diff --git a/Tests/dblayerooComplet.php b/Tests/dblayerooComplet.php
index 625de43..945c9eb 100644
--- a/Tests/dblayerooComplet.php
+++ b/Tests/dblayerooComplet.php
@@ -702,4 +702,104 @@ class test_dblayeroo_{ENGINE} extends PHPUnit_Framework_TestCase
     $db2->disconnect ();
     $this->assertSame ("order3", $res);
   }
+
+  public function test_displayAdd_NotFull1 ()
+  {
+    $db1 = $this->db1 ();
+    $db1->displayAdd ("group");
+    $res = $db1->displayGet ();
+    $db1->disconnect ();
+    $this->assertSame (array ("order1" => $db1->sep()."group".$db1->sep()),
+      $res);
+  }
+
+  public function test_displayAdd_NotFull2 ()
+  {
+    $db1 = $this->db1 ();
+    $db1->displayAdd ("distinct group");
+    $res = $db1->displayGet ();
+    $db1->disconnect ();
+    $this->assertSame (array (
+      "order1" => "DISTINCT ".$db1->sep()."group".$db1->sep()), $res);
+  }
+
+  public function test_displayAdd_NotFull3 ()
+  {
+    $db1 = $this->db1 ();
+    $db1->displayAdd ("group_concat ( group ) ");
+    $res = $db1->displayGet ();
+    $db1->disconnect ();
+    $this->assertSame (array (
+      "order1" => "GROUP_CONCAT(".$db1->sep()."group".$db1->sep().")"), $res);
+  }
+
+  public function test_displayAdd_NotFull4 ()
+  {
+    $db1 = $this->db1 ();
+    $db1->displayAdd ("group_concat (distinct group ) ");
+    $res = $db1->displayGet ();
+    $db1->disconnect ();
+    $this->assertSame (array (
+      "order1" => "GROUP_CONCAT(DISTINCT ".
+                  $db1->sep()."group".$db1->sep().")"), $res);
+  }
+
+  public function test_displayAdd_Full1 ()
+  {
+    $db1 = $this->db1 ();
+    $db1->displayAdd ("group");
+    $res = $db1->displayGet (true);
+    $db1->disconnect ();
+    $this->assertSame (array (
+      "order1" => $db1->sep()."groupedoo".$db1->sep().".".
+                  $db1->sep()."group".$db1->sep()),
+      $res);
+  }
+
+  public function test_displayAdd_Full2 ()
+  {
+    $db1 = $this->db1 ();
+    $db1->displayAdd ("distinct group");
+    $res = $db1->displayGet (true);
+    $db1->disconnect ();
+    $this->assertSame (array (
+      "order1" => "DISTINCT ".$db1->sep()."groupedoo".$db1->sep().".".
+                  $db1->sep()."group".$db1->sep()), $res);
+  }
+
+  public function test_displayAdd_Full3 ()
+  {
+    $db1 = $this->db1 ();
+    $db1->displayAdd ("group_concat ( group ) ");
+    $res = $db1->displayGet (true);
+    $db1->disconnect ();
+    $this->assertSame (array (
+      "order1" => "GROUP_CONCAT(".$db1->sep()."groupedoo".$db1->sep().".".
+                                  $db1->sep()."group".$db1->sep().")"), $res);
+  }
+
+  public function test_displayAdd_Full4 ()
+  {
+    $db1 = $this->db1 ();
+    $db1->displayAdd ("group_concat (distinct group ) ");
+    $res = $db1->displayGet (true);
+    $db1->disconnect ();
+    $this->assertSame (array (
+      "order1" => "GROUP_CONCAT(DISTINCT ".
+                  $db1->sep()."groupedoo".$db1->sep().".".
+                  $db1->sep()."group".$db1->sep().")"), $res);
+  }
+
+  public function test_displayAdd_Multiple1 ()
+  {
+    $db1 = $this->db1 ();
+    $db1->displayAdd ("group");
+    $db1->displayAdd ("where");
+    $res = $db1->displayGet ();
+    $db1->disconnect ();
+    $this->assertSame (array ("order1" => $db1->sep()."group".$db1->sep(),
+                              "order2" => $db1->sep()."where".$db1->sep(),),
+                       $res);
+  }
+
 }
diff --git a/dblayeroo.php b/dblayeroo.php
index 0b2dbf4..1ae9cda 100644
--- a/dblayeroo.php
+++ b/dblayeroo.php
@@ -1231,6 +1231,15 @@ class dblayeroo
   }
   /* }}} */
 
+  /** Get the sep property
+    */
+  public function sep ()
+  {
+    /* {{{ */
+    return $this->sep;
+    /* }}} */
+  }
+
   /** Get/Set the dsn property
     * @param string|null $dsn Set the DSN property of PDO
     */
@@ -1557,23 +1566,32 @@ class dblayeroo
           if ($func === "GROUP_CONCAT" && $this->driver === "psql")
             $func = "string_agg";
         }
-        $display = "$func($name)";
       }
-      if (! array_key_exists ($name, $this->fields))
+      $fieldName = $name;
+      $distinct = "";
+      if (stripos ($name, "DISTINCT ") === 0)
+      {
+        $distinct = "DISTINCT ";
+        $fieldName = substr ($name, strlen ("DISTINCT "));
+      }
+      if (! array_key_exists ($fieldName, $this->fields))
        $this->DBException (sprintf (
-         "Invalid field to display '%s' : not defined in table", $name));
+         "Invalid field to display '%s' : not defined in table", $fieldName));
       $getSortOrder = $this->getSortOrder();
       if (! isset ($func))
-        $this->displayColumn[$getSortOrder] = $this->sep.$display.$this->sep;
+        $this->displayColumn[$getSortOrder] =
+          $distinct.$this->sep.$fieldName.$this->sep;
       else
         $this->displayColumn[$getSortOrder] =
-          "$func($this->sep$name$this->sep$separator)";
+          "$func($distinct$this->sep$fieldName$this->sep$separator)";
       if ($this->groupByExpression !== array () && ! isset ($aggregateFunction))
       {
         // Not a aggregate function, but groupBy is set : add the new field name
-        $this->groupByExpression[$getSortOrder] = $this->sep.$name.$this->sep;
+        $this->groupByExpression[$getSortOrder] =
+          $this->sep.$fieldName.$this->sep;
       }
       unset ($aggregateFunction);
+      unset ($func);
     }
     return $this;
   }
@@ -1581,10 +1599,19 @@ class dblayeroo
 
   /** Return the name of the display field, with $this->sep
     * Add the table prefix/name if full is set
-    * Allow name, $this->sep.$name.$this->sep, func(name),
-    * func($this->sep.$name.$this->sep),
-    * func($this->sep.$this->tableprefix.$this->table.$this->sep.".".
-    *      $this->sep.$name.$this->sep)
+    * Allow :
+    *   name,
+    *   DISTINCT name,
+    *   $this->sep.$name.$this->sep,
+    *   DISTINCT $this->sep.$name.$this->sep,
+    *   func(name),
+    *   func(DISTINCT name),
+    *   func($this->sep.$name.$this->sep),
+    *   func(DISTINCT $this->sep.$name.$this->sep),
+    *   func($this->sep.$this->tableprefix.$this->table.$this->sep.".".
+    *        $this->sep.$name.$this->sep)
+    *   func(DISTINCT $this->sep.$this->tableprefix.$this->table.$this->sep.".".
+    *        $this->sep.$name.$this->sep)
     * @param string $name The name of the field
     * @param boolean|null $full Add the table prefix/name if set
     */
@@ -1597,6 +1624,12 @@ class dblayeroo
       $func = strtoupper (trim (substr ($name, 0, $pos)));
       $name = trim (substr ($name, $pos+1, -1));
     }
+    $distinct = "";
+    if (strpos ($name, "DISTINCT ") === 0)
+    {
+      $distinct = "DISTINCT ";
+      $name = substr ($name, strlen ("DISTINCT "));
+    }
     if ($name[0] !== $this->sep)
       $name = $this->sep.$name;
     if (! isset ($func) && substr ($name, -1) !== $this->sep)
@@ -1604,12 +1637,14 @@ class dblayeroo
     if ($full !== false)
       $name = $this->sep.$this->tableprefix.$this->table.$this->sep.".".$name;
     if (isset ($func))
-      $name = "$func($name)";
+      $name = "$func($distinct$name)";
+    else
+      $name = "$distinct$name";
     return $name;
   }
   /* }}} */
 
-  /** Get the columns set in the query by displayColumn. If the $full parameter
+  /** Get the columns set in the query by displayAdd. If the $full parameter
     * is set, add the table prefix/name to the result.
     * If the join object is set, ask to it the columns too
     * @param boolean $full  Add the table prefix/name if set