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day_2

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Yueng 2024-07-19 09:57:05 +08:00
commit 00b627bf08
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38
.gitignore vendored 100644
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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

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<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="AnalysisProjectProfileManager">
<option name="PROJECT_PROFILE" />
<option name="USE_PROJECT_LEVEL_SETTINGS" value="false" />
<list size="0" />
</component>
<component name="SuppressionsComponent">
<option name="suppComments" value="[]" />
</component>
</project>

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# Default ignored files
/shelf/
/workspace.xml
# Editor-based HTTP Client requests
/httpRequests/
# Datasource local storage ignored files
/dataSources/
/dataSources.local.xml

8
.idea/encodings.xml 100644
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<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="Encoding" defaultCharsetForPropertiesFiles="UTF-8">
<file url="file://$PROJECT_DIR$/src/main/java" charset="UTF-8" />
<file url="file://$PROJECT_DIR$/src/main/resources" charset="UTF-8" />
<file url="PROJECT" charset="UTF-8" />
</component>
</project>

5
.idea/inspectionProfiles/Project_Default.xml 100644
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<component name="InspectionProjectProfileManager">
<profile version="1.0">
<option name="myName" value="Project Default" />
</profile>
</component>

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.idea/misc.xml 100644
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<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="ExternalStorageConfigurationManager" enabled="true" />
<component name="KubernetesApiProvider">{
&quot;isMigrated&quot;: true
}</component>
<component name="MarkdownSettingsMigration">
<option name="stateVersion" value="1" />
</component>
<component name="MavenProjectsManager">
<option name="originalFiles">
<list>
<option value="$PROJECT_DIR$/pom.xml" />
</list>
</option>
</component>
<component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="true" project-jdk-name="1.8 (2)" project-jdk-type="JavaSDK">
<output url="file://$PROJECT_DIR$/out" />
</component>
<component name="SuppressionsComponent">
<option name="suppComments" value="[]" />
</component>
</project>

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.idea/qaplug_profiles.xml 100644
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<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="AnalysisProjectProfileManager">
<option name="PROJECT_PROFILE" value="Project Default" />
<option name="USE_PROJECT_LEVEL_SETTINGS" value="false" />
<scopes />
<profiles>
<profile profile_name="Project Default" version="1.0" is_locked="false" />
</profiles>
<list size="0" />
</component>
</project>

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pom.xml 100644
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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.bwie</groupId>
<artifactId>day_2</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<maven.compiler.source>8</maven.compiler.source>
<maven.compiler.target>8</maven.compiler.target>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
</project>

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sql/day_2.sql 100644
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/*
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;

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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

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