场景
业务需要，优惠券列表要求按类型进行排序，但是，类型并不是顺序的，即order by是解决不了问题的
建表
CREATE TABLE `custom_sort` (
`id` int(20) NOT NULL AUTO_INCREMENT,
`name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_german2_ci NOT NULL,
`type` tinyint(1) NOT NULL,
PRIMARY KEY (`id`) USING BTREE,
INDEX `so`(`type`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 8 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_german2_ci ROW_FORMAT = Dynamic;
插入数据
INSERT INTO `custom_sort` VALUES (1, \'刘一\', 1);
INSERT INTO `custom_sort` VALUES (2, \'陈二\', 2);
INSERT INTO `custom_sort` VALUES (3, \'张三\', 3);
INSERT INTO `custom_sort` VALUES (4, \'李四\', 2);
INSERT INTO `custom_sort` VALUES (5, \'王五\', 5);
INSERT INTO `custom_sort` VALUES (6, \'赵六\', 0);
INSERT INTO `custom_sort` VALUES (7, \'孙七\', 7);
表结构数据
解决方案
field函数
SELECT * FROM `custom_sort` ORDER BY FIELd(type,1,3) desc,type
case when then
SELECT * FROM `custom_sort` ORDER BY CASE WHEN type= 3 THEN 0 WHEN type= 1 THEN 1 else 2 END ,type asc
查询结果
