commit 00b627bf08de66b37039bb04f3a49e86994cc280 Author: Yueng <14617246+YuengMeYuuer@user.noreply.gitee.com> Date: Fri Jul 19 09:57:05 2024 +0800 day_2 diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..5ff6309 --- /dev/null +++ b/.gitignore @@ -0,0 +1,38 @@ +target/ +!.mvn/wrapper/maven-wrapper.jar +!**/src/main/**/target/ +!**/src/test/**/target/ + +### IntelliJ IDEA ### +.idea/modules.xml +.idea/jarRepositories.xml +.idea/compiler.xml +.idea/libraries/ +*.iws +*.iml +*.ipr + +### Eclipse ### +.apt_generated +.classpath +.factorypath +.project +.settings +.springBeans +.sts4-cache + +### NetBeans ### +/nbproject/private/ +/nbbuild/ +/dist/ +/nbdist/ +/.nb-gradle/ +build/ +!**/src/main/**/build/ +!**/src/test/**/build/ + +### VS Code ### +.vscode/ + +### Mac OS ### +.DS_Store \ No newline at end of file diff --git a/.idea/$PROJECT_FILE$ b/.idea/$PROJECT_FILE$ new file mode 100644 index 0000000..58b7e3e --- /dev/null +++ b/.idea/$PROJECT_FILE$ @@ -0,0 +1,11 @@ + + + + + + + \ No newline at end of file diff --git a/.idea/.gitignore b/.idea/.gitignore new file mode 100644 index 0000000..13566b8 --- /dev/null +++ b/.idea/.gitignore @@ -0,0 +1,8 @@ +# Default ignored files +/shelf/ +/workspace.xml +# Editor-based HTTP Client requests +/httpRequests/ +# Datasource local storage ignored files +/dataSources/ +/dataSources.local.xml diff --git a/.idea/encodings.xml b/.idea/encodings.xml new file mode 100644 index 0000000..63574ec --- /dev/null +++ b/.idea/encodings.xml @@ -0,0 +1,8 @@ + + + + + + + + \ No newline at end of file diff --git a/.idea/inspectionProfiles/Project_Default.xml b/.idea/inspectionProfiles/Project_Default.xml new file mode 100644 index 0000000..8d66637 --- /dev/null +++ b/.idea/inspectionProfiles/Project_Default.xml @@ -0,0 +1,5 @@ + + + + \ No newline at end of file diff --git a/.idea/misc.xml b/.idea/misc.xml new file mode 100644 index 0000000..2b05e07 --- /dev/null +++ b/.idea/misc.xml @@ -0,0 +1,23 @@ + + + + { + "isMigrated": true +} + + + + + + + + + + + \ No newline at end of file diff --git a/.idea/qaplug_profiles.xml b/.idea/qaplug_profiles.xml new file mode 100644 index 0000000..9a7566c --- /dev/null +++ b/.idea/qaplug_profiles.xml @@ -0,0 +1,12 @@ + + + + + \ No newline at end of file diff --git a/pom.xml b/pom.xml new file mode 100644 index 0000000..e7c60d8 --- /dev/null +++ b/pom.xml @@ -0,0 +1,17 @@ + + + 4.0.0 + + com.bwie + day_2 + 1.0-SNAPSHOT + + + 8 + 8 + UTF-8 + + + diff --git a/sql/day_2.sql b/sql/day_2.sql new file mode 100644 index 0000000..322d083 --- /dev/null +++ b/sql/day_2.sql @@ -0,0 +1,90 @@ +/* + Navicat Premium Data Transfer + + Source Server : 110.41.47.6 + Source Server Type : MySQL + Source Server Version : 50734 + Source Host : 110.41.47.6:3306 + Source Schema : day_2 + + Target Server Type : MySQL + Target Server Version : 50734 + File Encoding : 65001 + + Date: 19/07/2024 09:08:24 +*/ + +SET NAMES utf8mb4; +SET FOREIGN_KEY_CHECKS = 0; + +-- ---------------------------- +-- Table structure for stu_cou +-- ---------------------------- +DROP TABLE IF EXISTS `stu_cou`; +CREATE TABLE `stu_cou` ( + `sc_id` int(11) NOT NULL AUTO_INCREMENT COMMENT '选课ID', + `c_id` int(11) NULL DEFAULT NULL COMMENT '课程编号', + `s_id` int(11) NULL DEFAULT NULL COMMENT '学生', + PRIMARY KEY (`sc_id`) USING BTREE +) ENGINE = InnoDB AUTO_INCREMENT = 13 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = Dynamic; + +-- ---------------------------- +-- Records of stu_cou +-- ---------------------------- +INSERT INTO `stu_cou` VALUES (1, 1, 1); +INSERT INTO `stu_cou` VALUES (2, 1, 2); +INSERT INTO `stu_cou` VALUES (3, 1, 3); +INSERT INTO `stu_cou` VALUES (4, 2, 2); +INSERT INTO `stu_cou` VALUES (5, 2, 5); +INSERT INTO `stu_cou` VALUES (6, 3, 8); +INSERT INTO `stu_cou` VALUES (7, 3, 7); +INSERT INTO `stu_cou` VALUES (8, 3, 6); +INSERT INTO `stu_cou` VALUES (9, 4, 2); +INSERT INTO `stu_cou` VALUES (10, 4, 1); +INSERT INTO `stu_cou` VALUES (11, 4, 9); +INSERT INTO `stu_cou` VALUES (12, 2, 4); + +-- ---------------------------- +-- Table structure for t_course +-- ---------------------------- +DROP TABLE IF EXISTS `t_course`; +CREATE TABLE `t_course` ( + `c_id` int(11) NOT NULL AUTO_INCREMENT COMMENT '课程编号', + `c_name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL COMMENT '课程名称', + PRIMARY KEY (`c_id`) USING BTREE +) ENGINE = InnoDB AUTO_INCREMENT = 5 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = Dynamic; + +-- ---------------------------- +-- Records of t_course +-- ---------------------------- +INSERT INTO `t_course` VALUES (1, '语文'); +INSERT INTO `t_course` VALUES (2, '数学'); +INSERT INTO `t_course` VALUES (3, '英语'); +INSERT INTO `t_course` VALUES (4, '政治'); + +-- ---------------------------- +-- Table structure for t_student +-- ---------------------------- +DROP TABLE IF EXISTS `t_student`; +CREATE TABLE `t_student` ( + `s_id` int(11) NOT NULL AUTO_INCREMENT COMMENT '学生ID', + `s_name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL COMMENT '学生姓名', + `s_sex` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL COMMENT '学生性别', + PRIMARY KEY (`s_id`) USING BTREE +) ENGINE = InnoDB AUTO_INCREMENT = 11 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = Dynamic; + +-- ---------------------------- +-- Records of t_student +-- ---------------------------- +INSERT INTO `t_student` VALUES (1, '张三', '男'); +INSERT INTO `t_student` VALUES (2, '李四', '男'); +INSERT INTO `t_student` VALUES (3, '张三', '女'); +INSERT INTO `t_student` VALUES (4, '李四', '男'); +INSERT INTO `t_student` VALUES (5, '张三', '男'); +INSERT INTO `t_student` VALUES (6, '李四', '男'); +INSERT INTO `t_student` VALUES (7, '张三', '男'); +INSERT INTO `t_student` VALUES (8, '李四', '男'); +INSERT INTO `t_student` VALUES (9, '王五', '女'); +INSERT INTO `t_student` VALUES (10, '赵六', '男'); + +SET FOREIGN_KEY_CHECKS = 1; diff --git a/sql/day_2.zip b/sql/day_2.zip new file mode 100644 index 0000000..359a17b Binary files /dev/null and b/sql/day_2.zip differ diff --git a/sql/text.sql b/sql/text.sql new file mode 100644 index 0000000..a32a222 --- /dev/null +++ b/sql/text.sql @@ -0,0 +1,61 @@ +CREATE DATABASES day_2 + +USE day_2 +-- 学生表 +CREATE TABLE t_student( + s_id INT（50） AUTO_INCREMENT COMMENT'学生ID', + s_name VALUES(255) COMMENT'学生姓名', + s_sex VALUES(255) COMMENT'性别' +) +-- 课程表 +CREATE TABLE t_course( + s_id INT（50） AUTO_INCREMENT COMMENT'课程编号', + c_name VALUES(255) COMMENT'课程名称' +) + +-- 选课表 +CREATE TABLE stu_cou( + sc_id INT（50） AUTO_INCREMENT COMMENT'选课ID', + c_id VALUES(255) COMMENT'课程编号', + s_id VALUES(255) COMMENT'学生' +) + +-- 学生人数不少于10人。（10分） +INSERT INTO t_student VALUES + (0, '张三', '男'), + (0, '李四', '男'), + (0, '张三', '女'), + (0, '李四', '男'), + (0, '张三', '男'), + (0, '李四', '男'), + (0, '张三', '男'), + (0, '李四', '男'); +-- 课程数量不少于3。（5分） +INSERT INTO t_course VALUES + (0, '语文'), + (0, '数学'), + (0, '英语'), + (0, '政治'); +-- 每个学生可以选择多个课程，每门课程至少有3个学生。（15分） +INSERT INTO stu_cou VALUES + (0, 1,1), + (0, 1,2), + (0, 1,3), + (0, 2,2), + (0, 2,5), + (0, 3,8), + (0, 3,7), + (0, 3,6), + (0, 4,2), + (0, 4,1), + (0, 4,9) + +-- 3.查询男生和女生各多少人。（15分） +SELECT COUNT(s_sex),t.* FROM t_student t GROUP BY s_sex + +-- 4. 查询男生和女生分别占总人数的比例。（20分） +SELECT AVG(t.s_id)/COUNT(s_sex) '总人数的比例',t.* FROM t_student t GROUP BY s_sex + +-- 5.查询每门课程下的学生总人数。（15分） +SELECT t.*,COUNT(s.c_id) '课程人数' FROM stu_cou s LEFT JOIN t_student t ON s.s_id = t.s_id GROUP BY s.c_id + diff --git a/效果展示/效果展示.doc b/效果展示/效果展示.doc new file mode 100644 index 0000000..f0696a5 Binary files /dev/null and b/效果展示/效果展示.doc differ