日考1

.gitignore

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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

.idea/$PROJECT_FILE$

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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>

.idea/.gitignore

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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

.idea/encodings.xml

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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>

.idea/inspectionProfiles/Project_Default.xml

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+<component name="InspectionProjectProfileManager">
+  <profile version="1.0">
+    <option name="myName" value="Project Default" />
+  </profile>
+</component>

.idea/misc.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ExternalStorageConfigurationManager" enabled="true" />
+  <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" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+  <component name="SuppressionsComponent">
+    <option name="suppComments" value="[]" />
+  </component>
+</project>

.idea/qaplug_profiles.xml

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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>

pom.xml

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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>org.example</groupId>
+    <artifactId>rikao1</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>

sql/rikao1.sql

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+/*
+ Navicat Premium Data Transfer
+
+ Source Server         : 49.235.138.50
+ Source Server Type    : MySQL
+ Source Server Version : 80400
+ Source Host           : 49.235.138.50:3306
+ Source Schema         : rikao1
+
+ Target Server Type    : MySQL
+ Target Server Version : 80400
+ File Encoding         : 65001
+
+ Date: 18/07/2024 08:59:14
+*/
+
+SET NAMES utf8mb4;
+SET FOREIGN_KEY_CHECKS = 0;
+
+-- ----------------------------
+-- Table structure for t_stu
+-- ----------------------------
+DROP TABLE IF EXISTS `t_stu`;
+CREATE TABLE `t_stu`  (
+  `stu_id` int NOT NULL AUTO_INCREMENT,
+  `name` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL,
+  `sex` varchar(2) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL,
+  `tel` varchar(12) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL,
+  `class_id` int NULL DEFAULT NULL,
+  `age` int NULL DEFAULT NULL,
+  `sal` decimal(10, 2) NULL DEFAULT NULL,
+  PRIMARY KEY (`stu_id`) USING BTREE
+) ENGINE = InnoDB CHARACTER SET = utf8mb4 COLLATE = utf8mb4_0900_ai_ci ROW_FORMAT = Dynamic;
+
+-- ----------------------------
+-- Records of t_stu
+-- ----------------------------
+INSERT INTO `t_stu` VALUES (1, '张三', '男', '12345678901', 1, 18, 3000.00);
+INSERT INTO `t_stu` VALUES (2, '李四', '男', '12345678901', 20, 18, 3000.00);
+INSERT INTO `t_stu` VALUES (3, '王五', '男', '12345678901', 30, 19, 3000.00);
+INSERT INTO `t_stu` VALUES (4, '赵六', '男', '12345678901', 1, 18, 3000.00);
+INSERT INTO `t_stu` VALUES (5, '田七', '男', '12345678901', 20, 18, 6000.00);
+INSERT INTO `t_stu` VALUES (6, '翠兰', '女', '12345678901', 30, 20, 3000.00);
+INSERT INTO `t_stu` VALUES (7, '翠花', '女', '12345678901', 1, 17, 7000.00);
+
+SET FOREIGN_KEY_CHECKS = 1;
+
+
+    -- 2.查询所有学生信息，并根据年龄进行降序排序。（10分）
+SELECT * FROM t_stu ORDER BY age desc
+
+-- 3.显示姓王的学生的详细信息。（10分）
+SELECT * FROM t_stu WHERE SUBSTR(name,1,1)='王'
+
+-- 4.查询工资大于5000的所有男同学的信息。（10分）
+SELECT * FROM t_stu WHERE sal >5000
+
+-- 5.查询班级编号为20的男同学的电话号码。（10分）
+SELECT name,tel FROM t_stu WHERE class_id=20
+
+-- 6.查询最低工资。（10分）
+SELECT min(sal) FROM t_stu
+
+-- 7.查询班级为30的学生的最小年龄。（10分）
+SELECT min(age) FROM t_stu WHERE class_id=30
+
+-- 8.查询女生的最低工资。（15分）
+SELECT min(sal) FROM t_stu WHERE sex='女'
+
+-- 9.查询女学生中薪资最低的人的全部信息。（15分）
+SELECT * FROM t_stu WHERE sal = (SELECT min(sal) FROM t_stu) and sex='女'

src/main/java/org/example/Main.java

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+package org.example;
+
+/**
+ * @Author：zhangzhihao
+ * @name：${NAME}
+ * @Date：2024/7/18 20:37
+ * 不准抄代码，添加注释，清楚每一行代码意思
+ */
+public class Main {
+    public static void main(String[] args) {
+        System.out.println("Hello world!");
+    }
+}