diff --git a/Tests/dblayerooComplet.php b/Tests/dblayerooComplet.php
index 470eb83..aa9c746 100644
--- a/Tests/dblayerooComplet.php
+++ b/Tests/dblayerooComplet.php
@@ -765,8 +765,12 @@ class test_dblayeroo_{ENGINE} extends PHPUnit_Framework_TestCase
     $tbl1->displayAdd ("group_concat ( group ) ");
     $res = $tbl1->displayGet ();
     $tbl1->disconnect ();
-    $this->assertSame (array (
-      "order1" => "GROUP_CONCAT(".$tbl1->sep()."group".$tbl1->sep().")"), $res);
+    if ($this->engine === "pgsql")
+      $this->assertSame (array (
+        "order1" => "string_agg(".$tbl1->sep()."group".$tbl1->sep().")"), $res);
+    else
+      $this->assertSame (array (
+        "order1" => "GROUP_CONCAT(".$tbl1->sep()."group".$tbl1->sep().")"), $res);
   }
 
   public function test_displayAdd_NotFull4 ()
@@ -775,9 +779,14 @@ class test_dblayeroo_{ENGINE} extends PHPUnit_Framework_TestCase
     $tbl1->displayAdd ("group_concat (distinct group ) ");
     $res = $tbl1->displayGet ();
     $tbl1->disconnect ();
-    $this->assertSame (array (
-      "order1" => "GROUP_CONCAT(DISTINCT ".
-                  $tbl1->sep()."group".$tbl1->sep().")"), $res);
+    if ($this->engine === "pgsql")
+      $this->assertSame (array (
+        "order1" => "string_agg(DISTINCT ".
+                    $tbl1->sep()."group".$tbl1->sep().")"), $res);
+    else
+      $this->assertSame (array (
+        "order1" => "GROUP_CONCAT(DISTINCT ".
+                    $tbl1->sep()."group".$tbl1->sep().")"), $res);
   }
 
   public function test_displayAdd_NotFull5 ()
@@ -787,10 +796,16 @@ class test_dblayeroo_{ENGINE} extends PHPUnit_Framework_TestCase
     $tbl1->displayAdd ("group_concat (distinct group ) ", "Group Alias");
     $res = $tbl1->displayGet ();
     $tbl1->disconnect ();
-    $this->assertSame (array (
-      "order1" => "GROUP_CONCAT(DISTINCT ".
-                  $tbl1->sep()."group".$tbl1->sep().") AS ".
-                  $tbl1->sep()."Group Alias".$tbl1->sep()), $res);
+    if ($this->engine === "pgsql")
+      $this->assertSame (array (
+        "order1" => "string_agg(DISTINCT ".
+                    $tbl1->sep()."group".$tbl1->sep().") AS ".
+                    $tbl1->sep()."Group Alias".$tbl1->sep()), $res);
+    else
+      $this->assertSame (array (
+        "order1" => "GROUP_CONCAT(DISTINCT ".
+                    $tbl1->sep()."group".$tbl1->sep().") AS ".
+                    $tbl1->sep()."Group Alias".$tbl1->sep()), $res);
   }
 
   public function test_displayAdd_Full1 ()
@@ -822,9 +837,14 @@ class test_dblayeroo_{ENGINE} extends PHPUnit_Framework_TestCase
     $tbl1->displayAdd ("group_concat ( group ) ");
     $res = $tbl1->displayGet (true);
     $tbl1->disconnect ();
-    $this->assertSame (array (
-      "order1" => "GROUP_CONCAT(".$tbl1->sep()."groupedoo".$tbl1->sep().".".
-                                  $tbl1->sep()."group".$tbl1->sep().")"), $res);
+    if ($this->engine === "pgsql")
+      $this->assertSame (array (
+        "order1" => "string_agg(".$tbl1->sep()."groupedoo".$tbl1->sep().".".
+                                    $tbl1->sep()."group".$tbl1->sep().")"), $res);
+    else
+      $this->assertSame (array (
+        "order1" => "GROUP_CONCAT(".$tbl1->sep()."groupedoo".$tbl1->sep().".".
+                                    $tbl1->sep()."group".$tbl1->sep().")"), $res);
   }
 
   public function test_displayAdd_Full4 ()
@@ -833,10 +853,16 @@ class test_dblayeroo_{ENGINE} extends PHPUnit_Framework_TestCase
     $tbl1->displayAdd ("group_concat (distinct group ) ");
     $res = $tbl1->displayGet (true);
     $tbl1->disconnect ();
-    $this->assertSame (array (
-      "order1" => "GROUP_CONCAT(DISTINCT ".
-                  $tbl1->sep()."groupedoo".$tbl1->sep().".".
-                  $tbl1->sep()."group".$tbl1->sep().")"), $res);
+    if ($this->engine === "pgsql")
+      $this->assertSame (array (
+        "order1" => "string_agg(DISTINCT ".
+                    $tbl1->sep()."groupedoo".$tbl1->sep().".".
+                    $tbl1->sep()."group".$tbl1->sep().")"), $res);
+    else
+      $this->assertSame (array (
+        "order1" => "GROUP_CONCAT(DISTINCT ".
+                    $tbl1->sep()."groupedoo".$tbl1->sep().".".
+                    $tbl1->sep()."group".$tbl1->sep().")"), $res);
   }
 
   public function test_displayAdd_Full5 ()
@@ -846,11 +872,18 @@ class test_dblayeroo_{ENGINE} extends PHPUnit_Framework_TestCase
     $tbl1->displayAdd ("group_concat (distinct group ) ", "Group Alias");
     $res = $tbl1->displayGet (true);
     $tbl1->disconnect ();
-    $this->assertSame (array (
-      "order1" => "GROUP_CONCAT(DISTINCT ".
-                  $tbl1->sep()."groupedoo".$tbl1->sep().".".
-                  $tbl1->sep()."group".$tbl1->sep().") AS ".
-                  $tbl1->sep()."Group Alias".$tbl1->sep()), $res);
+    if ($this->engine === "pgsql")
+      $this->assertSame (array (
+        "order1" => "string_agg(DISTINCT ".
+                    $tbl1->sep()."groupedoo".$tbl1->sep().".".
+                    $tbl1->sep()."group".$tbl1->sep().") AS ".
+                    $tbl1->sep()."Group Alias".$tbl1->sep()), $res);
+    else
+      $this->assertSame (array (
+        "order1" => "GROUP_CONCAT(DISTINCT ".
+                    $tbl1->sep()."groupedoo".$tbl1->sep().".".
+                    $tbl1->sep()."group".$tbl1->sep().") AS ".
+                    $tbl1->sep()."Group Alias".$tbl1->sep()), $res);
   }
 
   public function test_displayAdd_Multiple1 ()
@@ -865,6 +898,7 @@ class test_dblayeroo_{ENGINE} extends PHPUnit_Framework_TestCase
                        $res);
   }
 
+
   public function test_update5 ()
   {
     // Manage to update the non unique fields
@@ -890,4 +924,14 @@ class test_dblayeroo_{ENGINE} extends PHPUnit_Framework_TestCase
                ->execute ();
     $tbl1->disconnect ();
   }
+
+  public function test_displayAdd_ComaFields1 ()
+  {
+    $tbl1 = $this->tbl1 ();
+    $tbl1->displayAdd ("group_concat (group ),group ",
+                       "Group Alias,Group2");
+    $res = $tbl1->select ()
+                ->execute ();
+    $tbl1->disconnect ();
+  }
 }
diff --git a/dblayeroo.php b/dblayeroo.php
index ef8663e..2cf2380 100644
--- a/dblayeroo.php
+++ b/dblayeroo.php
@@ -1595,7 +1595,7 @@ class dblayeroo
             elseif ($this->driver === "mysql")
               $separator = " SEPARATOR '$separator'";
           }
-          if ($func === "GROUP_CONCAT" && $this->driver === "psql")
+          if ($func === "GROUP_CONCAT" && $this->driver === "pgsql")
             $func = "string_agg";
         }
       }
@@ -1655,7 +1655,7 @@ class dblayeroo
     $pos = strpos ($name, "(");
     if ($pos !== false)
     {
-      $func = strtoupper (trim (substr ($name, 0, $pos)));
+      $func = trim (substr ($name, 0, $pos));
       $name = trim (substr ($name, $pos+1, -1));
     }
     $distinct = "";
@@ -2778,6 +2778,7 @@ class dblayeroo
       if ($this->joinObject === null && count ($this->displayGet (false)))
       {
         // Remove the table name as there is no collisions risk
+        // In case of Alias, remove the $this->sep too
         $columns = array ();
         foreach ($this->displayGet (false) as $col)
         {
@@ -2790,6 +2791,12 @@ class dblayeroo
           {
             $col = substr ($col, 0, -1);
           }
+          if (strpos ($col, " AS ".$this->sep))
+          {
+            // remove the separator before the AS
+            $col = substr ($col, 0, strpos ($col, " AS ".$this->sep) -1).
+                   substr ($col, strpos ($col, " AS ".$this->sep));
+          }
           $columns[] = $col;
         }
       }
@@ -2812,9 +2819,16 @@ class dblayeroo
             if (in_array ($func, array ("AVG", "COUNT", "MAX", "MIN", "SUM")))
               $val = intval ($val);
           }
-          elseif (strtolower ($fieldsAll[$columns[$colNb]][0]) ===
-              "integer")
-            $val = intval ($val);
+          else
+          {
+            $name = $columns[$colNb];
+            $pos = strpos ($columns[$colNb], " AS ");
+            if ($pos)
+              $name = substr ($columns[$colNb], 0, $pos);
+            if (strtolower ($fieldsAll[$name][0]) ===
+                "integer")
+              $val = intval ($val);
+          }
           if (($pos = strpos ($columns[$colNb], " AS ".$this->sep)) !== false)
           {
             $pos += strlen (" AS ".$this->sep);