日考2
commit
a62be743fb
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@ -0,0 +1,38 @@
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||||||
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target/
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||||||
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!.mvn/wrapper/maven-wrapper.jar
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||||||
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!**/src/main/**/target/
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!**/src/test/**/target/
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||||||
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||||||
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### IntelliJ IDEA ###
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||||||
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.idea/modules.xml
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||||||
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.idea/jarRepositories.xml
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.idea/compiler.xml
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.idea/libraries/
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*.iws
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||||||
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*.iml
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*.ipr
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||||||
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### Eclipse ###
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.apt_generated
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.classpath
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.factorypath
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.project
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.settings
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.springBeans
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.sts4-cache
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### NetBeans ###
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/nbproject/private/
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/nbbuild/
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/dist/
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/nbdist/
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/.nb-gradle/
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build/
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!**/src/main/**/build/
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!**/src/test/**/build/
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### VS Code ###
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.vscode/
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### Mac OS ###
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.DS_Store
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@ -0,0 +1,8 @@
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# Default ignored files
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/shelf/
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/workspace.xml
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# Editor-based HTTP Client requests
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/httpRequests/
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# Datasource local storage ignored files
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/dataSources/
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/dataSources.local.xml
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@ -0,0 +1,20 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<project version="4">
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<component name="CamelCaseConfig">
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<option name="cb1State" value="false" />
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<option name="cb2State" value="false" />
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<option name="cb3State" value="false" />
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<option name="cb7State" value="false" />
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<option name="model">
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<array>
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<option value="kebab-case" />
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<option value="SNAKE_CASE" />
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<option value="CamelCase" />
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<option value="snake_case" />
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<option value="camelCase" />
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<option value="space case" />
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<option value="Camel Case" />
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</array>
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</option>
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</component>
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</project>
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<?xml version="1.0" encoding="UTF-8"?>
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<project version="4">
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<component name="Encoding" defaultCharsetForPropertiesFiles="UTF-8">
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<file url="file://$PROJECT_DIR$/src/main/java" charset="UTF-8" />
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<file url="file://$PROJECT_DIR$/src/main/resources" charset="UTF-8" />
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<file url="PROJECT" charset="UTF-8" />
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</component>
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</project>
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<component name="InspectionProjectProfileManager">
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<profile version="1.0">
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<option name="myName" value="Project Default" />
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</profile>
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</component>
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<?xml version="1.0" encoding="UTF-8"?>
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<project version="4">
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<component name="ExternalStorageConfigurationManager" enabled="true" />
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<component name="MavenProjectsManager">
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<option name="originalFiles">
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<list>
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<option value="$PROJECT_DIR$/pom.xml" />
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</list>
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</option>
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</component>
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<component name="ProjectInspectionProfilesVisibleTreeState">
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<entry key="Project Default">
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<profile-state>
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<expanded-state>
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<State />
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<State>
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<id>Android</id>
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</State>
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|
<State>
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<id>CorrectnessLintAndroid</id>
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</State>
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|
<State>
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<id>Gradle</id>
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|
</State>
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<State>
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<id>Kotlin</id>
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</State>
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<State>
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<id>LintAndroid</id>
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</State>
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<State>
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<id>Maven</id>
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</State>
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|
<State>
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<id>MavenMigrationKotlin</id>
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</State>
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<State>
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<id>MigrationKotlin</id>
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</State>
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<State>
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<id>OSGi</id>
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</State>
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<State>
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<id>Probable bugsGradle</id>
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</State>
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</expanded-state>
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<selected-state>
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<State>
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<id>Android</id>
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</State>
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</selected-state>
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</profile-state>
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</entry>
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</component>
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<component name="ProjectRootManager" version="2" languageLevel="JDK_22" default="true" project-jdk-name="22" project-jdk-type="JavaSDK" />
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</project>
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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.muyu</groupId>
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<artifactId>rik02</artifactId>
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<version>1.0-SNAPSHOT</version>
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<properties>
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<maven.compiler.source>17</maven.compiler.source>
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<maven.compiler.target>17</maven.compiler.target>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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</properties>
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</project>
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@ -0,0 +1,71 @@
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-- 1.创建表
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-- 学生表，t_student，字段有：学生s_id，学生姓名s_name，性别sex（5分）
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CREATE TABLE `rik02`.`t_student` (
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`s_id` int NOT NULL AUTO_INCREMENT COMMENT '学生id',
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`s_name` varchar(100) NULL COMMENT '学生姓名',
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`sex` varchar(255) NULL COMMENT '性别',
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PRIMARY KEY (`s_id`)
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);
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-- 课程表，t_course，字段有：课程编号c_id，课程名称c_name。（5分）
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CREATE TABLE `rik02`.`t_course` (
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`c_id` int NOT NULL AUTO_INCREMENT COMMENT '课程编号',
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`c_name` varchar(100) NULL COMMENT '课程名称',
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PRIMARY KEY (`c_id`)
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);
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-- 选课表，stu_cou,字段：选课sc_id，课程编号c_id，学生s_id。（10分）
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CREATE TABLE `rik02`.`stu_cou` (
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`sc_id` int NOT NULL AUTO_INCREMENT COMMENT '学生id',
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`c_id` varchar(100) NULL COMMENT '课程编号',
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`s_id` varchar(255) NULL COMMENT '学生Id',
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PRIMARY KEY (`sc_id`)
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);
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-- 2.插入数据，要求：
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-- 学生人数不少于10人。（10分）
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INSERT INTO `rik02`.`t_student`
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(`s_name`, `sex`)
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VALUES
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( '学生1', '男'),
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( '学生2', '男'),
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( '学生3', '女'),
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( '学生4', '女'),
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( '学生5', '女'),
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( '学生6', '女'),
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( '学生7', '男'),
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( '学生8', '男'),
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( '学生9', '男'),
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( '学生10', '女');
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-- 课程数量不少于3。（5分）
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INSERT INTO `rik02`.`t_course`
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(`c_name`)
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VALUES
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( '课程1'),
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( '课程2'),
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( '课程3');
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-- 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）
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INSERT INTO `rik02`.`stu_cou`
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(`c_id`, `s_id`)
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VALUES
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( '1' , '2'),
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( '1' , '3'),
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( '1' , '4'),
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( '2' , '4'),
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( '3' , '4'),
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( '1' , '6'),
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( '2' , '6'),
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( '3' , '6'),
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( '1' , '7'),
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( '1' , '8'),
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( '1' , '9'),
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||||||
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( '2' , '7'),
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||||||
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( '2' , '9'),
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( '3' ,'10');
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||||||
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||||||
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-- 3.查询男生和女生各多少人。（15分）
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select sex,count(1) FROM t_student GROUP BY sex;
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-- 4. 查询男生和女生分别占总人数的比例。（20分）
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select sex,count(1)/(SELECT COUNT(1) FROM t_student) FROM t_student GROUP BY sex;
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-- 5.查询每门课程下的学生总人数。（15分）
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||||||
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SELECT c_name,COUNT(1) FROM `rik02`.t_course tc RIGHT JOIN `rik02`.stu_cou sc on tc.c_id = sc.c_id GROUP BY tc.c_id
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@ -0,0 +1,92 @@
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||||||
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/*
|
||||||
|
Navicat Premium Dump SQL
|
||||||
|
|
||||||
|
Source Server : localhost_3307
|
||||||
|
Source Server Type : MySQL
|
||||||
|
Source Server Version : 80031 (8.0.31)
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||||||
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Source Host : localhost:3307
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||||||
|
Source Schema : rik02
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||||||
|
|
||||||
|
Target Server Type : MySQL
|
||||||
|
Target Server Version : 80031 (8.0.31)
|
||||||
|
File Encoding : 65001
|
||||||
|
|
||||||
|
Date: 19/07/2024 09:04:06
|
||||||
|
*/
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||||||
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|
||||||
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SET NAMES utf8mb4;
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||||||
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SET FOREIGN_KEY_CHECKS = 0;
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||||||
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|
||||||
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-- ----------------------------
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||||||
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-- Table structure for stu_cou
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||||||
|
-- ----------------------------
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||||||
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DROP TABLE IF EXISTS `stu_cou`;
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||||||
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CREATE TABLE `stu_cou` (
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||||||
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`sc_id` int NOT NULL AUTO_INCREMENT COMMENT '学生id',
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||||||
|
`c_id` varchar(100) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL COMMENT '课程编号',
|
||||||
|
`s_id` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL COMMENT '学生Id',
|
||||||
|
PRIMARY KEY (`sc_id`) USING BTREE
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||||||
|
) ENGINE = InnoDB AUTO_INCREMENT = 15 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_0900_ai_ci ROW_FORMAT = Dynamic;
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||||||
|
|
||||||
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-- ----------------------------
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||||||
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-- Records of stu_cou
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||||||
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-- ----------------------------
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||||||
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INSERT INTO `stu_cou` VALUES (1, '1', '2');
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||||||
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INSERT INTO `stu_cou` VALUES (2, '1', '3');
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||||||
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INSERT INTO `stu_cou` VALUES (3, '1', '4');
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||||||
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INSERT INTO `stu_cou` VALUES (4, '2', '4');
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||||||
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INSERT INTO `stu_cou` VALUES (5, '3', '4');
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||||||
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INSERT INTO `stu_cou` VALUES (6, '1', '6');
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||||||
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INSERT INTO `stu_cou` VALUES (7, '2', '6');
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||||||
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INSERT INTO `stu_cou` VALUES (8, '3', '6');
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||||||
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INSERT INTO `stu_cou` VALUES (9, '1', '7');
|
||||||
|
INSERT INTO `stu_cou` VALUES (10, '1', '8');
|
||||||
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INSERT INTO `stu_cou` VALUES (11, '1', '9');
|
||||||
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INSERT INTO `stu_cou` VALUES (12, '2', '7');
|
||||||
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INSERT INTO `stu_cou` VALUES (13, '2', '9');
|
||||||
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INSERT INTO `stu_cou` VALUES (14, '3', '10');
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||||||
|
|
||||||
|
-- ----------------------------
|
||||||
|
-- Table structure for t_course
|
||||||
|
-- ----------------------------
|
||||||
|
DROP TABLE IF EXISTS `t_course`;
|
||||||
|
CREATE TABLE `t_course` (
|
||||||
|
`c_id` int NOT NULL AUTO_INCREMENT COMMENT '课程编号',
|
||||||
|
`c_name` varchar(100) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL COMMENT '课程名称',
|
||||||
|
PRIMARY KEY (`c_id`) USING BTREE
|
||||||
|
) ENGINE = InnoDB AUTO_INCREMENT = 4 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_0900_ai_ci ROW_FORMAT = Dynamic;
|
||||||
|
|
||||||
|
-- ----------------------------
|
||||||
|
-- Records of t_course
|
||||||
|
-- ----------------------------
|
||||||
|
INSERT INTO `t_course` VALUES (1, '课程1');
|
||||||
|
INSERT INTO `t_course` VALUES (2, '课程2');
|
||||||
|
INSERT INTO `t_course` VALUES (3, '课程3');
|
||||||
|
|
||||||
|
-- ----------------------------
|
||||||
|
-- Table structure for t_student
|
||||||
|
-- ----------------------------
|
||||||
|
DROP TABLE IF EXISTS `t_student`;
|
||||||
|
CREATE TABLE `t_student` (
|
||||||
|
`s_id` int NOT NULL AUTO_INCREMENT COMMENT '学生id',
|
||||||
|
`s_name` varchar(100) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL COMMENT '学生姓名',
|
||||||
|
`sex` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL COMMENT '性别',
|
||||||
|
PRIMARY KEY (`s_id`) USING BTREE
|
||||||
|
) ENGINE = InnoDB AUTO_INCREMENT = 12 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_0900_ai_ci ROW_FORMAT = Dynamic;
|
||||||
|
|
||||||
|
-- ----------------------------
|
||||||
|
-- Records of t_student
|
||||||
|
-- ----------------------------
|
||||||
|
INSERT INTO `t_student` VALUES (1, '1', '男');
|
||||||
|
INSERT INTO `t_student` VALUES (2, '学生1', '男');
|
||||||
|
INSERT INTO `t_student` VALUES (3, '学生2', '男');
|
||||||
|
INSERT INTO `t_student` VALUES (4, '学生3', '女');
|
||||||
|
INSERT INTO `t_student` VALUES (5, '学生4', '女');
|
||||||
|
INSERT INTO `t_student` VALUES (6, '学生5', '男');
|
||||||
|
INSERT INTO `t_student` VALUES (7, '学生6', '男');
|
||||||
|
INSERT INTO `t_student` VALUES (8, '学生7', '女');
|
||||||
|
INSERT INTO `t_student` VALUES (9, '学生8', '女');
|
||||||
|
INSERT INTO `t_student` VALUES (10, '学生9', '女');
|
||||||
|
INSERT INTO `t_student` VALUES (11, '学生10', '男');
|
||||||
|
|
||||||
|
SET FOREIGN_KEY_CHECKS = 1;
|
||||||
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Reference in New Issue