diff --git a/DatabaseMysql.php b/DatabaseMysql.php
index 3705fd3..b9d44dd 100644
--- a/DatabaseMysql.php
+++ b/DatabaseMysql.php
@@ -4,7 +4,7 @@
  * Very stable interface for MySQL - object-oriented at last :)
  * Select builder is inspired by MediaWiki's one.
  * Also usable for querying SphinxQL.
- * Version: 2016-05-28
+ * Version: 2016-09-02
  * (c) Vitaliy Filippov, 2012-2016
  */
 
@@ -480,7 +480,7 @@ class DatabaseMysql implements Database
         $more = NULL;
         $tables = $this->tables_builder($tables, $more);
         if ($more)
-            $where = array_merge($where, $more);
+            $where = array_merge($where, (array)$more);
         $where = $this->where_builder($where);
         $sql = 'SELECT ';
         if (isset($options['CALC_FOUND_ROWS']) || isset($options['SQL_CALC_FOUND_ROWS']))
@@ -579,7 +579,7 @@ class DatabaseMysql implements Database
      *   'table',
      *   'alias' => 'table',
      *   'alias' => array('INNER', 'table_name', $where_for_on_clause),
-     *   'alias' => array('INNER', $nested_tables),
+     *   'alias(ignored)' => array('INNER', $nested_tables, $on_for_join_group),
      * )
      * or just a string "`table1` INNER JOIN `table2` ON ..."
      * names taken into `backticks` will be transformed using $this->tableNames
@@ -601,7 +601,14 @@ class DatabaseMysql implements Database
                 else /* if (!$join || $join == 'inne' || $join == 'join') */
                     $join = 'INNER';
                 if (is_array($v[1])) // nested join (left join (A join B on ...) on ...)
-                    $table = '('.$this->tables_builder($v[1]).')';
+                {
+                    $more = NULL;
+                    $table = $this->tables_builder($v[1], $more);
+                    if ($more)
+                        $v[2] = array_merge((array)$v[2], (array)$more);
+                    if (count($v[1]) > 1)
+                        $table = "($table)";
+                }
                 else
                 {
                     $table = (isset($this->tableNames[$v[1]]) ? $this->quoteId($this->tableNames[$v[1]]) : $v[1]);
diff --git a/DatabasePdoPgsql.php b/DatabasePdoPgsql.php
index 68fe897..7a138f9 100644
--- a/DatabasePdoPgsql.php
+++ b/DatabasePdoPgsql.php
@@ -3,7 +3,7 @@
 /**
  * PDO/PostgreSQL wrapper with (mostly) DatabaseMySQL interface :)
  * Select builder is inspired by MediaWiki's one.
- * Version: 2016-03-25
+ * Version: 2016-09-02
  * (c) Vitaliy Filippov, 2015-2016
  */
 
@@ -168,6 +168,12 @@ class DatabasePdoPgsql implements Database
         $this->queryCount++;
         if ($this->queryLogFile)
             file_put_contents($this->queryLogFile, date("[Y-m-d H:i:s] ").$sql."\n", FILE_APPEND);
+        if (strlen($sql) == 5 && strtoupper($sql) == 'BEGIN')
+            return $this->link->beginTransaction();
+        elseif (strlen($sql) == 8 && strtoupper($sql) == 'ROLLBACK')
+            return $this->link->rollBack();
+        elseif (strlen($sql) == 6 && strtoupper($sql) == 'COMMIT')
+            return $this->link->commit();
         return $this->link->query($sql);
     }
 
@@ -349,7 +355,7 @@ class DatabasePdoPgsql implements Database
         $more = NULL;
         $tables = $this->tables_builder($tables, $more);
         if ($more)
-            $where = array_merge($where, $more);
+            $where = array_merge($where, (array)$more);
         $where = $this->where_builder($where);
         $this->calcFoundRows = isset($options['CALC_FOUND_ROWS']) || isset($options['SQL_CALC_FOUND_ROWS']);
         if ($this->calcFoundRows)
@@ -418,7 +424,7 @@ class DatabasePdoPgsql implements Database
      *   'table',
      *   'alias' => 'table',
      *   'alias' => array('INNER', 'table_name', $where_for_on_clause),
-     *   'alias' => array('INNER', $nested_tables),
+     *   'alias(ignored)' => array('INNER', $nested_tables, $on_for_join_group),
      * )
      * or just a string "table1 INNER JOIN \"table2\" ON ..."
      * escaped names ("table2") will be transformed using $this->tableNames
@@ -442,7 +448,14 @@ class DatabasePdoPgsql implements Database
                 else /* if (!$join || $join == 'inne' || $join == 'join') */
                     $join = 'INNER';
                 if (is_array($v[1])) // nested join (left join (A join B on ...) on ...)
-                    $table = '('.$this->tables_builder($v[1]).')';
+                {
+                    $more = NULL;
+                    $table = $this->tables_builder($v[1], $more);
+                    if ($more)
+                        $v[2] = array_merge((array)$v[2], (array)$more);
+                    if (count($v[1]) > 1)
+                        $table = "($table)";
+                }
                 else
                 {
                     $table = (isset($this->tableNames[$v[1]]) ? $this->quoteId($this->tableNames[$v[1]]) : $v[1]);
@@ -724,11 +737,11 @@ class DatabasePdoPgsql implements Database
     /**
      * Insert or update rows
      */
-    function insert($table, $rows, $onConflict = NULL, $uniqueKey = NULL)
+    function insert($table, $rows, $onConflict = NULL, $uniqueKey = NULL, $updateCols = NULL)
     {
         if (!$rows)
             return false;
-        $sql = $this->insert_builder($table, $rows, $onConflict, $uniqueKey);
+        $sql = $this->insert_builder($table, $rows, $onConflict, $uniqueKey, $updateCols);
         $r = $this->query($sql);
         if ($r)
             return $r->rowCount();