日考1

.gitignore

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+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/
+.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/.gitignore

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+# 默认忽略的文件
+/shelf/
+/workspace.xml
+# 基于编辑器的 HTTP 客户端请求
+/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/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>
+    <option name="workspaceImportForciblyTurnedOn" value="true" />
+  </component>
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_17" default="true" project-jdk-name="1.8" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </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>demo1</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <properties>
+        <maven.compiler.source>17</maven.compiler.source>
+        <maven.compiler.target>17</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+</project>

sql/7-18考试SQL测试.sql

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+CREATE TABLE tb_student
+(
+	student_id INT(11) PRIMARY KEY auto_increment,
+	student_name VARCHAR(30),
+	student_sex VARCHAR(20),
+	student_phone VARCHAR(30),
+	student_clazz_id INT(11),
+	student_age INT(11),
+	student_salary DECIMAL(10,2)
+)
+
+DROP TABLE tb_student
+
+INSERT INTO tb_student(student_name,student_sex,student_phone,student_clazz_id,student_age,student_salary) 
+VALUES('王铭','男','12345679812',20,36,5200.00);
+
+INSERT INTO tb_student(student_name,student_sex,student_phone,student_clazz_id,student_age,student_salary) 
+VALUES('王虎','男','19423568794',30,26,1314.00);
+
+INSERT INTO tb_student(student_name,student_sex,student_phone,student_clazz_id,student_age,student_salary) 
+VALUES('小红','女','18754632389',30,18,3600.00);
+
+INSERT INTO tb_student(student_name,student_sex,student_phone,student_clazz_id,student_age,student_salary) 
+VALUES('曼萨','女','13649876354',52,20,7777.00);
+
+INSERT INTO tb_student(student_name,student_sex,student_phone,student_clazz_id,student_age,student_salary) 
+VALUES('钰萍','女','12345679812',77,22,9999.00);
+
+
+
+
+
+-- 查询所有学生信息，并根据年龄进行降序排序
+SELECT * FROM tb_student ORDER BY student_age DESC
+-- 显示姓王的学生的详细信息
+SELECT * FROM tb_student WHERE student_name LIKE '王%'
+-- 查询工资大于5000的所有男同学的信息
+SELECT * FROM tb_student WHERE student_salary > 5000 AND student_sex = '男'
+-- 查询班级编号为20的男同学的电话号码。
+SELECT student_phone FROM tb_student WHERE student_clazz_id = 20 AND student_sex = '男'
+-- 查询最低工资
+SELECT MIN(student_salary) AS min_salary FROM tb_student
+-- 查询班级为30的学生的最小年龄
+SELECT MIN(student_age) FROM tb_student WHERE student_clazz_id = 30
+-- 查询女生的最低工资
+SELECT MIN(student_salary) AS min_salary FROM tb_student WHERE student_sex = '女'
+-- 查询女学生中薪资最低的人的全部信息
+SELECT * FROM tb_student WHERE student_salary = (SELECT MIN(student_salary) FROM tb_student WHERE student_sex = '女')

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

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+package org.example;
+
+public class Main {
+    public static void main(String[] args) {
+        System.out.println("Hello world!");
+    }
+}