UPDATE `dbAAA`.`tbAAA` SET `C` = '1' WHERE `A` = 'ec';UPDATE `dbAAA`.`tbAAA` SET `C` = '1' WHERE `A` = 'dg';UPDATE `dbAAA`.`tbAAA` SET `C` = '1' WHERE `A` = 'yn';一次性操作UPDATE `dbAAA`.`tbAAA` SET `C` = '1' WHERE `A` IN ('ec','dg', 'yn');