mysql实现横向转纵向与纵向转横向排列的方法？很多新手对此不是很清楚，为了帮助大家解决这个难题，下面小编将为大家详细讲解，有这方面需求的人可以来学习下，希望你能有所收获。
初始化数据
DROP TABLE IF EXISTS `test_01`;
CREATE TABLE `test_01` (
`id` int(0) NOT NULL,
`user` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL COMMENT '用户',
`km` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL COMMENT '科目',
`fs` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL COMMENT '分数',
`time` datetime(0) NULL DEFAULT NULL COMMENT '时间',
PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8mb4 COLLATE = utf8mb4_0900_ai_ci ROW_FORMAT = Dynamic;
INSERT INTO `test_01` VALUES (1, '小三', '语文', '98', '2020-08-06 15:51:21');
INSERT INTO `test_01` VALUES (2, '小三', '数学', '90', '2020-07-01 15:51:25');
INSERT INTO `test_01` VALUES (3, '小三', '英语', '77', '2020-06-01 15:51:28');
INSERT INTO `test_01` VALUES (4, '小二', '英语', '78', '2020-06-01 15:51:28');
一、横向转纵向排列
SELECT
user,
SUM( CASE WHEN km = "语文" THEN fs ELSE 0 END ) "语文",
SUM( CASE WHEN km = "数学" THEN fs ELSE 0 END ) "数学",
SUM( CASE WHEN km = "英语" THEN fs ELSE 0 END ) "英语"
FROM
test_01
GROUP BY user
二、纵向转横向排列
SELECT km FROM test_01 WHERE id = 1
UNION
SELECT fs FROM test_01 WHERE id = 1
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