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Cho 2 bảng thế này: CREATE TABLE `facebook` ( `name` varchar(45) NOT NULL, `city` varchar(45) DEFAULT NULL, PRIMARY KEY (`name`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci; CREATE TABLE `linkedin` ( `name` varchar(45) NOT NULL, `city` varchar(45) DEFAULT ...
