tests: add mysql/postgres datas

tests/mysql_data.sql

@@ -25,3 +25,16 @@ INSERT INTO `table_truncate2` (`id`, `delete_me`) VALUES
 (1,	1),
 (2,	1),
 (3,	0);
+
+DROP TABLE IF EXISTS `table_update`;
+CREATE TABLE `table_update` (
+  `id` int NOT NULL AUTO_INCREMENT PRIMARY KEY,
+  `col_string` varchar(255) NULL,
+  `col_bool` int NULL,
+  `col_int` int NULL
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci;
+
+INSERT INTO `table_update` (`id`, `col_string`, `col_bool`, `col_int`) VALUES
+(1,	'foo',	1,	1),
+(2,	'bar',	0,	2),
+(3,	NULL,	NULL,	NULL);