第24章 零基础学MySQL 章节练习题

其他 2021-11-26 08:15:45 阅读次数: 0

视频链接：韩顺平_循序渐进学Java零基础

建立 emp、salgrade、dept 表

-- MySQL dump 10.13  Distrib 5.7.36, for Win64 (x86_64)
--
-- Host: localhost    Database: temp
-- ------------------------------------------------------
-- Server version	5.7.36

/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8mb4 */;
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/*!40103 SET TIME_ZONE='+00:00' */;
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/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;
/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;

--
-- Table structure for table `emp`
--

DROP TABLE IF EXISTS `emp`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `emp` (
  `empno` mediumint(8) unsigned NOT NULL DEFAULT '0',
  `ename` varchar(20) NOT NULL DEFAULT '',
  `job` varchar(9) NOT NULL DEFAULT '',
  `mgr` mediumint(8) unsigned DEFAULT NULL,
  `hiredate` date NOT NULL,
  `sal` decimal(7,2) NOT NULL,
  `comm` decimal(7,2) DEFAULT NULL,
  `deptno` mediumint(8) unsigned NOT NULL DEFAULT '0'
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
/*!40101 SET character_set_client = @saved_cs_client */;

--
-- Dumping data for table `emp`
--

LOCK TABLES `emp` WRITE;
/*!40000 ALTER TABLE `emp` DISABLE KEYS */;
INSERT INTO `emp` VALUES (7369,'SMITH','CLERK',7902,'1990-12-17',800.00,NULL,20),(7499,'ALLEN','SALESMAN',7698,'1991-02-20',1600.00,300.00,30),(7521,'WARD','SALESMAN',7698,'1991-02-22',1250.00,500.00,30),(7566,'JONES','MANAGER',7839,'1991-04-02',2975.00,NULL,20),(7654,'MARTIN','SALESMAN',7698,'1991-09-28',1250.00,1400.00,30),(7698,'BLAKE','MANAGER',7839,'1991-05-01',2850.00,NULL,30),(7782,'CLARK','MANAGER',7839,'1991-06-09',2450.00,NULL,10),(7788,'SCOTT','ANALYST',7566,'1997-04-19',3000.00,NULL,20),(7839,'KING','PRESIDENT',NULL,'1991-11-17',5000.00,NULL,10),(7844,'TURNER','SALESMAN',7698,'1991-09-08',1500.00,NULL,30),(7900,'JAMES','CLERK',7698,'1991-12-03',950.00,NULL,30),(7902,'FORD','ANALYST',7566,'1991-12-03',3000.00,NULL,20),(7934,'MILLER','CLERK',7782,'1992-01-23',1300.00,NULL,10);
/*!40000 ALTER TABLE `emp` ENABLE KEYS */;
UNLOCK TABLES;

--
-- Table structure for table `salgrade`
--

DROP TABLE IF EXISTS `salgrade`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `salgrade` (
  `grade` mediumint(8) unsigned NOT NULL DEFAULT '0',
  `losal` decimal(17,2) NOT NULL,
  `hisal` decimal(17,2) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
/*!40101 SET character_set_client = @saved_cs_client */;

--
-- Dumping data for table `salgrade`
--

LOCK TABLES `salgrade` WRITE;
/*!40000 ALTER TABLE `salgrade` DISABLE KEYS */;
INSERT INTO `salgrade` VALUES (1,700.00,1200.00),(2,1201.00,1400.00),(3,1401.00,2000.00),(4,2001.00,3000.00),(5,3001.00,9999.00);
/*!40000 ALTER TABLE `salgrade` ENABLE KEYS */;
UNLOCK TABLES;

--
-- Table structure for table `dept`
--

DROP TABLE IF EXISTS `dept`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `dept` (
  `deptno` mediumint(8) unsigned NOT NULL DEFAULT '0',
  `dname` varchar(20) NOT NULL DEFAULT '',
  `loc` varchar(13) NOT NULL DEFAULT ''
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
/*!40101 SET character_set_client = @saved_cs_client */;

--
-- Dumping data for table `dept`
--

LOCK TABLES `dept` WRITE;
/*!40000 ALTER TABLE `dept` DISABLE KEYS */;
INSERT INTO `dept` VALUES (10,'ACCOUNTING','NEW YORK'),(20,'RESEARCH','DALLAS'),(30,'SALES','CHICAGO'),(40,'OPERATIONS','BOSTON');
/*!40000 ALTER TABLE `dept` ENABLE KEYS */;
UNLOCK TABLES;
/*!40103 SET TIME_ZONE=@OLD_TIME_ZONE */;

/*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
/*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;
/*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;
/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;
/*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;

-- Dump completed on 2021-11-07 19:12:42

章节作业2

-- 2.1 查看dept表和emp表的结构
DESC emp
DESC dept
-- 2.2 显示所有部门名称
SELECT dname FROM dept
-- 2.3 显示所有雇员名及其全年收入13月（工资+补助），并指定列别名“年收入”
SELECT ename,(sal+IF(comm IS NULL,0.0,comm))*13 AS '年收入' FROM emp
-- 2.4 显示工资超过2850的雇员姓名和工资
SELECT ename,sal FROM emp WHERE sal > 2850
-- 2.5 显示工资不在1500~2850之间的所有雇员名及工资
SELECT ename,sal FROM emp WHERE sal NOT BETWEEN 1500 AND 2850
-- 2.6 显示编号为7566的雇员姓名及所在部门编号
SELECT ename,dname FROM emp,dept WHERE empno = 7566 AND emp.deptno = dept.deptno 
-- 2.7 显示部门为10和30中员工工资超过1500的雇员名及工资
SELECT ename,sal FROM emp WHERE sal > 1500 AND deptno IN(10,30)
-- 2.8 显示无管理者的雇员名及工资
SELECT ename,job FROM emp WHERE mgr IS NULL
-- 2.9 显示在1991-2-1到1991-5-1之间雇用的雇员名，岗位及雇佣日期，并以雇佣日期进行排序
SELECT ename,job,hiredate FROM emp WHERE hiredate >= '1991-2-1' AND hiredate <= '1991-5-1' ORDER BY hiredate
-- 2.10 显示获得补助的所有雇员名、工资及补助，并以工资降序排序
SELECT ename,sal,comm FROM emp WHERE comm IS NOT NULL ORDER BY sal DESC

章节作业3

-- 3.1 选择部门30中的所有员工
SELECT ename FROM emp WHERE deptno = 30
-- 3.2 列出所有办事员(CLERK)的姓名、编号及部门编号
SELECT ename,empno,deptno FROM emp WHERE job='CLERK'
-- 3.3 找出雇佣金高于薪金的员工
SELECT * FROM emp WHERE IFNULL(comm,0.0)>sal
-- 3.4 找出佣金高于薪金60%的员工
SELECT * FROM emp WHERE IFNULL(comm,0.0) > sal*0.6
-- 3.5 找出部门10中所有的经理（MANAGER）和部门20中所有的办事员（CLERK）的详细资料
SELECT * FROM emp WHERE (deptno=10 AND job='MANAGER') OR (deptno=20 AND job='CLERK')
-- 3.6 找出部门10中所有经理，部门20中所有办事员，还有既不是经理也不是办事员但其佣金大于或等于2000的所有员工的详细资料
SELECT * FROM emp WHERE (deptno=30 AND job='MANAGER') OR (deptno=20 AND job='CLERK') OR (job NOT IN('MANAGER','CLERK') AND sal >= 2000)
-- 3.7 找出有奖金的员工的工作类型
SELECT DISTINCT job FROM emp WHERE comm IS NOT NULL
-- 3.8 找出没有奖金或奖金金额小于100的员工的雇员名
SELECT ename FROM emp WHERE comm IS NULL OR (comm IS NOT NULL AND comm < 100)
-- 3.9 找出各月倒数第3天受雇的员工
SELECT * FROM emp WHERE DATE_SUB(LAST_DAY(hiredate),INTERVAL 2 DAY)=hiredate
-- 3.10 找出早于12年前受雇的员工
SELECT * FROM emp WHERE hiredate < DATE_SUB(NOW(),INTERVAL 12 YEAR)
-- 3.11 以首字母小写的方式显示所有员工的姓名
SELECT CONCAT(LCASE(LEFT(ename,1)),SUBSTRING(ename,2)) FROM emp
-- 3.12 显示正好为5个字符的员工的姓名
SELECT ename FROM emp WHERE LENGTH(ename)=5

章节作业4

-- 4.1 显示不带'R'字母的员工的姓名
SELECT ename FROM emp WHERE INSTR(ename,'R')=0
-- 4.2 显示所有员工姓名的前三个字符
SELECT SUBSTRING(ename,1,3) FROM emp
-- 4.3 显示所有员工的姓名，用a替换所有的A
SELECT REPLACE(ename,'A','a') FROM emp
-- 4.4 显示满10年服务年限的员工的姓名和受雇日期
SELECT ename,hiredate FROM emp WHERE DATE_SUB(NOW(),INTERVAL 10 YEAR)>hiredate
-- 4.5 显示员工的详细资料，按姓名排序
SELECT * FROM emp ORDER BY ename
-- 4.6 显示员工的姓名和受雇日期，根据其服务年限，将最老的员工排在最前面
SELECT ename,hiredate FROM emp ORDER BY hiredate
-- 4.7 显示所有员工的姓名、工作和薪金，按工作降序排序，若工作相同则按薪金排序
SELECT ename,job,sal FROM emp ORDER BY job,sal
-- 4.8 显示所有员工的姓名，加入公司的年份和月份，按受雇日期所在月排序，若月份相同则将按年份升序排序
SELECT ename,YEAR(hiredate) AS `year`,MONTH(hiredate) AS `month` FROM emp ORDER BY `month`,`year`
-- 4.9 显示一个月为30天的员工的日薪金，单位为元
SELECT ename,FLOOR(sal/30) AS day_pay FROM emp WHERE DAY(LAST_DAY(hiredate))=30
-- 4.10 找出所有年份中2月受聘的员工
SELECT ename FROM emp WHERE MONTH(hiredate)=2
-- 4.11 显示每个员工加入公司的天数，按天数降序排列
SELECT ename,DATEDIFF(NOW(),hiredate) AS days FROM emp ORDER BY days DESC
-- 4.12 显示员工姓名中含有A的所有员工的姓名
SELECT ename FROM emp WHERE ename LIKE '%A%'
-- 4.13 以年月日的方式显示所有员工的服务年限
SELECT ename, FROM_DAYS(DATEDIFF(NOW(),hiredate)) AS service_time FROM emp

章节作业5

-- 5.1 列出至少有一个员工的部门
SELECT deptno,dname FROM dept WHERE deptno IN (SELECT DISTINCT deptno FROM emp)
-- 5.2 列出薪金比 "SMITH" 高的员工
SELECT ename,sal FROM emp WHERE sal > (SELECT sal FROM emp WHERE ename='SMITH')
-- 5.3 列出受雇日期晚于其直接上级的所有员工
SELECT emp1.ename AS 'employee',emp2.ename AS 'leader' FROM emp emp1,emp emp2 WHERE emp1.mgr=emp2.empno AND emp1.hiredate > emp2.hiredate
-- 5.4 列出部门名称和这些部门的员工信息，同时列出那些没有员工的部门
SELECT emp.*,dname FROM emp RIGHT JOIN dept ON dept.deptno=emp.deptno ORDER BY dname 
-- 5.5 列出所有办事员（CLERK）的姓名及其部门名称
SELECT ename,dname FROM emp,dept WHERE emp.job='CLERK' AND dept.deptno=emp.deptno
-- 5.6 列出最低薪金大于1500的各种工作
SELECT DISTINCT job FROM emp WHERE emp.sal > 1500
-- 5.7 列出在销售部门（SALES）工作的员工的姓名
SELECT ename FROM emp,dept WHERE emp.deptno=dept.deptno AND dname='SALES'
-- 5.8 列出薪金高于公司平均薪金的员工姓名
SELECT ename FROM emp WHERE sal > (SELECT AVG(sal) FROM emp)

章节作业6

-- 6.1 列出与 “SCOTT” 工作相同的所有员工
SELECT ename FROM emp WHERE job = (SELECT job FROM emp WHERE ename = 'SCOTT') AND ename != 'SCOTT'
-- 6.2 列出薪金高于30号部门最高工资的其它部门的员工姓名和薪金
SELECT ename,sal FROM emp WHERE sal > (SELECT MAX(sal) FROM emp WHERE deptno = 30) AND deptno != 30
-- 6.3 列出每个部门的员工数量，平均工资和员工平均服务天数
SELECT COUNT(empno) AS numbers_of_dept, AVG(sal) AS avg_sal ,AVG(DATEDIFF(NOW(),hiredate)) AS avg_days FROM emp GROUP BY deptno
-- 6.4 列出所有员工的姓名，部门名称及工资
SELECT ename,dname,sal FROM emp,dept WHERE emp.deptno = dept.deptno
-- 6.5 列出所有部门的详细信息和部门人数
SELECT dept.*,temp.cnt_emp FROM dept,(SELECT COUNT(empno) AS cnt_emp,deptno FROM emp GROUP BY deptno) AS temp WHERE dept.deptno = temp.deptno 
-- 6.6 列出各种工作的最低工资
SELECT MIN(sal) AS min_sal, job FROM emp GROUP BY job
-- 6.7 列出经理（MANAGER）的最低薪金
SELECT MIN(sal) AS min_sal_manager FROM emp WHERE job = 'MANAGER'
-- 6.8 列出所有员工的年薪，按年薪多少升序排列
SELECT ename, (sal*12 + IFNULL(comm,0)) AS year_sal FROM emp ORDER BY year_sal

章节作业7、8

  • 设学校环境如下：一个系有若干个专业，每个专业一年只招一个班，每个班有若干个学生。现要建立关于系、班级、学生的数据库，数据库名为stu_db。关系模式如下：
    dept(系)：deptid(系号)，deptname(系名)
    class(班)：classid(班号)，subject(专业),deptname(所在系),enrolltime(入学年份),num(人数)
    student(学生)：sudid(学号),stuname(姓名),stuage(年龄),classid(班级)
-- MySQL dump 10.13  Distrib 5.7.36, for Win64 (x86_64)
--
-- Host: localhost    Database: stu_db
-- ------------------------------------------------------
-- Server version	5.7.36

/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8mb4 */;
/*!40103 SET @OLD_TIME_ZONE=@@TIME_ZONE */;
/*!40103 SET TIME_ZONE='+00:00' */;
/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;
/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;
/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;

--
-- Current Database: `stu_db`
--

CREATE DATABASE /*!32312 IF NOT EXISTS*/ `stu_db` /*!40100 DEFAULT CHARACTER SET utf8mb4 */;

USE `stu_db`;

--
-- Table structure for table `class`
--

DROP TABLE IF EXISTS `class`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `class` (
  `classid` int(11) NOT NULL,
  `subject` varchar(32) DEFAULT NULL,
  `deptname` varchar(32) DEFAULT NULL,
  `enrolltime` year(4) DEFAULT NULL,
  `num` int(11) DEFAULT NULL,
  PRIMARY KEY (`classid`),
  KEY `deptname` (`deptname`),
  CONSTRAINT `class_ibfk_1` FOREIGN KEY (`deptname`) REFERENCES `dept` (`deptname`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
/*!40101 SET character_set_client = @saved_cs_client */;

--
-- Dumping data for table `class`
--

LOCK TABLES `class` WRITE;
/*!40000 ALTER TABLE `class` DISABLE KEYS */;
INSERT INTO `class` VALUES (101,'软件','计算机',1995,20),(102,'微电子','计算机',1996,30),(111,'无机化学','化学',1995,29),(112,'高分子化学','化学',1996,25),(121,'统计数学','数学',1995,20),(131,'现代语言','中文',1996,20),(141,'国际贸易','经济',1997,30),(142,'国际金融','经济',1996,14);
/*!40000 ALTER TABLE `class` ENABLE KEYS */;
UNLOCK TABLES;

--
-- Table structure for table `dept`
--

DROP TABLE IF EXISTS `dept`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `dept` (
  `deptid` int(11) NOT NULL,
  `deptname` varchar(32) DEFAULT NULL,
  PRIMARY KEY (`deptid`),
  UNIQUE KEY `deptname` (`deptname`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
/*!40101 SET character_set_client = @saved_cs_client */;

--
-- Dumping data for table `dept`
--

LOCK TABLES `dept` WRITE;
/*!40000 ALTER TABLE `dept` DISABLE KEYS */;
INSERT INTO `dept` VALUES (4,'中文'),(3,'化学'),(1,'数学'),(5,'经济'),(2,'计算机');
/*!40000 ALTER TABLE `dept` ENABLE KEYS */;
UNLOCK TABLES;

--
-- Table structure for table `student`
--

DROP TABLE IF EXISTS `student`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `student` (
  `stuid` int(11) NOT NULL,
  `stuname` varchar(32) NOT NULL,
  `stuage` smallint(6) DEFAULT NULL,
  `classid` int(11) DEFAULT NULL,
  PRIMARY KEY (`stuid`),
  KEY `classid` (`classid`),
  CONSTRAINT `student_ibfk_1` FOREIGN KEY (`classid`) REFERENCES `class` (`classid`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
/*!40101 SET character_set_client = @saved_cs_client */;

--
-- Dumping data for table `student`
--

LOCK TABLES `student` WRITE;
/*!40000 ALTER TABLE `student` DISABLE KEYS */;
INSERT INTO `student` VALUES (8101,'张三',18,101),(8102,'钱四',16,121),(8103,'王玲',17,131),(8105,'李飞',19,102),(8109,'赵四',18,141),(8110,'李可',20,142),(8201,'张飞',18,111),(8203,'王亮',17,111),(8302,'周瑜',16,112),(8305,'董庆',19,102),(8409,'赵龙',18,101),(8510,'李丽',20,142);
/*!40000 ALTER TABLE `student` ENABLE KEYS */;
UNLOCK TABLES;
/*!40103 SET TIME_ZONE=@OLD_TIME_ZONE */;

/*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
/*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;
/*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;
/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;
/*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;

-- Dump completed on 2021-11-08 15:49:09


-- 1. 找出所有姓李的学生
SELECT * FROM student WHERE stuname LIKE '李%'
-- 2. 列出专业数量大于1的系的名字
SELECT COUNT(deptname) AS sub_nums FROM class GROUP BY deptname HAVING sub_nums>1
-- 3. 列出人数大于等于30的系的编号和名称
SELECT dept.* FROM dept,class WHERE class.num >= 30 AND dept.deptname = class.deptname
-- 4. 学校又增加了一个物理系，编号为006
INSERT INTO dept VALUES (6,'物理系')
-- 5. 学生张三退学，请更新相关的表
START TRANSACTION
UPDATE class SET num = num-1 WHERE classid = (SELECT classid FROM student WHERE stuname = '张三');
DELETE FROM student WHERE stuname = '张三';
COMMIT;

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