SQL: special update operation

SQL： Special update operation

Data table code The field accidentally inserts the dimension table （rowid=1） Of desc, To restore .

Data sheet

Dimension table

Create table statement

DROP TABLE IF EXISTS `t1`;
CREATE TABLE `t1`  (
  `id` int(11) NOT NULL,
  `code` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  PRIMARY KEY (`id`) USING BTREE
) ;

INSERT INTO `t1` VALUES (1, 'dd');
INSERT INTO `t1` VALUES (2, 'xx');
INSERT INTO `t1` VALUES (3, 'cc');
INSERT INTO `t1` VALUES (4, ' company ');
INSERT INTO `t1` VALUES (5, ' organization ');
INSERT INTO `t1` VALUES (6, ' department ');
INSERT INTO `t1` VALUES (7, 'dd');
INSERT INTO `t1` VALUES (8, 'xx');
INSERT INTO `t1` VALUES (9, 'cc');
INSERT INTO `t1` VALUES (10, ' company ');
INSERT INTO `t1` VALUES (11, ' organization ');
INSERT INTO `t1` VALUES (12, ' department ');

DROP TABLE IF EXISTS `t2`;
CREATE TABLE `t2`  (
  `id` int(11) NOT NULL,
  `rowid` int(11) NULL DEFAULT NULL,
  `code` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `desc` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  PRIMARY KEY (`id`) USING BTREE
) ;

INSERT INTO `t2` VALUES (1, 1, 'aa', ' company ');
INSERT INTO `t2` VALUES (2, 1, 'bb', ' organization ');
INSERT INTO `t2` VALUES (3, 1, 'yy', ' department ');
INSERT INTO `t2` VALUES (4, 2, 'aa', ' company ');
INSERT INTO `t2` VALUES (5, 2, 'ss', ' organization ');
INSERT INTO `t2` VALUES (6, 2, 'yy', ' department ');

terms of settlement

Query that needs to be updated code, modify desc Corresponding code

UPDATE t1 
SET CODE = ( SELECT t2.CODE FROM t2 WHERE t2.DESC = t1.CODE AND rowid = 1 ) 
WHERE
	t1.CODE IN (
	SELECT
		t2.DESC 
	FROM
		t2 
WHERE
	rowid = 1)