MySQL中LAG()函数和LEAD()函数的使用

<窗口函数> OVER ([PARTITION BY <用于分组的列>] ORDER BY <用于排序的列>)

select id, date, temperature, LAG(temperature, 1, 0) OVER (order by date) as temp FROM weather

select id from (select id, date, temperature, LAG(temperature, 1, 0) OVER (order by date) as temp FROM weather) tmp where temperature>temp and temp != 0;

select id, date, temperature, LEAD(temperature, 1, 0) OVER (order by date) as temp FROM weather

select id from (select id, date, temperature, LEAD(temperature, 1, 0) OVER (order by date) as temp FROM weather) tmp where temperature>temp and temp != 0;

DROP TABLE IF EXISTS `weather`;
CREATE TABLE `weather`  (
  `id` int(11) NOT NULL,
  `date` date NULL DEFAULT NULL,
  `temperature` int(11) NULL DEFAULT NULL,
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;

-- ----------------------------
-- Records of weather
-- ----------------------------
INSERT INTO `weather` VALUES (1, '2022-08-01', 20);
INSERT INTO `weather` VALUES (2, '2022-08-02', 25);
INSERT INTO `weather` VALUES (3, '2022-08-03', 22);
INSERT INTO `weather` VALUES (4, '2022-08-04', 22);
INSERT INTO `weather` VALUES (5, '2022-08-05', 26);
INSERT INTO `weather` VALUES (6, '2022-08-06', 28);
INSERT INTO `weather` VALUES (7, '2022-08-07', 20);

SET FOREIGN_KEY_CHECKS = 1;