解决MySQL报错:You can‘t specify target table ‘region‘ for update in FROM clause

DROP TABLE IF EXISTS `region`;
CREATE TABLE `region`
(
    `Id`     int(11) NOT NULL COMMENT '主键id',
    `Name`   varchar(40) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '名称',
    `Pid`    int(11) NULL DEFAULT NULL COMMENT '父类id',
    `status` varchar(2) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT '1' COMMENT '1:启用,2:禁用',
    PRIMARY KEY (`Id`) USING BTREE,
    INDEX    `FK_CHINA_REFERENCE_CHINA`(`Pid`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci COMMENT = '省市区表' ROW_FORMAT = DYNAMIC;

UPDATE region SET pid = (select pid FROM region WHERE NAME = '市辖区') where name='北京';

UPDATE region SET pid = (select id FROM banner) ;

UPDATE region 
SET pid = ( SELECT a.pid FROM ( SELECT Pid FROM region WHERE NAME = '市辖区' ) a ) 
WHERE
	NAME = '北京';

UPDATE region a 
SET Name = '1' 
WHERE
	a.pid IN ( SELECT id FROM region WHERE NAME = '市辖区' );

UPDATE region a 
SET Name = '1' 
WHERE
	a.pid IN ( SELECT b.id FROM (select * FROM region) b WHERE b.NAME = '市辖区' );

UPDATE region a 
SET pid = (
	SELECT
		b.pid 
	FROM
		( SELECT id, pid FROM region b WHERE b.NAME = '市辖区' ) b 
	WHERE
		a.Pid = b.id 
	) 
WHERE
	a.pid IN ( SELECT c.id FROM ( SELECT * FROM region ) c WHERE c.NAME = '市辖区' );

delete from tbl where id in 
(
    select max(id) from tbl a where EXISTS
    (
        select 1 from tbl b where a.tac=b.tac group by tac HAVING count(1)>1
    )
    group by tac
);

delete from tbl where id in 
(
    select a.id from 
    (
        select max(id) id from tbl a where EXISTS
        (
            select 1 from tbl b where a.tac=b.tac group by tac HAVING count(1)>1
        )
        group by tac
    ) a
);