRank linked to current object
-	$TSkillsJob = $skill->fetchAll('ASC', 't.rowid', 0, 0, array('customsql' => 'fk_object=' . $id . ' AND objecttype="' . $objecttype . '"'));
+	$TSkillsJob = $skill->fetchAll('ASC', 't.rowid', 0, 0, array('customsql' => 'fk_object=' . $id . " AND objecttype='" . $objecttype . "'"));
 
 	$TAlreadyUsedSkill = array();
 	if (is_array($TSkillsJob) && !empty($TSkillsJob)) {