本文内容：
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视图
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触发器
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事务
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存储过程
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内置函数
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流程控制
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索引
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一、视图
视图就是通过查询得到一张虚拟表，然后保存下来，下次直接使用即可。
如果要频繁使用一张虚拟表，可以不用重复查询
视图使用方法：
-- 将表1与表2通过on后面的条件进行内连接，产生的新表 就是我们创建的视图表 create view 视图表名 as select * from 表1 inner join 表2 on 内连接条件
具体示例：
先建基础数据表及其记录（由于博客园暂找不到上传文件的地方，所以只能插入创建表的sql语句，将其复制粘贴到txt文档里面，最好是notpad++里面，然后存为sql文件，在Navicat里面导入就行了）
/* Navicat Premium Data Transfer Source Server : sgt'mysql Source Server Type : MySQL Source Server Version : 50726 Source Host : localhost:3306 Source Schema : day41 Target Server Type : MySQL Target Server Version : 50726 File Encoding : 65001 Date: 17/05/2019 14:54:11 */ SET NAMES utf8mb4; SET FOREIGN_KEY_CHECKS = 0; -- ---------------------------- -- Table structure for class -- ---------------------------- DROP TABLE IF EXISTS `class`; CREATE TABLE `class` ( `cid` int(11) NOT NULL AUTO_INCREMENT, `caption` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL, PRIMARY KEY (`cid`) USING BTREE ) ENGINE = InnoDB AUTO_INCREMENT = 5 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic; -- ---------------------------- -- Records of class -- ---------------------------- INSERT INTO `class` VALUES (1, '三年二班'); INSERT INTO `class` VALUES (2, '三年三班'); INSERT INTO `class` VALUES (3, '一年二班'); INSERT INTO `class` VALUES (4, '二年九班'); -- ---------------------------- -- Table structure for course -- ---------------------------- DROP TABLE IF EXISTS `course`; CREATE TABLE `course` ( `cid` int(11) NOT NULL AUTO_INCREMENT, `cname` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL, `teacher_id` int(11) NOT NULL, PRIMARY KEY (`cid`) USING BTREE, INDEX `fk_course_teacher`(`teacher_id`) USING BTREE, CONSTRAINT `fk_course_teacher` FOREIGN KEY (`teacher_id`) REFERENCES `teacher` (`tid`) ON DELETE RESTRICT ON UPDATE RESTRICT ) ENGINE = InnoDB AUTO_INCREMENT = 5 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic; -- ---------------------------- -- Records of course -- ---------------------------- INSERT INTO `course` VALUES (1, '生物', 1); INSERT INTO `course` VALUES (2, '物理', 2); INSERT INTO `course` VALUES (3, '体育', 3); INSERT INTO `course` VALUES (4, '美术', 2); -- ---------------------------- -- Table structure for score -- ---------------------------- DROP TABLE IF EXISTS `score`; CREATE TABLE `score` ( `sid` int(11) NOT NULL AUTO_INCREMENT, `student_id` int(11) NOT NULL, `course_id` int(11) NOT NULL, `num` int(11) NOT NULL, PRIMARY KEY (`sid`) USING BTREE, INDEX `fk_score_student`(`student_id`) USING BTREE, INDEX `fk_score_course`(`course_id`) USING BTREE, CONSTRAINT `fk_score_course` FOREIGN KEY (`course_id`) REFERENCES `course` (`cid`) ON DELETE RESTRICT ON UPDATE RESTRICT, CONSTRAINT `fk_score_student` FOREIGN KEY (`student_id`) REFERENCES `student` (`sid`) ON DELETE RESTRICT ON UPDATE RESTRICT ) ENGINE = InnoDB AUTO_INCREMENT = 53 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic; -- ---------------------------- -- Records of score -- ---------------------------- INSERT INTO `score` VALUES (1, 1, 1, 10); INSERT INTO `score` VALUES (2, 1, 2, 9); INSERT INTO `score` VALUES (5, 1, 4, 66); INSERT INTO `score` VALUES (6, 2, 1, 8); INSERT INTO `score` VALUES (8, 2, 3, 68); INSERT INTO `score` VALUES (9, 2, 4, 99); INSERT INTO `score` VALUES (10, 3, 1, 77); INSERT INTO `score` VALUES (11, 3, 2, 66); INSERT INTO `score` VALUES (12, 3, 3, 87); INSERT INTO `score` VALUES (13, 3, 4, 99); INSERT INTO `score` VALUES (14, 4, 1, 79); INSERT INTO `score` VALUES (15, 4, 2, 11); INSERT INTO `score` VALUES (16, 4, 3, 67); INSERT INTO `score` VALUES (17, 4, 4, 100); INSERT INTO `score` VALUES (18, 5, 1, 79); INSERT INTO `score` VALUES (19, 5, 2, 11); INSERT INTO `score` VALUES (20, 5, 3, 67); INSERT INTO `score` VALUES (21, 5, 4, 100); INSERT INTO `score` VALUES (22, 6, 1, 9); INSERT INTO `score` VALUES (23, 6, 2, 100); INSERT INTO `score` VALUES (24, 6, 3, 67); INSERT INTO `score` VALUES (25, 6, 4, 100); INSERT INTO `score` VALUES (26, 7, 1, 9); INSERT INTO `score` VALUES (27, 7, 2, 100); INSERT INTO `score` VALUES (28, 7, 3, 67); INSERT INTO `score` VALUES (29, 7, 4, 88); INSERT INTO `score` VALUES (30, 8, 1, 9); INSERT INTO `score` VALUES (31, 8, 2, 100); INSERT INTO `score` VALUES (32, 8, 3, 67); INSERT INTO `score` VALUES (33, 8, 4, 88); INSERT INTO `score` VALUES (34, 9, 1, 91); INSERT INTO `score` VALUES (35, 9, 2, 88); INSERT INTO `score` VALUES (36, 9, 3, 67); INSERT INTO `score` VALUES (37, 9, 4, 22); INSERT INTO `score` VALUES (38, 10, 1, 90); INSERT INTO `score` VALUES (39, 10, 2, 77); INSERT INTO `score` VALUES (40, 10, 3, 43); INSERT INTO `score` VALUES (41, 10, 4, 87); INSERT INTO `score` VALUES (42, 11, 1, 90); INSERT INTO `score` VALUES (43, 11, 2, 77); INSERT INTO `score` VALUES (44, 11, 3, 43); INSERT INTO `score` VALUES (45, 11, 4, 87); INSERT INTO `score` VALUES (46, 12, 1, 90); INSERT INTO `score` VALUES (47, 12, 2, 77); INSERT INTO `score` VALUES (48, 12, 3, 43); INSERT INTO `score` VALUES (49, 12, 4, 87); INSERT INTO `score` VALUES (52, 13, 3, 87); -- ---------------------------- -- Table structure for student -- ---------------------------- DROP TABLE IF EXISTS `student`; CREATE TABLE `student` ( `sid` int(11) NOT NULL AUTO_INCREMENT, `gender` char(1) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL, `class_id` int(11) NOT NULL, `sname` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL, PRIMARY KEY (`sid`) USING BTREE, INDEX `fk_class`(`class_id`) USING BTREE, CONSTRAINT `fk_class` FOREIGN KEY (`class_id`) REFERENCES `class` (`cid`) ON DELETE RESTRICT ON UPDATE RESTRICT ) ENGINE = InnoDB AUTO_INCREMENT = 17 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic; -- ---------------------------- -- Records of student -- ---------------------------- INSERT INTO `student` VALUES (1, '男', 1, '理解'); INSERT INTO `student` VALUES (2, '女', 1, '钢蛋'); INSERT INTO `student` VALUES (3, '男', 1, '张三'); INSERT INTO `student` VALUES (4, '男', 1, '张一'); INSERT INTO `student` VALUES (5, '女', 1, '张二'); INSERT INTO `student` VALUES (6, '男', 1, '张四'); INSERT INTO `student` VALUES (7, '女', 2, '铁锤'); INSERT INTO `student` VALUES (8, '男', 2, '李三'); INSERT INTO `student` VALUES (9, '男', 2, '李一'); INSERT INTO `student` VALUES (10, '女', 2, '李二'); INSERT INTO `student` VALUES (11, '男', 2, '李四'); INSERT INTO `student` VALUES (12, '女', 3, '如花'); INSERT INTO `student` VALUES (13, '男', 3, '刘三'); INSERT INTO `student` VALUES (14, '男', 3, '刘一'); INSERT INTO `student` VALUES (15, '女', 3, '刘二'); INSERT INTO `student` VALUES (16, '男', 3, '刘四'); -- ---------------------------- -- Table structure for teacher -- ---------------------------- DROP TABLE IF EXISTS `teacher`; CREATE TABLE `teacher` ( `tid` int(11) NOT NULL AUTO_INCREMENT, `tname` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL, PRIMARY KEY (`tid`) USING BTREE ) ENGINE = InnoDB AUTO_INCREMENT = 6 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic; -- ---------------------------- -- Records of teacher -- ---------------------------- INSERT INTO `teacher` VALUES (1, '张磊老师'); INSERT INTO `teacher` VALUES (2, '李平老师'); INSERT INTO `teacher` VALUES (3, '刘海燕老师'); INSERT INTO `teacher` VALUES (4, '朱云海老师'); INSERT INTO `teacher` VALUES (5, '李杰老师'); -- ---------------------------- -- View structure for teacher2course -- ---------------------------- DROP VIEW IF EXISTS `teacher2course`; CREATE ALGORITHM = UNDEFINED SQL SECURITY DEFINER VIEW `teacher2course` AS select `teacher`.`tid` AS `tid`,`teacher`.`tname` AS `tname`,`course`.`cid` AS `cid`,`course`.`cname` AS `cname`,`course`.`teacher_id` AS `teacher_id` from (`teacher` join `course` on((`teacher`.`tid` = `course`.`teacher_id`))); SET FOREIGN_KEY_CHECKS = 1;