mysql中新建表和理清表之间有什么联系
发布时间：2022-01-11 09:24:57 所属栏目：MySql教程 来源：互联网
导读：这篇文章给大家分享的是有关mysql中新建表和理清表之间有什么联系的内容。小编觉得挺实用的，因此分享给大家做个参考，一起跟随小编过来看看吧。 /* Navicat MySQL Data Transfer Source Server : localhost Source Server Version : 50520 Source Host :
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这篇文章给大家分享的是有关mysql中新建表和理清表之间有什么联系的内容。小编觉得挺实用的，因此分享给大家做个参考，一起跟随小编过来看看吧。 /* Navicat MySQL Data Transfer Source Server : localhost Source Server Version : 50520 Source Host : localhost:3306 Source Database : gupao Target Server Type : MYSQL Target Server Version : 50520 File Encoding : 65001 Date: 2018-07-24 22:42:54 */ SET FOREIGN_KEY_CHECKS=0; -- ---------------------------- -- Table structure for baoming -- ---------------------------- DROP TABLE IF EXISTS `baoming`; CREATE TABLE `baoming` ( `id` int(11) NOT NULL AUTO_INCREMENT, `sid` int(11) DEFAULT NULL, `kid` int(11) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=12 DEFAULT CHARSET=utf8; -- ---------------------------- -- Records of baoming -- ---------------------------- INSERT INTO `baoming` VALUES ('1', '1', '1'); INSERT INTO `baoming` VALUES ('2', '2', '1'); INSERT INTO `baoming` VALUES ('3', '3', '1'); INSERT INTO `baoming` VALUES ('4', '4', '2'); INSERT INTO `baoming` VALUES ('5', '5', '2'); INSERT INTO `baoming` VALUES ('6', '6', '2'); INSERT INTO `baoming` VALUES ('7', '7', '3'); INSERT INTO `baoming` VALUES ('9', '1', '3'); INSERT INTO `baoming` VALUES ('10', '3', '3'); INSERT INTO `baoming` VALUES ('11', '5', '3'); -- ---------------------------- -- Table structure for class -- ---------------------------- DROP TABLE IF EXISTS `class`; CREATE TABLE `class` ( `cid` int(11) NOT NULL AUTO_INCREMENT, `level` int(11) DEFAULT NULL, `name` varchar(255) DEFAULT NULL, PRIMARY KEY (`cid`) ) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8; -- ---------------------------- -- Records of class -- ---------------------------- INSERT INTO `class` VALUES ('1', '1', '班级1'); INSERT INTO `class` VALUES ('2', '1', '班级2'); INSERT INTO `class` VALUES ('3', '2', '班级3'); INSERT INTO `class` VALUES ('4', '3', '班级4'); -- ---------------------------- -- Table structure for ke -- ---------------------------- DROP TABLE IF EXISTS `ke`; CREATE TABLE `ke` ( `kid` int(11) NOT NULL AUTO_INCREMENT, `name` varchar(255) DEFAULT NULL, `tid` int(11) DEFAULT NULL, PRIMARY KEY (`kid`) ) ENGINE=InnoDB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8; -- ---------------------------- -- Records of ke -- ---------------------------- INSERT INTO `ke` VALUES ('1', '课程1', '2'); INSERT INTO `ke` VALUES ('2', '课程2', '1'); INSERT INTO `ke` VALUES ('3', '课程3', '5'); INSERT INTO `ke` VALUES ('4', '课程4', '5'); INSERT INTO `ke` VALUES ('5', '课程0', '0'); INSERT INTO `ke` VALUES ('6', '课程', null); -- ---------------------------- -- Table structure for student -- ---------------------------- DROP TABLE IF EXISTS `student`; CREATE TABLE `student` ( `sid` int(11) NOT NULL AUTO_INCREMENT, `name` varchar(255) DEFAULT NULL, `sex` int(11) DEFAULT '1', `cid` int(11) DEFAULT NULL, PRIMARY KEY (`sid`) ) ENGINE=InnoDB AUTO_INCREMENT=11 DEFAULT CHARSET=utf8; -- ---------------------------- -- Records of student -- ---------------------------- INSERT INTO `student` VALUES ('1', '学生1', '1', '1'); INSERT INTO `student` VALUES ('2', '学生2', '1', '1'); INSERT INTO `student` VALUES ('3', '学生3', '2', '1'); INSERT INTO `student` VALUES ('4', '学生4', '2', '1'); INSERT INTO `student` VALUES ('5', '学生5', '1', '2'); INSERT INTO `student` VALUES ('6', '学生6', '1', '2'); INSERT INTO `student` VALUES ('7', '学生7', '2', '2'); INSERT INTO `student` VALUES ('8', '学生8', '2', '2'); INSERT INTO `student` VALUES ('9', '学生9', '1', '3'); INSERT INTO `student` VALUES ('10', '学生0', '1', '0'); -- ---------------------------- -- Table structure for teacher -- ---------------------------- DROP TABLE IF EXISTS `teacher`; CREATE TABLE `teacher` ( `tid` int(11) NOT NULL AUTO_INCREMENT, `name` varchar(255) DEFAULT NULL, `sex` int(11) DEFAULT '1', PRIMARY KEY (`tid`) ) ENGINE=InnoDB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8; -- ---------------------------- -- Records of teacher -- ---------------------------- INSERT INTO `teacher` VALUES ('1', '教授1', '1'); INSERT INTO `teacher` VALUES ('2', '教授2', '1'); INSERT INTO `teacher` VALUES ('3', '教授3', '2'); INSERT INTO `teacher` VALUES ('4', '教授4', '2'); INSERT INTO `teacher` VALUES ('5', '大教授', '1'); INSERT INTO `teacher` VALUES ('6', '助教', '2'); 在上课的老师 SELECT DISTINCT t.name FROM ke JOIN teacher AS t ON ke.tid=t.tid 老师和学生的对应关系 SELECT * FROM ke JOIN teacher AS t ON ke.tid=t.tid JOIN baoming AS b ON ke.kid=b.kid JOIN student AS s ON b.sid=s.sid 感谢各位的阅读！关于“mysql中新建表和理清表之间有什么联系”这篇文章就分享到这里了，希望以上内容可以对大家有一定的帮助，让大家可以学到更多知识，如果觉得文章不错，可以把它分享出去让更多的人看到吧！ （编辑：源码门户网） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |
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