日考 7.18
liuyibo
commit
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target/
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!.mvn/wrapper/maven-wrapper.jar
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!**/src/main/**/target/
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!**/src/test/**/target/
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### IntelliJ IDEA ###
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.idea/
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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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*.iml
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*.ipr
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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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<?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.bwie</groupId>
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<artifactId>day01</artifactId>
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<version>1.0-SNAPSHOT</version>
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<properties>
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<maven.compiler.source>8</maven.compiler.source>
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<maven.compiler.target>8</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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create table student(
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eid int(11) auto_increment primary key ,
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ename varchar(40),
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sex varchar(10),
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tel varchar(50),
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class_id int(11) ,
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age int(11),
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sal int(2)
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)
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insert into student(ename,sex,tel,class_id,age,sal) values
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('小红','女','16738192312','1','25','3000'),
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('小蓝','男','17863123412','2','10','1000'),
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('小绿','女','16234231124','2','25','2000'),
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('小黄','男','16867454532','1','25','8000')
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insert into student(ename,sex,tel,class_id,age,sal) values
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('小博','男','17639414630','1','50','10000')
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#2.查询所有学生信息，并根据年龄进行降序排序。（10分）
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SELECT
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*
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FROM
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student
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LEFT JOIN class ON class.class_id = student.class_id
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ORDER BY
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student.age DESC
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#3.显示姓王的学生的详细信息。（10分）
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SELECT
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*
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FROM
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student
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LEFT JOIN class ON class.class_id = student.class_id
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where student.ename like ('%王%')
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#4.查询工资大于5000的所有男同学的信息。（10分）
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SELECT
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*
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FROM
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student
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LEFT JOIN class ON class.class_id = student.class_id
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where student.sal > 5000
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#5.查询班级编号为20的男同学的电话号码。（10分）
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SELECT
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student.tel
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FROM
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student
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LEFT JOIN class ON class.class_id = student.class_id
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where student.class_id = 20
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and student.sex = '男'
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#6.查询最低工资。（10分）
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SELECT
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student.sal
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FROM
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student
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ORDER BY
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student.sal
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LIMIT 1
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#7.查询班级为30的学生的最小年龄。（10分）
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SELECT
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*
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FROM
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student
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LEFT JOIN class ON class.class_id = student.class_id
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where student.class_id = 20
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ORDER BY student.age limit 1
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#8.查询女生的最低工资。（15分）
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SELECT
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student.sal
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FROM
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student
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LEFT JOIN class ON class.class_id = student.class_id
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where student.sex = '女' ORDER BY student.sal limit 1
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#9.查询女学生中薪资最低的人的全部信息。（15分）
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SELECT
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*
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FROM
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student
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LEFT JOIN class ON class.class_id = student.class_id
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where student.sex = '女' ORDER BY student.sal limit 1
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@ -0,0 +1,66 @@
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/*
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Navicat Premium Data Transfer
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Source Server : 116.198.196.184
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Source Server Type : MySQL
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Source Server Version : 50736
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Source Host : 116.198.196.184:3306
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Source Schema : g6rk7_18
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Target Server Type : MySQL
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Target Server Version : 50736
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File Encoding : 65001
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Date: 18/07/2024 08:56:20
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*/
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SET NAMES utf8mb4;
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SET FOREIGN_KEY_CHECKS = 0;
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-- ----------------------------
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-- Table structure for class
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-- ----------------------------
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DROP TABLE IF EXISTS `class`;
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CREATE TABLE `class` (
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`class_id` int(11) NOT NULL AUTO_INCREMENT,
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`class_name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,
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PRIMARY KEY (`class_id`) USING BTREE
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) ENGINE = InnoDB AUTO_INCREMENT = 31 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = Dynamic;
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-- ----------------------------
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-- Records of class
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-- ----------------------------
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INSERT INTO `class` VALUES (1, '1班');
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INSERT INTO `class` VALUES (2, '2班');
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INSERT INTO `class` VALUES (20, '20班');
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INSERT INTO `class` VALUES (30, '30班');
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-- ----------------------------
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-- Table structure for student
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-- ----------------------------
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DROP TABLE IF EXISTS `student`;
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CREATE TABLE `student` (
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`eid` int(11) NOT NULL AUTO_INCREMENT,
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`ename` varchar(40) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,
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`sex` varchar(10) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,
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`tel` varchar(50) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,
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`class_id` int(11) NULL DEFAULT NULL,
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`age` int(11) NULL DEFAULT NULL,
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`sal` int(2) NULL DEFAULT NULL,
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PRIMARY KEY (`eid`) USING BTREE,
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INDEX `class_id`(`class_id`) USING BTREE,
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CONSTRAINT `student_ibfk_1` FOREIGN KEY (`class_id`) REFERENCES `class` (`class_id`) ON DELETE RESTRICT ON UPDATE RESTRICT
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) ENGINE = InnoDB AUTO_INCREMENT = 8 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = Dynamic;
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-- ----------------------------
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-- Records of student
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-- ----------------------------
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INSERT INTO `student` VALUES (1, '小红', '女', '16738192312', 1, 25, 3000);
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INSERT INTO `student` VALUES (2, '小蓝', '男', '1786312341230', 30, 10, 1000);
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INSERT INTO `student` VALUES (3, '小绿', '女', '16234231124', 30, 25, 2000);
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INSERT INTO `student` VALUES (4, '王黄', '男', '16867454532', 20, 25, 8000);
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INSERT INTO `student` VALUES (5, '小博', '男', '17639414630', 1, 50, 10000);
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INSERT INTO `student` VALUES (6, '小嘻嘻', '男', '12345678654', 20, 33, 3444);
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INSERT INTO `student` VALUES (7, '大嘻嘻', '女', '76543234561', 20, 33, 3333);
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SET FOREIGN_KEY_CHECKS = 1;
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Reference in New Issue