diff --git a/system/database/DB_active_rec.php b/system/database/DB_active_rec.php
index 4620222..076cc7c 100644
--- a/system/database/DB_active_rec.php
+++ b/system/database/DB_active_rec.php
@@ -199,7 +199,7 @@
 			$alias = $this->_create_alias_from_table(trim($select));
 		}
 
-		$sql = $type.'('.$this->_protect_identifiers(trim($select)).') AS '.$alias;
+		$sql = $type.'('.$this->_protect_identifiers(trim($select)).') AS '.$this->_protect_identifiers(trim($alias));
 
 		$this->ar_select[] = $sql;
 
@@ -664,7 +664,11 @@
 
 			$v = $this->escape_like_str($v);
 
-			if ($side == 'before')
+            if ($side == 'none')
+            {
+                $like_statement = $prefix." $k $not LIKE '{$v}'";
+            }
+            elseif ($side == 'before')
 			{
 				$like_statement = $prefix." $k $not LIKE '%{$v}'";
 			}
@@ -1476,7 +1480,7 @@
 		{
 			if ($this->db_debug)
 			{
-				return $this->display_error('db_myst_use_index');
+				return $this->display_error('db_must_use_index');
 			}
 
 			return FALSE;
@@ -2233,4 +2237,4 @@
 }
 
 /* End of file DB_active_rec.php */
-/* Location: ./system/database/DB_active_rec.php */
+/* Location: ./system/database/DB_active_rec.php */
\ No newline at end of file