数据库|mysql教程
mysql
查询
无限极分类
排序
数据库-mysql教程
mysql查询无限极分类排序
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表是这样设计的
2，4,5字段请无视
现在要查询出来这样格式的数据
一级分类
二级分类A
三级分类A
三级分类B
二级分类B
三级分类A
三级分类B
我使用的sql为 select * from vn_erp_healthprice order by sorts
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sorts字段为varchar类型
查询的结果如下
排序结果满足业务要求,但为什么1-11排在1-2前面
还有 根据字符串排序这是个什么原理来着 好久没用过这种分类了 一时想不起来了
求大神赐教
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表sql如下
/*Navicat MySQL Data TransferSource Server : localhostSource Server Version : 50621Source Host : 127.0.0.1:3306Source Database : testTarget Server Type : MYSQLTarget Server Version : 50621File Encoding : 65001Date: -07-15 16:38:49*/SET FOREIGN_KEY_CHECKS=0;-- ------------------------------ Table structure for `vn_erp_healthprice`-- ----------------------------DROP TABLE IF EXISTS `vn_erp_healthprice`;CREATE TABLE `vn_erp_healthprice` ( `id` int(10) NOT NULL AUTO_INCREMENT COMMENT 主键, `lyid` varchar(10) NOT NULL DEFAULT \ COMMENT 维修项id, `name` varchar(100) NOT NULL DEFAULT \ COMMENT 维修项名称, `price` varchar(10) NOT NULL DEFAULT \ COMMENT 工时单价, `hours` varchar(10) NOT NULL DEFAULT \ COMMENT 工时, `parent_id` int(11) NOT NULL DEFAULT , `sorts` varchar(20) NOT NULL DEFAULT \ COMMENT 排序, PRIMARY KEY (`id`), KEY `hid` (`lyid`)) ENGINE=InnoDB AUTO_INCREMENT=27 DEFAULT CHARSET=utf8;-- ------------------------------ Records of vn_erp_healthprice-- ----------------------------INSERT INTO `vn_erp_healthprice` VALUES (1, \, 保养(一级分类), \, \, , 1);INSERT INTO `vn_erp_healthprice` VALUES (2, \, 更换(二级分类), \, \, 1, 1-2);INSERT INTO `vn_erp_healthprice` VALUES (3, 1, 更换机油, \, \, 2, 1-2-3);INSERT INTO `vn_erp_healthprice` VALUES (4, 2, 更换机油滤清器, \, \, 2, 1-2-4);INSERT INTO `vn_erp_healthprice` VALUES (5, 3, 更换空气滤清器, \, \, 2, 1-2-5);INSERT INTO `vn_erp_healthprice` VALUES (6, 4, 更换燃油滤清器, \, \, 2, 1-2-6);INSERT INTO `vn_erp_healthprice` VALUES (7, 5, 更换全部火花塞, \, \, 2, 1-2-7);INSERT INTO `vn_erp_healthprice` VALUES (8, 6, 检查助力转向油, \, \, 11, 1-2-8);INSERT INTO `vn_erp_healthprice` VALUES (9, 7, 更换整车制动液, \, \, 2, 1-2-9);INSERT INTO `vn_erp_healthprice` VALUES (10, 8, 检查自动变速箱油, \, \, 11, 1-11-10);INSERT INTO `vn_erp_healthprice` VALUES (11, \, 检查(二级分类), \, \, 1, 1-11);INSERT INTO `vn_erp_healthprice` VALUES (12, 9, 检查或者更换手动变速箱油, \, \, 11, 1-11-12);INSERT INTO `vn_erp_healthprice` VALUES (13, 10, 检查发动机正时皮带, \, \, 11, 1-11-13);INSERT INTO `vn_erp_healthprice` VALUES (14, 11, 更换空调滤清器, \, \, 2, 1-2-14);INSERT INTO `vn_erp_healthprice` VALUES (15, \, 定期(二级分类), \, \, 1, 1-15);INSERT INTO `vn_erp_healthprice` VALUES (16, 12, 定期添加冷媒, \, \, 15, 1-15-16);INSERT INTO `vn_erp_healthprice` VALUES (17, 13, 检查空调管路, \, \, 11, 1-11-17);INSERT INTO `vn_erp_healthprice` VALUES (18, 14, 更换防冻冷却液, \, \, 2, 1-2-18);INSERT INTO `vn_erp_healthprice` VALUES (19, 15, 检查厚度、调整，必要时更换前刹车片, \, \, 11, 1-11-19);INSERT INTO `vn_erp_healthprice` VALUES (20, 16, 检查厚度、调整，必要时更换前刹车盘, \, \, 11, 1-11-20);INSERT INTO `vn_erp_healthprice` VALUES (21, 17, 检查厚度、调整，必要时更换后刹车片（蹄）, \, \, 11, 1-11-21);INSERT INTO `vn_erp_healthprice` VALUES (22, 18, 检查厚度、调整，必要时更换后刹车盘（鼓）, \, \, 11, 1-11-21);INSERT INTO `vn_erp_healthprice` VALUES (23, \, 调整(二级分类), \, \, 1, 1-22);INSERT INTO `vn_erp_healthprice` VALUES (24, 19, 调整雨刮（雨刷）, \, \, 23, 1-22-23);INSERT INTO `vn_erp_healthprice` VALUES (25, 20, 检查电瓶, \, \, 11, 1-11-24);INSERT INTO `vn_erp_healthprice` VALUES (26, 21, 检查减震器, \, \, 11, 1-11-25);
