7.27 mysql练习

作者: Summer2077 | 来源:发表于2020-07-27 15:10 被阅读0次

mysql练习题目:

#
# Structure for table "category"
#

DROP TABLE IF EXISTS `category`;
CREATE TABLE `category` (
  `categoryid` int(10) unsigned NOT NULL AUTO_INCREMENT COMMENT '主题id',
  `pid` int(10) NOT NULL COMMENT '父id',
  `categoryName` varchar(50) NOT NULL COMMENT '主题名字',
  PRIMARY KEY (`categoryid`)
) ENGINE=InnoDB AUTO_INCREMENT=9 DEFAULT CHARSET=utf8;

#
# Data for table "category"
#

INSERT INTO `category` VALUES (2,1,'信息技术'),(3,1,'软件开发'),(4,3,'数据库'),(5,1,'美术设计'),(6,3,'web开发'),(7,5,'ps技术'),(8,2,'办公信息');

#
# Structure for table "grade"
#

DROP TABLE IF EXISTS `grade`;
CREATE TABLE `grade` (
  `GradeID` int(11) NOT NULL AUTO_INCREMENT COMMENT '年级编号',
  `GradeName` varchar(50) NOT NULL COMMENT '年级名称',
  PRIMARY KEY (`GradeID`)
) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=utf8;

#
# Data for table "grade"
#

INSERT INTO `grade` VALUES (1,'大一'),(2,'大二'),(3,'大三'),(4,'大四'),(5,'预科班');

#
# Structure for table "result"
#

DROP TABLE IF EXISTS `result`;
CREATE TABLE `result` (
  `StudentNo` int(4) NOT NULL COMMENT '学号',
  `SubjectNo` int(4) NOT NULL COMMENT '课程编号',
  `ExamDate` datetime NOT NULL COMMENT '考试日期',
  `StudentResult` int(4) NOT NULL COMMENT '考试成绩',
  KEY `SubjectNo` (`SubjectNo`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

#
# Data for table "result"
#

INSERT INTO `result` VALUES (1000,1,'2013-11-11 16:00:00',94),(1000,2,'2012-11-10 10:00:00',75),(1000,3,'2011-12-19 10:00:00',76),(1000,4,'2010-11-18 11:00:00',93),(1000,5,'2013-11-11 14:00:00',97),(1000,6,'2012-09-13 15:00:00',87),(1000,7,'2011-10-16 16:00:00',79),(1000,8,'2010-11-11 16:00:00',74),(1000,9,'2013-11-21 10:00:00',69),(1000,10,'2012-11-11 12:00:00',78),(1000,11,'2011-11-11 14:00:00',66),(1000,12,'2010-11-11 15:00:00',82),(1000,13,'2013-11-11 14:00:00',94),(1000,14,'2012-11-11 15:00:00',98),(1000,15,'2011-12-11 10:00:00',70),(1000,16,'2010-09-11 10:00:00',74),(1001,1,'2013-11-11 16:00:00',76),(1001,2,'2012-11-10 10:00:00',93),(1001,3,'2011-12-19 10:00:00',65),(1001,4,'2010-11-18 11:00:00',71),(1001,5,'2013-11-11 14:00:00',98),(1001,6,'2012-09-13 15:00:00',74),(1001,7,'2011-10-16 16:00:00',85),(1001,8,'2010-11-11 16:00:00',69),(1001,9,'2013-11-21 10:00:00',63),(1001,10,'2012-11-11 12:00:00',70),(1001,11,'2011-11-11 14:00:00',62),(1001,12,'2010-11-11 15:00:00',90),(1001,13,'2013-11-11 14:00:00',97),(1001,14,'2012-11-11 15:00:00',89),(1001,15,'2011-12-11 10:00:00',72),(1001,16,'2010-09-11 10:00:00',90),(1002,1,'2013-11-11 16:00:00',61),(1002,2,'2012-11-10 10:00:00',80),(1002,3,'2011-12-19 10:00:00',89),(1002,4,'2010-11-18 11:00:00',88),(1002,5,'2013-11-11 14:00:00',82),(1002,6,'2012-09-13 15:00:00',91),(1002,7,'2011-10-16 16:00:00',63),(1002,8,'2010-11-11 16:00:00',84),(1002,9,'2013-11-21 10:00:00',60),(1002,10,'2012-11-11 12:00:00',71),(1002,11,'2011-11-11 14:00:00',93),(1002,12,'2010-11-11 15:00:00',96),(1002,13,'2013-11-11 14:00:00',83),(1002,14,'2012-11-11 15:00:00',69),(1002,15,'2011-12-11 10:00:00',89),(1002,16,'2010-09-11 10:00:00',83),(1003,1,'2013-11-11 16:00:00',91),(1003,2,'2012-11-10 10:00:00',75),(1003,3,'2011-12-19 10:00:00',65),(1003,4,'2010-11-18 11:00:00',63),(1003,5,'2013-11-11 14:00:00',90),(1003,6,'2012-09-13 15:00:00',96),(1003,7,'2011-10-16 16:00:00',97),(1003,8,'2010-11-11 16:00:00',77),(1003,9,'2013-11-21 10:00:00',62),(1003,10,'2012-11-11 12:00:00',81),(1003,11,'2011-11-11 14:00:00',76),(1003,12,'2010-11-11 15:00:00',61),(1003,13,'2013-11-11 14:00:00',93),(1003,14,'2012-11-11 15:00:00',79),(1003,15,'2011-12-11 10:00:00',78),(1003,16,'2010-09-11 10:00:00',96),(1004,1,'2013-11-11 16:00:00',84),(1004,2,'2012-11-10 10:00:00',79),(1004,3,'2011-12-19 10:00:00',76),(1004,4,'2010-11-18 11:00:00',78),(1004,5,'2013-11-11 14:00:00',81),(1004,6,'2012-09-13 15:00:00',90),(1004,7,'2011-10-16 16:00:00',63),(1004,8,'2010-11-11 16:00:00',89),(1004,9,'2013-11-21 10:00:00',67),(1004,10,'2012-11-11 12:00:00',100),(1004,11,'2011-11-11 14:00:00',94),(1004,12,'2010-11-11 15:00:00',65),(1004,13,'2013-11-11 14:00:00',86),(1004,14,'2012-11-11 15:00:00',77),(1004,15,'2011-12-11 10:00:00',82),(1004,16,'2010-09-11 10:00:00',87),(1005,1,'2013-11-11 16:00:00',82),(1005,2,'2012-11-10 10:00:00',92),(1005,3,'2011-12-19 10:00:00',80),(1005,4,'2010-11-18 11:00:00',92),(1005,5,'2013-11-11 14:00:00',97),(1005,6,'2012-09-13 15:00:00',72),(1005,7,'2011-10-16 16:00:00',84),(1005,8,'2010-11-11 16:00:00',79),(1005,9,'2013-11-21 10:00:00',76),(1005,10,'2012-11-11 12:00:00',87),(1005,11,'2011-11-11 14:00:00',65),(1005,12,'2010-11-11 15:00:00',67),(1005,13,'2013-11-11 14:00:00',63),(1005,14,'2012-11-11 15:00:00',64),(1005,15,'2011-12-11 10:00:00',99),(1005,16,'2010-09-11 10:00:00',97),(1006,1,'2013-11-11 16:00:00',82),(1006,2,'2012-11-10 10:00:00',73),(1006,3,'2011-12-19 10:00:00',79),(1006,4,'2010-11-18 11:00:00',63),(1006,5,'2013-11-11 14:00:00',97),(1006,6,'2012-09-13 15:00:00',83),(1006,7,'2011-10-16 16:00:00',78),(1006,8,'2010-11-11 16:00:00',88),(1006,9,'2013-11-21 10:00:00',89),(1006,10,'2012-11-11 12:00:00',82),(1006,11,'2011-11-11 14:00:00',70),(1006,12,'2010-11-11 15:00:00',69),(1006,13,'2013-11-11 14:00:00',64),(1006,14,'2012-11-11 15:00:00',80),(1006,15,'2011-12-11 10:00:00',90),(1006,16,'2010-09-11 10:00:00',85),(1007,1,'2013-11-11 16:00:00',87),(1007,2,'2012-11-10 10:00:00',63),(1007,3,'2011-12-19 10:00:00',70),(1007,4,'2010-11-18 11:00:00',74),(1007,5,'2013-11-11 14:00:00',79),(1007,6,'2012-09-13 15:00:00',83),(1007,7,'2011-10-16 16:00:00',86),(1007,8,'2010-11-11 16:00:00',76),(1007,9,'2013-11-21 10:00:00',65),(1007,10,'2012-11-11 12:00:00',87),(1007,11,'2011-11-11 14:00:00',69),(1007,12,'2010-11-11 15:00:00',69),(1007,13,'2013-11-11 14:00:00',90),(1007,14,'2012-11-11 15:00:00',84),(1007,15,'2011-12-11 10:00:00',95),(1007,16,'2010-09-11 10:00:00',92),(1008,1,'2013-11-11 16:00:00',96),(1008,2,'2012-11-10 10:00:00',62),(1008,3,'2011-12-19 10:00:00',97),(1008,4,'2010-11-18 11:00:00',84),(1008,5,'2013-11-11 14:00:00',86),(1008,6,'2012-09-13 15:00:00',72),(1008,7,'2011-10-16 16:00:00',67),(1008,8,'2010-11-11 16:00:00',83),(1008,9,'2013-11-21 10:00:00',86),(1008,10,'2012-11-11 12:00:00',60),(1008,11,'2011-11-11 14:00:00',61),(1008,12,'2010-11-11 15:00:00',68),(1008,13,'2013-11-11 14:00:00',99),(1008,14,'2012-11-11 15:00:00',77),(1008,15,'2011-12-11 10:00:00',73),(1008,16,'2010-09-11 10:00:00',78),(1009,1,'2013-11-11 16:00:00',67),(1009,2,'2012-11-10 10:00:00',70),(1009,3,'2011-12-19 10:00:00',75),(1009,4,'2010-11-18 11:00:00',92),(1009,5,'2013-11-11 14:00:00',76),(1009,6,'2012-09-13 15:00:00',90),(1009,7,'2011-10-16 16:00:00',62),(1009,8,'2010-11-11 16:00:00',68),(1009,9,'2013-11-21 10:00:00',70),(1009,10,'2012-11-11 12:00:00',83),(1009,11,'2011-11-11 14:00:00',88),(1009,12,'2010-11-11 15:00:00',65),(1009,13,'2013-11-11 14:00:00',91),(1009,14,'2012-11-11 15:00:00',99),(1009,15,'2011-12-11 10:00:00',65),(1009,16,'2010-09-11 10:00:00',83),(1010,1,'2013-11-11 16:00:00',83),(1010,2,'2012-11-10 10:00:00',87),(1010,3,'2011-12-19 10:00:00',89),(1010,4,'2010-11-18 11:00:00',99),(1010,5,'2013-11-11 14:00:00',91),(1010,6,'2012-09-13 15:00:00',96),(1010,7,'2011-10-16 16:00:00',72),(1010,8,'2010-11-11 16:00:00',72),(1010,9,'2013-11-21 10:00:00',98),(1010,10,'2012-11-11 12:00:00',73),(1010,11,'2011-11-11 14:00:00',68),(1010,12,'2010-11-11 15:00:00',62),(1010,13,'2013-11-11 14:00:00',67),(1010,14,'2012-11-11 15:00:00',69),(1010,15,'2011-12-11 10:00:00',71),(1010,16,'2010-09-11 10:00:00',66),(1011,1,'2013-11-11 16:00:00',62),(1011,2,'2012-11-10 10:00:00',72),(1011,3,'2011-12-19 10:00:00',96),(1011,4,'2010-11-18 11:00:00',64),(1011,5,'2013-11-11 14:00:00',89),(1011,6,'2012-09-13 15:00:00',91),(1011,7,'2011-10-16 16:00:00',95),(1011,8,'2010-11-11 16:00:00',96),(1011,9,'2013-11-21 10:00:00',89),(1011,10,'2012-11-11 12:00:00',73),(1011,11,'2011-11-11 14:00:00',82),(1011,12,'2010-11-11 15:00:00',98),(1011,13,'2013-11-11 14:00:00',66),(1011,14,'2012-11-11 15:00:00',69),(1011,15,'2011-12-11 10:00:00',91),(1011,16,'2010-09-11 10:00:00',69),(1012,1,'2013-11-11 16:00:00',86),(1012,2,'2012-11-10 10:00:00',66),(1012,3,'2011-12-19 10:00:00',97),(1012,4,'2010-11-18 11:00:00',69),(1012,5,'2013-11-11 14:00:00',70),(1012,6,'2012-09-13 15:00:00',74),(1012,7,'2011-10-16 16:00:00',91),(1012,8,'2010-11-11 16:00:00',97),(1012,9,'2013-11-21 10:00:00',84),(1012,10,'2012-11-11 12:00:00',82),(1012,11,'2011-11-11 14:00:00',90),(1012,12,'2010-11-11 15:00:00',91),(1012,13,'2013-11-11 14:00:00',91),(1012,14,'2012-11-11 15:00:00',97),(1012,15,'2011-12-11 10:00:00',85),(1012,16,'2010-09-11 10:00:00',90),(1013,1,'2013-11-11 16:00:00',73),(1013,2,'2012-11-10 10:00:00',69),(1013,3,'2011-12-19 10:00:00',91),(1013,4,'2010-11-18 11:00:00',72),(1013,5,'2013-11-11 14:00:00',76),(1013,6,'2012-09-13 15:00:00',87),(1013,7,'2011-10-16 16:00:00',61),(1013,8,'2010-11-11 16:00:00',77),(1013,9,'2013-11-21 10:00:00',83),(1013,10,'2012-11-11 12:00:00',99),(1013,11,'2011-11-11 14:00:00',91),(1013,12,'2010-11-11 15:00:00',84),(1013,13,'2013-11-11 14:00:00',98),(1013,14,'2012-11-11 15:00:00',74),(1013,15,'2011-12-11 10:00:00',92),(1013,16,'2010-09-11 10:00:00',90),(1014,1,'2013-11-11 16:00:00',64),(1014,2,'2012-11-10 10:00:00',81),(1014,3,'2011-12-19 10:00:00',79),(1014,4,'2010-11-18 11:00:00',74),(1014,5,'2013-11-11 14:00:00',65),(1014,6,'2012-09-13 15:00:00',88),(1014,7,'2011-10-16 16:00:00',86),(1014,8,'2010-11-11 16:00:00',77),(1014,9,'2013-11-21 10:00:00',86),(1014,10,'2012-11-11 12:00:00',85),(1014,11,'2011-11-11 14:00:00',86),(1014,12,'2010-11-11 15:00:00',75),(1014,13,'2013-11-11 14:00:00',89),(1014,14,'2012-11-11 15:00:00',79),(1014,15,'2011-12-11 10:00:00',73),(1014,16,'2010-09-11 10:00:00',68),(1015,1,'2013-11-11 16:00:00',99),(1015,2,'2012-11-10 10:00:00',60),(1015,3,'2011-12-19 10:00:00',60),(1015,4,'2010-11-18 11:00:00',75),(1015,5,'2013-11-11 14:00:00',78),(1015,6,'2012-09-13 15:00:00',78),(1015,7,'2011-10-16 16:00:00',84),(1015,8,'2010-11-11 16:00:00',95),(1015,9,'2013-11-21 10:00:00',93),(1015,10,'2012-11-11 12:00:00',79),(1015,11,'2011-11-11 14:00:00',74),(1015,12,'2010-11-11 15:00:00',65),(1015,13,'2013-11-11 14:00:00',63),(1015,14,'2012-11-11 15:00:00',74),(1015,15,'2011-12-11 10:00:00',67),(1015,16,'2010-09-11 10:00:00',65),(1016,1,'2013-11-11 16:00:00',97),(1016,2,'2012-11-10 10:00:00',90),(1016,3,'2011-12-19 10:00:00',77),(1016,4,'2010-11-18 11:00:00',75),(1016,5,'2013-11-11 14:00:00',75),(1016,6,'2012-09-13 15:00:00',97),(1016,7,'2011-10-16 16:00:00',96),(1016,8,'2010-11-11 16:00:00',92),(1016,9,'2013-11-21 10:00:00',62),(1016,10,'2012-11-11 12:00:00',83),(1016,11,'2011-11-11 14:00:00',98),(1016,12,'2010-11-11 15:00:00',94),(1016,13,'2013-11-11 14:00:00',62),(1016,14,'2012-11-11 15:00:00',97),(1016,15,'2011-12-11 10:00:00',76),(1016,16,'2010-09-11 10:00:00',82),(1017,1,'2013-11-11 16:00:00',100),(1017,2,'2012-11-10 10:00:00',88),(1017,3,'2011-12-19 10:00:00',86),(1017,4,'2010-11-18 11:00:00',73),(1017,5,'2013-11-11 14:00:00',96),(1017,6,'2012-09-13 15:00:00',64),(1017,7,'2011-10-16 16:00:00',81),(1017,8,'2010-11-11 16:00:00',66),(1017,9,'2013-11-21 10:00:00',76),(1017,10,'2012-11-11 12:00:00',95),(1017,11,'2011-11-11 14:00:00',73),(1017,12,'2010-11-11 15:00:00',82),(1017,13,'2013-11-11 14:00:00',85),(1017,14,'2012-11-11 15:00:00',68),(1017,15,'2011-12-11 10:00:00',99),(1017,16,'2010-09-11 10:00:00',76);

#
# Structure for table "student"
#

DROP TABLE IF EXISTS `student`;
CREATE TABLE `student` (
  `StudentNo` int(4) NOT NULL COMMENT '学号',
  `LoginPwd` varchar(20) DEFAULT NULL,
  `StudentName` varchar(20) DEFAULT NULL COMMENT '学生姓名',
  `Sex` tinyint(1) DEFAULT NULL COMMENT '性别，取值0或1',
  `GradeId` int(11) DEFAULT NULL COMMENT '年级编号',
  `Phone` varchar(50) NOT NULL COMMENT '联系电话，允许为空，即可选输入',
  `Address` varchar(255) NOT NULL COMMENT '地址，允许为空，即可选输入',
  `BornDate` datetime DEFAULT NULL COMMENT '出生时间',
  `Email` varchar(50) NOT NULL COMMENT '邮箱账号，允许为空，即可选输入',
  `IdentityCard` varchar(18) DEFAULT NULL COMMENT '身份证号',
  PRIMARY KEY (`StudentNo`),
  UNIQUE KEY `IdentityCard` (`IdentityCard`),
  KEY `Email` (`Email`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8;

#
# Data for table "student"
#

/*!40000 ALTER TABLE `student` DISABLE KEYS */;
INSERT INTO `student` VALUES (1000,'111111','郭靖',1,1,'13500000001','北京海淀区中关村大街1号','1986-12-11 00:00:00','test1@bdqn.cn','450323198612111234'),(1001,'123456','李文才',1,2,'13500000002','河南洛阳','1981-12-31 00:00:00','test1@bdqn.cn','450323198112311234'),(1002,'111111','李斯文',1,1,'13500000003','天津市和平区','1986-11-30 00:00:00','test1@bdqn.cn','450323198611301234'),(1003,'123456','武松',1,3,'13500000004','上海卢湾区','1986-12-31 00:00:00','test1@bdqn.cn','450323198612314234'),(1004,'123456','张三',1,4,'13500000005','北京市通州','1989-12-31 00:00:00','test1@bdqn.cn','450323198612311244'),(1005,'123456','张秋丽 ',2,1,'13500000006','广西桂林市灵川','1986-12-31 00:00:00','test1@bdqn.cn','450323198612311214'),(1006,'123456','肖梅',2,4,'13500000007','地址不详','1986-12-31 00:00:00','test1@bdqn.cn','450323198612311134'),(1007,'111111','欧阳峻峰',1,1,'13500000008','北京东城区','1986-12-31 00:00:00','test1@bdqn.cn','450323198612311133'),(1008,'111111','梅超风',1,1,'13500000009','河南洛阳','1986-12-31 00:00:00','test1@bdqn.cn','450323198612311221'),(1009,'123456','刘毅',1,2,'13500000011','安徽','1986-12-31 00:00:00','test1@bdqn.cn','450323198612311231'),(1010,'111111','大凡',1,1,'13500000012','河南洛阳','1986-12-31 00:00:00','test1@bdqn.cn','450323198612311044'),(1011,'111111','奥丹斯',1,1,'13500000013','北京海淀区中关村大街*号','1984-12-31 00:00:00','test1@bdqn.cn','450323198412311234'),(1012,'123456','多伦',2,3,'13500000014','广西南宁中央大街','1986-12-31 00:00:00','test1@bdqn.cn','450323198612311334'),(1013,'123456','李梅',2,1,'13500000015','上海卢湾区','1986-12-31 00:00:00','test1@bdqn.cn','450323198612311534'),(1014,'123456','张得',2,4,'13500000016','北京海淀区中关村大街*号','1986-12-31 00:00:00','test1@bdqn.cn','450323198612311264'),(1015,'123456','李东方',1,4,'13500000017','广西桂林市灵川','1976-12-31 00:00:00','test1@bdqn.cn','450323197612311234'),(1016,'111111','刘奋斗',1,1,'13500000018','上海卢湾区','1986-12-31 00:00:00','test1@bdqn.cn','450323198612311251'),(1017,'123456','可可',2,3,'13500000019','北京长安街1号','1981-09-10 00:00:00','test1@bdqn.cn','450323198109108311'),(10066,'','Tom',1,1,'13500000000','','0000-00-00 00:00:00','email@22.com','33123123123123123');
/*!40000 ALTER TABLE `student` ENABLE KEYS */;

#
# Structure for table "subject"
#

DROP TABLE IF EXISTS `subject`;
CREATE TABLE `subject` (
  `SubjectNo` int(11) NOT NULL AUTO_INCREMENT COMMENT '课程编号',
  `SubjectName` varchar(50) DEFAULT NULL COMMENT '课程名称',
  `ClassHour` int(4) DEFAULT NULL COMMENT '学时',
  `GradeID` int(4) DEFAULT NULL COMMENT '年级编号',
  PRIMARY KEY (`SubjectNo`)
) ENGINE=InnoDB AUTO_INCREMENT=18 DEFAULT CHARSET=utf8;

#
# Data for table "subject"
#

INSERT INTO `subject` VALUES (1,'高等数学-1',110,1),(2,'高等数学-2',110,2),(3,'高等数学-3',100,3),(4,'高等数学-4',130,4),(5,'C语言-1',110,1),(6,'C语言-2',110,2),(7,'C语言-3',100,3),(8,'C语言-4',130,4),(9,'JAVA第一学年',110,1),(10,'JAVA第二学年',110,2),(11,'JAVA第三学年',100,3),(12,'JAVA第四学年',130,4),(13,'数据库结构-1',110,1),(14,'数据库结构-2',110,2),(15,'数据库结构-3',100,3),(16,'数据库结构-4',130,4),(17,'C#基础',130,1);

GROUP BY 语句

基本用法：

SELECT * from student GROUP BY Sex ;

image.png

GROUP BY 语句中的GROUP_CONCAT()函数

这下对基本用法就很好理解了。因为他默认只显示了组中一条记录，如果想看组内所以的用户信息，就需要用到GROUP_CONCAT()函数。

SELECT GROUP_CONCAT(StudentName) AS StudentName ,
         GROUP_CONCAT(Phone) AS Phone
FROM student
GROUP BY  Sex ;

image.png

COUNT()函数：统计记录总数

SELECT GROUP_CONCAT(StudentName) AS StudentName ,
         GROUP_CONCAT(Phone) AS Phone
FROM student
GROUP BY  Sex ;

image.png

加WHERE条件

SELECT COUNT(*) AS total ,
         GROUP_CONCAT(StudentName) AS StudentName ,
         GROUP_CONCAT(Phone) AS Phone
FROM student
WHERE GradeId >= 3
GROUP BY  Sex ;

image.png

聚合函数：

SUM()求和函数
MAX()函数：求最大值
MIN()函数：求最小值
AVG()函数：求平均值

mysql中这些关键字是按照如下顺序进行执行的：

Where, Group By, Having, Order by。

sql之left join、right join、inner join的区别

image.png

题目一：

#查询参加了考试的同学信息(学号,学生姓名,科目编号,分数)
SELECT * FROM student;
SELECT * FROM result;
/*思路:
(1):分析需求,确定查询的列来源于两个类,student  result,连接查询
(2):确定使用哪种连接查询?(内连接)
*/
SELECT s.studentno,studentname,subjectno,StudentResult
FROM student s
INNER JOIN result r
ON r.studentno = s.studentno

# 右连接(也可实现)
SELECT s.studentno,studentname,subjectno,StudentResult
FROM student s
RIGHT JOIN result r
ON r.studentno = s.studentno

# 等值连接
SELECT s.studentno,studentname,subjectno,StudentResult
FROM student s , result r
WHERE r.studentno = s.studentno

# 左连接 (查询了所有同学,不考试的也会查出来)
SELECT s.studentno,studentname,subjectno,StudentResult
FROM student s
LEFT JOIN result r
ON r.studentno = s.studentno

#查一下缺考的同学(左连接应用场景)
SELECT s.studentno,studentname,subjectno,StudentResult
FROM student s
LEFT JOIN result r
ON r.studentno = s.studentno
WHERE StudentResult IS NULL

#思考题:查询参加了考试的同学信息(学号,学生姓名,科目名,分数)
SELECT s.studentno,studentname,subjectname,StudentResult
FROM student s
INNER JOIN result r
ON r.studentno = s.studentno
INNER JOIN `subject` sub
ON sub.subjectno = r.subjectno

题目二

#思考题:查询参加了考试的同学信息(学号,学生姓名,科目名,分数)
SELECT s.studentno,studentname,subjectname,StudentResult
FROM student s
INNER JOIN result r
ON r.studentno = s.studentno
INNER JOIN `subject` sub
ON sub.subjectno = r.subjectno

# 查询学员及所属的年级(学号,学生姓名,年级名)
SELECT studentno AS 学号,studentname AS 学生姓名,gradename AS 年级名称
FROM student s
INNER JOIN grade g
ON s.`GradeId` = g.`GradeID`

# 查询科目及所属的年级(科目名称,年级名称)
SELECT subjectname AS 科目名称,gradename AS 年级名称
FROM SUBJECT sub
INNER JOIN grade g
ON sub.gradeid = g.gradeid

# 查询 数据库结构-1 的所有考试结果(学号 学生姓名 科目名称 成绩)
SELECT s.studentno,studentname,subjectname,StudentResult
FROM student s
INNER JOIN result r
ON r.studentno = s.studentno
INNER JOIN `subject` sub
ON r.subjectno = sub.subjectno
WHERE subjectname='数据库结构-1'

题目三：

/*============== 子查询 ================
什么是子查询?
    在查询语句中的WHERE条件子句中,又嵌套了另一个查询语句
    嵌套查询可由多个子查询组成,求解的方式是由里及外;
    子查询返回的结果一般都是集合,故而建议使用IN关键字;
*/

# 查询 数据库结构-1 的所有考试结果(学号,科目编号,成绩),并且成绩降序排列
#方法一:使用连接查询
SELECT studentno,r.subjectno,StudentResult
FROM result r 
INNER JOIN `subject` sub
ON r.`SubjectNo`=sub.`SubjectNo`
WHERE subjectname = '数据库结构-1'
ORDER BY studentresult DESC;

#方法二:使用子查询(执行顺序:由里及外)
SELECT studentno,subjectno,StudentResult
FROM result
WHERE subjectno=(
    SELECT subjectno FROM `subject` 
    WHERE subjectname = '数据库结构-1'
)
ORDER BY studentresult DESC;

#查询课程为 高等数学-2 且分数不小于80分的学生的学号和姓名
#方法一:使用连接查询
SELECT s.studentno,studentname
FROM student s
INNER JOIN result r
ON s.`StudentNo` = r.`StudentNo`
INNER JOIN `subject` sub
ON sub.`SubjectNo` = r.`SubjectNo`
WHERE subjectname = '高等数学-2' AND StudentResult>=80

#方法二:使用连接查询+子查询
#分数不小于80分的学生的学号和姓名
SELECT r.studentno,studentname FROM student s
INNER JOIN result r ON s.`StudentNo`=r.`StudentNo`
WHERE StudentResult>=80

#在上面SQL基础上,添加需求:课程为 高等数学-2
SELECT r.studentno,studentname FROM student s
INNER JOIN result r ON s.`StudentNo`=r.`StudentNo`
WHERE StudentResult>=80 AND subjectno=(
    SELECT subjectno FROM `subject`
    WHERE subjectname = '高等数学-2'
)

#方法三:使用子查询
#分步写简单sql语句,然后将其嵌套起来
SELECT studentno,studentname FROM student WHERE studentno IN(
    SELECT studentno FROM result WHERE StudentResult>=80 AND subjectno=(
        SELECT subjectno FROM `subject` WHERE subjectname = '高等数学-2'
    )
)

/*
练习题目:
    查 C语言-1 的前5名学生的成绩信息(学号,姓名,分数)
    使用子查询,查询郭靖同学所在的年级名称
*/

7.27 mysql练习

mysql练习题目:

GROUP BY 语句

mysql中这些关键字是按照如下顺序进行执行的：

sql之left join、right join、inner join的区别

题目一：

题目二

题目三：

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