mysql横向转纵向、纵向转横向排列的方法

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 C

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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