595.大的国家
创建表用到的sql语句
-- ----------------------------
-- Table structure for `world`
-- ----------------------------
DROP TABLE IF EXISTS `world`;
CREATE TABLE `world` (
`name`varchar(255) DEFAULT NULL,
`continent` varchar(255) DEFAULT NULL,
`area`int(11) DEFAULT NULL,
`population` int(11) DEFAULT NULL,
`gdp`varchar(20) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
-- ----------------------------
-- Records of world
-- ----------------------------
INSERT INTO `world` VALUES ('Afghanistan','Asia', '652230', '25500100', '20343000000');
INSERT INTO `world` VALUES ('Albania','Europe', '28748', '2831741', '12960000000');
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');
解析
通过select筛选name /population /area,用where查询
SELECT 列名称 FROM 表名称 WHERE 条件
select name,area, population from World
where area > 3000000 || population >25000000