2022-12-19：大的国家。如果一个国家满足下述两个条件之一，则认为该国是 大国 ：面积至少为 300 万平方公里（即，30

DROP TABLE IF EXISTS `world`;
CREATE TABLE `world` (
  `name` varchar(255) NOT NULL,
  `continent` varchar(255) NOT NULL,
  `area` bigint(11) NOT NULL,
  `population` bigint(11) NOT NULL,
  `gdp` bigint(11) NOT NULL,
  PRIMARY KEY (`name`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

INSERT INTO `world` VALUES ('Afghanistan', 'Asia', '652230', '25500100', '20343000000');
INSERT INTO `world` VALUES ('Algeria', 'Africa', '2381741', '37100000', '188681000000');
INSERT INTO `world` VALUES ('Andorra', 'Europe', '468', '78115', '3712000000');
INSERT INTO `world` VALUES ('Angola', 'Africa', '1246700', '20609294', '100990000000');
INSERT INTO `world` VALUES ('lbania', 'Europe', '28748', '2831741', '12960000000');

SELECT
    name, population, area
FROM
    world
WHERE
    area >= 3000000

UNION

SELECT
    name, population, area
FROM
    world
WHERE
    population >= 25000000
;