fixed unit tests for cubrid and postgresql

tests/unit/data/cubrid.sql

@@ -63,8 +63,8 @@ CREATE TABLE `tbl_order_item` (
 );
 
 CREATE TABLE tbl_null_values (
-  `id` INT(11) UNSIGNED NOT NULL AUTO_INCREMENT,
-  `var1` INT UNSIGNED NULL,
+  `id` INT(11) NOT NULL AUTO_INCREMENT,
+  `var1` INT NULL,
   `var2` INT NULL,
   `var3` INT DEFAULT NULL,
   `stringcol` VARCHAR (32) DEFAULT NULL,

tests/unit/data/postgres.sql

@@ -56,8 +56,8 @@ CREATE TABLE tbl_order_item (
 );
 
 CREATE TABLE tbl_null_values (
-  id INT UNSIGNED AUTOINCREMENT NOT NULL,
-  var1 INT UNSIGNED NULL,
+  id INT NOT NULL,
+  var1 INT NULL,
   var2 INT NULL,
   var3 INT DEFAULT NULL,
   stringcol VARCHAR(32) DEFAULT NULL,