diff --git a/phpBB/includes/db/db_tools.php b/phpBB/includes/db/db_tools.php
index f1947ab0d3..7715d2e854 100644
--- a/phpBB/includes/db/db_tools.php
+++ b/phpBB/includes/db/db_tools.php
@@ -1805,7 +1805,7 @@ class phpbb_db_tools
 			break;
 
 			case 'oracle':
-				$statements[] = 'ALTER TABLE ' . $table_name . ' DROP ' . $column_name;
+				$statements[] = 'ALTER TABLE ' . $table_name . ' DROP COLUMN ' . $column_name;
 			break;
 
 			case 'postgres':
@@ -1956,6 +1956,7 @@ class phpbb_db_tools
 					$statements[] = "DROP SEQUENCE {$row['referenced_name']}";
 				}
 				$this->db->sql_freeresult($result);
+			break;
 
 			case 'postgres':
 				// PGSQL does not "tightly" bind sequences and tables, we must guess...
diff --git a/phpBB/includes/db/mssqlnative.php b/phpBB/includes/db/mssqlnative.php
index 2287bc716e..96b4c8a8c8 100644
--- a/phpBB/includes/db/mssqlnative.php
+++ b/phpBB/includes/db/mssqlnative.php
@@ -396,7 +396,7 @@ class dbal_mssqlnative extends dbal
 	*/
 	function sql_affectedrows()
 	{
-		return ($this->db_connect_id) ? @sqlsrv_rows_affected($this->db_connect_id) : false;
+		return (!empty($this->query_result)) ? @sqlsrv_rows_affected($this->query_result) : false;
 	}
 
 	/**