0 Preparación de datos
student.txt
Los campos representan de izquierda a derecha:
学号 学生姓名 学生性别 学生出生年月 学生所在班级
108 丘东 男 1977-09-01 95033
105 匡明 男 1975-10-02 95031
107 王丽 女 1976-01-23 95033
101 李军 男 1976-02-20 95033
109 王芳 女 1975-02-10 95031
103 陆君 男 1974-06-03 95031
course.txt
课程号 课程名称 教工编号
3-105 计算机导论 825
3-245 操作系统 804
6-166 数字电路 856
9-888 高等数学 831
score.txt
学号 课程号 成绩
103 3-245 86
105 3-245 75
109 3-245 68
103 3-105 92
105 3-105 88
109 3-105 76
101 3-105 64
107 3-105 91
108 3-105 78
101 6-166 85
107 6-166 79
108 6-166 81
teacher.txt
教工编号 教工姓名 教工性别 教工出生年月 职称 教工所在部门
804 李诚 男 1958-12-02 副教授 计算机系
856 张旭 男 1969-03-12 讲师 电子工程系
825 王萍 女 1972-05-05 助教 计算机系
831 刘冰 女 1977-08-14 助教 电子工程系1 tema
- 1. Consultar los registros de la clase "95031" o compañeros cuyo género sea "femenino" en la tabla Alumno.
- 2. Consultar todos los registros de la tabla de Estudiantes en orden descendente de Clase y en orden ascendente.
- 3. Consultar todos los registros de la tabla Score en orden ascendente de Cno y en orden descendente de Grado.
- 4. Pregunte sobre los alumnos de la clase "95031".
- 5. Consulte el número de estudiante y el número de curso con la puntuación más alta en la tabla de puntuación. (Subconsulta u ordenar)
- 6. Consultar la nota media de cada curso.
- 7. Consulte los puntajes promedio de los cursos que tienen al menos 5 estudiantes electivos y comience con 3 en la tabla Puntaje.
- 8. Consulte la columna Sno con una puntuación superior a 70 e inferior a 90.
- 9. Consultar las columnas Sname, Cno y Degree de todos los estudiantes.
- 10. Consulte las columnas Sno, Cname y Degree de todos los estudiantes.
- 11. Consulte las columnas Sname, Cname y Degree de todos los estudiantes.
- 12. Consultar la puntuación media de los alumnos de la clase "95033".
- 13. Consultar las transcripciones de todos los estudiantes "mujeres" que tomaron el curso "Introducción a la Computación".
- 14. Consultar los expedientes de todos los alumnos cuyas calificaciones de la asignatura optativa "3-105" sean superiores a las del alumno Nº "109".
- 15. Consultar el registro de los puntajes de los estudiantes que han elegido varios cursos en el puntaje que no son los puntajes más altos.
- 16. Pregunte sobre todos los registros superiores a aquellos con ID de estudiante "109" e ID de curso "3-105".
- 17. Consulte las columnas Sno, Sname y Birthday de todos los estudiantes que nacieron el mismo año que el estudiante cuya identificación de estudiante es 105.
- 18. Consulta los resultados de los alumnos de la clase de "Zhang Xu"
- 19. Consultar el nombre del profesor cuyo número de alumnos que realizan un curso es superior a 4
- 20. Consultar los registros de todos los alumnos de las clases 95033 y 95031
- 21. Consultar la existencia de cursos Cno con puntajes de 85 puntos o más
- 22. Consultar las transcripciones de los cursos impartidos por los profesores del "Departamento de Informática"
- 23. Consultar el Tname y Prof de profesores con diferentes títulos en el "Departamento de Informática" y "Departamento de Ingeniería Electrónica"
- 24. Consultar el Cno, Sno y Grado de los estudiantes cuyo número electivo es "3-105" y sus calificaciones son al menos más altas que las de los estudiantes cuyo número electivo es "3-245", y ordenar por grado de mayor a menor.
- 25. Consultar el Cno, Sno y Grado de los alumnos cuyo número de electiva es "3-105" y cuyas calificaciones son superiores a las del número de electiva "3-245"
- 26. Consultar el nombre, sexo y fecha de nacimiento de todos los profesores y compañeros
- 27. Consultar el nombre, sexo y fecha de nacimiento de todas las maestras "mujeres" y compañeras de clase "femeninas".
- 28. Consultar los expedientes académicos de los alumnos cuyas calificaciones sean inferiores a la nota media del curso.
- 29. Consultar el Tname y Depart de todos los profesores
- 30. Consultar el Tname y Depart de todos los profesores que no han impartido clases.
- 31. Consultar el número de clase de al menos 2 niños
- 32. Consultar los registros de los estudiantes cuyo apellido no es "王" en la tabla de Estudiantes
- 33. Consulte el nombre y la edad de cada estudiante en la tabla de Estudiantes.
- 34. Consultar los valores de fecha de sábado más grandes y más pequeños en la tabla de Estudiantes. (Formato de tiempo máximo y mínimo)
- 35. Consulte todos los registros de la tabla de Estudiantes en orden descendente de número de clase y edad. Ordenar los resultados de la consulta
- 36. Consultar a los profesores "varones" y sus cursos
- 37. Consultar las columnas Sno, Cno y Degree de los estudiantes con la puntuación más alta
- 38. Consulta los Snames de todos los estudiantes del mismo género que "Li Jun"
- 39. Consulta el nombre de compañeros del mismo sexo que "Li Jun" y de la misma clase
- 40. Consultar los expedientes académicos de todos los estudiantes "varones" que toman el curso "Introducción a la informática".
- 41. Consultar las columnas Sname, Ssex y Class de todos los registros de la tabla Student
- 42. Consultar todas las unidades del profesor, es decir, la columna Salida única
- 43. Consultar todos los registros de la tabla de estudiantes
- 44. Consultar todos los registros de la tabla Score cuyas puntuaciones estén entre 60 y 80
- 45. Consultar el registro de 85, 86 u 88 en la tabla de puntuación
2 Plantilla de código
import org.apache.spark.SparkContext
import org.apache.spark.rdd.RDD
import org.apache.spark.sql.{Dataset, SparkSession}
/*
* @Auther:
* @Date:
* @Description: SparkSql代码开发模板
*/
object demo{
// 定义样例类封装数据
case class Student(Sno:String,Sname:String,Ssex:String,Sbirthday:String,Class:String)
case class Course(Cno:String,Cname:String,Tno:String)
case class Score(Sno:String,Cno:String,Degree:String)
case class Teacher(Tno:String,Tname:String,Tsex:String,Tbirthday:String,Prof:String,Depart:String)
def main(args: Array[String]): Unit = {
// 1. 创建SparkSession
val spark: SparkSession = SparkSession.builder().master("local[*]").appName("demo06").getOrCreate()
val sc: SparkContext = spark.sparkContext
// 设置日志级别
sc.setLogLevel("WARN")
// 读取test文件，加载数据
val rdd1: RDD[String] = sc.textFile("E:\\2020大数据新学年\\BigData\\05-Spark\\0417\\4.16号练习题50道2.0\\data\\student.txt")
val rdd2: RDD[String] = sc.textFile("E:\\2020大数据新学年\\BigData\\05-Spark\\0417\\4.16号练习题50道2.0\\data\\course.txt")
val rdd3: RDD[String] = sc.textFile("E:\\2020大数据新学年\\BigData\\05-Spark\\0417\\4.16号练习题50道2.0\\data\\score.txt")
val rdd4: RDD[String] = sc.textFile("E:\\2020大数据新学年\\BigData\\05-Spark\\0417\\4.16号练习题50道2.0\\data\\teacher.txt")
val student: RDD[Student] = rdd1.map(x=>{val str = x.split("\t");Student(str(0),str(1),str(2),str(3),str(4))})
val course: RDD[Course] = rdd2.map(x=>{val str = x.split("\t");Course(str(0),str(1),str(2))})
val score: RDD[Score] = rdd3.map(x=>{val str = x.split("\t");Score(str(0),str(1),str(2))})
val teacher: RDD[Teacher] = rdd4.map(x=>{val str = x.split("\t");Teacher(str(0),str(1),str(2),str(3),str(4),str(5))})
// 导入隐式转换
import spark.implicits._
// 将RDD转换成DF
val stuframe = student.toDF()
val couframe = course.toDF()
val scoframe = score.toDF()
val teaframe = teacher.toDF()
// 创建临时表
stuframe.createOrReplaceTempView("student")
couframe.createOrReplaceTempView("course")
scoframe.createOrReplaceTempView("score")
teaframe.createOrReplaceTempView("teacher")
/* 6. 查询Student表中“95031”班或性别为“女”的同学记录*/
spark.sql("Select * from student where sno = '95031' or ssex = '女'").show()
//+---+-----+----+----------+-----+
//|Sno|Sname|Ssex| Sbirthday|Class|
//+---+-----+----+----------+-----+
//|107| 王丽| 女|1976-01-23|95033|
//|109| 王芳| 女|1975-02-10|95031|
//+---+-----+----+----------+-----+
/* 7. 以Class降序,升序查询Student表的所有记录 */
spark.sql("Select * from student order by class desc").show()
//+---+-----+----+----------+-----+
//|Sno|Sname|Ssex| Sbirthday|Class|
//+---+-----+----+----------+-----+
//|107| 王丽| 女|1976-01-23|95033|
//|101| 李军| 男|1976-02-20|95033|
//|108| 丘东| 男|1977-09-01|95033|
//|105| 匡明| 男|1975-10-02|95031|
//|109| 王芳| 女|1975-02-10|95031|
//|103| 陆君| 男|1974-06-03|95031|
//+---+-----+----+----------+-----+
/* 8. 以Cno升序、Degree降序查询Score表的所有记录。 */
spark.sql("Select * from score order by cno,degree desc").show()
//+---+-----+------+
//|Sno| Cno|Degree|
//+---+-----+------+
//|103|3-105| 92|
//|107|3-105| 91|
//|105|3-105| 88|
//|108|3-105| 78|
//|109|3-105| 76|
//|101|3-105| 64|
//|103|3-245| 86|
//|105|3-245| 75|
//|109|3-245| 68|
//|101|6-166| 85|
//|108|6-166| 81|
//|107|6-166| 79|
//+---+-----+------+
/* 9. 查询“95031”班的学生。 */
spark.sql("Select sname from student where class = '95031'").show()
//+-----+
//|sname|
//+-----+
//| 匡明|
//| 王芳|
//| 陆君|
//+-----+
/* 10. 查询Score表中的最高分的学生学号和课程号。（子查询或者排序） */
spark.sql("Select sno,cno from score order by degree desc limit 1").show()
//+---+-----+
//|sno| cno|
//+---+-----+
//|103|3-105|
//+---+-----+
/* 11. 查询每门课的平均成绩。 */
spark.sql("Select first(course.Cname),avg(degree) from score,course where score.Cno = course.Cno group by score.Cno").show()
//+-------------------+---------------------------+
//|first(Cname, false)|avg(CAST(degree AS DOUBLE))|
//+-------------------+---------------------------+
//| 数字电路| 81.66666666666667|
//| 操作系统| 76.33333333333333|
//| 计算机导论| 81.5|
//+-------------------+---------------------------+
/* 12. 查询Score表中至少有5名学生选修的并以3开头的课程的平均分数。 */
spark.sql("Select first(cno),avg(Degree) from score where cno like '3%' group by cno having count(cno) >= 5").show()
//+-----------------+---------------------------+
//|first(cno, false)|avg(CAST(Degree AS DOUBLE))|
//+-----------------+---------------------------+
//| 3-105| 81.5|
//+-----------------+---------------------------+
/* 13.查询分数大于70，小于90的Sno列 */
spark.sql("Select sno from score where Degree > 70 and Degree < 90 ").show()
//+---+
//|sno|
//+---+
//|103|
//|105|
//|105|
//|109|
//|108|
//|101|
//|107|
//|108|
//+---+
/* 14.查询所有学生的Sname、Cno和Degree列。 */
spark.sql("select sname,cno,degree from score,student where score.sno = student.sno").show()
//+-----+-----+------+
//|sname| cno|degree|
//+-----+-----+------+
//| 李军|3-105| 64|
//| 李军|6-166| 85|
//| 王丽|3-105| 91|
//| 王丽|6-166| 79|
//| 陆君|3-245| 86|
//| 陆君|3-105| 92|
//| 丘东|3-105| 78|
//| 丘东|6-166| 81|
//| 匡明|3-245| 75|
//| 匡明|3-105| 88|
//| 王芳|3-245| 68|
//| 王芳|3-105| 76|
//+-----+-----+------+
/* 15.查询所有学生的Sno、Cname和Degree列。 */
spark.sql("select sno,cname,degree from score,course where score.cno=course.cno").show()
//+---+-----+------+
//|sno|cname|degree|
//+---+-----+------+
//|101| 数字电路| 85|
//|107| 数字电路| 79|
//|108| 数字电路| 81|
//|103| 操作系统| 86|
//|105| 操作系统| 75|
//|109| 操作系统| 68|
//|103|计算机导论| 92|
//|105|计算机导论| 88|
//|109|计算机导论| 76|
//|101|计算机导论| 64|
//|107|计算机导论| 91|
//|108|计算机导论| 78|
//+---+-----+------+
/* 16.查询所有学生的Sname、Cname和Degree列。 */
spark.sql(
"""
|select sname,cname,degree from score,course,student
|where score.cno = course.cno and student.sno = score.sno
""".stripMargin).show()
//+-----+-----+------+
//|sname|cname|degree|
//+-----+-----+------+
//| 李军| 数字电路| 85|
//| 李军|计算机导论| 64|
//| 王丽| 数字电路| 79|
//| 王丽|计算机导论| 91|
//| 陆君| 操作系统| 86|
//| 陆君|计算机导论| 92|
//| 丘东| 数字电路| 81|
//| 丘东|计算机导论| 78|
//| 匡明| 操作系统| 75|
//| 匡明|计算机导论| 88|
//| 王芳| 操作系统| 68|
//| 王芳|计算机导论| 76|
//+-----+-----+------+
/* 17.查询“95033”班学生的平均分。*/
spark.sql("select first(class),avg(Degree) from student,score where student.sno = score.sno and class = '95033'").show()
//+-------------------+---------------------------+
//|first(class, false)|avg(CAST(Degree AS DOUBLE))|
//+-------------------+---------------------------+
//| 95033| 79.66666666666667|
//+-------------------+---------------------------+
/* 18.查询所有选修“计算机导论”课程的“女”同学的成绩表。 */
spark.sql(
"""
|select sname,cname,ssex,Degree from student,course,score
|where student.sno = score.sno and course.cno=score.cno
|and ssex = "女" and cname = "计算机导论"
""".stripMargin).show()
//|sname|cname|ssex|Degree|
//+-----+-----+----+------+
//| 王丽|计算机导论| 女| 91|
//| 王芳|计算机导论| 女| 76|
//+-----+-----+----+------+
/* 19.查询选修“3-105”课程的成绩高于“109”号同学成绩的所有同学的记录。*/
spark.sql(
"""
|select * from score where cno = "3-105" and degree > (select degree from score where sno = "109" and cno = "3-105" )
|
""".stripMargin).show()
//+---+-----+------+
//|Sno| Cno|Degree|
//+---+-----+------+
//|103|3-105| 92|
//|105|3-105| 88|
//|107|3-105| 91|
//|108|3-105| 78|
//+---+-----+------+
/* 20.查询score中选学多门课程的同学中分数为非最高分成绩的记录。 */
// spark.sql(
// """
// |select first(sno),first(cno),first(degree) from score a where sno in
// |(select sno from score group by sno having count(*)>1)
// |and degree<(select max(degree) from score b where a.cno=b.cno)
// """.stripMargin).show()
spark.sql("select * from score a where sno in (select sno from score group by sno having count(*)>1) and degree<(select max(degree) from score b where a.cno=b.cno )").show()
//+---+-----+------+
//|Sno| Cno|Degree|
//+---+-----+------+
//|107|6-166| 79|
//|108|6-166| 81|
//|105|3-245| 75|
//|109|3-245| 68|
//|101|3-105| 64|
//|107|3-105| 91|
//|108|3-105| 78|
//|105|3-105| 88|
//|109|3-105| 76|
//+---+-----+------+
/* 21.查询成绩高于学号为“109”、课程号为“3-105”的成绩的所有记录。 */
spark.sql("select * from score where degree > (select degree from score where sno = '109' and cno = '3-105')").show()
//+---+-----+------+
//|Sno| Cno|Degree|
//+---+-----+------+
//|103|3-245| 86|
//|103|3-105| 92|
//|105|3-105| 88|
//|107|3-105| 91|
//|108|3-105| 78|
//|101|6-166| 85|
//|107|6-166| 79|
//|108|6-166| 81|
//+---+-----+------+
/* 22. 查询和学号为105的同学同年出生的所有学生的Sno、Sname和Sbirthday列。*/
spark.udf.register("sub",(str:String,num1:Int,num2:Int)=>str.substring(num1,num2))
spark.sql("select sno,sname,sbirthday from student where sub(Sbirthday,0,5) = (select sub(Sbirthday,0,5) from student where sno = '105') ").show()
//+---+-----+----------+
//|sno|sname| sbirthday|
//+---+-----+----------+
//|105| 匡明|1975-10-02|
//|109| 王芳|1975-02-10|
//+---+-----+----------+
/* 23. 查询“张旭“教师任课的学生成绩 */
spark.sql(
"""
|select sno,degree from score,course,teacher
|where tname = "张旭" and teacher.tno = course.tno
|and course.Cno = score.Cno
""".stripMargin).show()
//+---+------+
//|sno|degree|
//+---+------+
//|101| 85|
//|107| 79|
//|108| 81|
//+---+------+
/* 24. 查询选修某课程的同学人数多于4人的教师姓名。 */
spark.sql(
"""
|select first(tname) from teacher,score,course
|where teacher.tno = course.tno
|and course.Cno = score.Cno
|group by score.Cno having count(score.Cno) > 4
""".stripMargin).show()
//+-------------------+
//|first(tname, false)|
//+-------------------+
//| 王萍|
//+-------------------+
/* 25. 查询95033班和95031班全体学生的记录。 */
spark.sql("select * from student where class= '95033' or class = '95031'").show()
//+---+-----+----+----------+-----+
//|Sno|Sname|Ssex| Sbirthday|Class|
//+---+-----+----+----------+-----+
//|108| 丘东| 男|1977-09-01|95033|
//|105| 匡明| 男|1975-10-02|95031|
//|107| 王丽| 女|1976-01-23|95033|
//|101| 李军| 男|1976-02-20|95033|
//|109| 王芳| 女|1975-02-10|95031|
//|103| 陆君| 男|1974-06-03|95031|
//+---+-----+----+----------+-----+
/* 26. 查询存在有85分以上成绩的课程Cno. */
spark.sql("select distinct cno from score where degree >= 85").show()
//+-----+
//| cno|
//+-----+
//|6-166|
//|3-245|
//|3-105|
//+-----+
/* 27. 查询出“计算机系“教师所教课程的成绩表。 */
spark.sql(
"""
|select score.* from score,Course,teacher
|where teacher.tno = course.tno
|and course.Cno = score.Cno
|and teacher.Depart = "计算机系"
""".stripMargin).show()
//+---+-----+------+
//|Sno| Cno|Degree|
//+---+-----+------+
//|103|3-105| 92|
//|105|3-105| 88|
//|109|3-105| 76|
//|101|3-105| 64|
//|107|3-105| 91|
//|108|3-105| 78|
//|103|3-245| 86|
//|105|3-245| 75|
//|109|3-245| 68|
//+---+-----+------+
/* 28. 查询“计算机系”与“电子工程系“不同职称的教师的Tname和Prof */
spark.sql(
"""
|select tname,prof from teacher where depart = '计算机系' and prof not in
|(select prof from teacher where depart = '电子工程系')
""".stripMargin).show()
//+-----+----+
//|tname|prof|
//+-----+----+
//| 李诚| 副教授|
//+-----+----+
/* 29. 查询选修编号为“3-105“课程且成绩至少高于选修编号为“3-245”的同学的Cno、Sno和Degree,并按Degree从高到低次序排序。 */
spark.sql(
"""
|select s1.cno,s1.sno,s1.degree from score s1,score s2
|where s1.cno = "3-105" and s2.cno = "3-245"
|and s1.Sno = s2.Sno
|and s1.degree > s2. degree
|order by s1.degree desc
""".stripMargin).show()
//+-----+---+------+
//| cno|sno|degree|
//+-----+---+------+
//|3-105|103| 92|
//|3-105|105| 88|
//|3-105|109| 76|
//+-----+---+------+
/* 30. 查询选修编号为“3-105”且成绩高于选修编号为“3-245”课程的同学的Cno、Sno和Degree. */
spark.sql(
"""
|select cno,sno,degree from score
|where cno = "3-105" and degree > (select max(degree) from score where cno = "3-245")
""".stripMargin).show()
//+-----+---+------+
//| cno|sno|degree|
//+-----+---+------+
//|3-105|103| 92|
//|3-105|105| 88|
//|3-105|107| 91|
//+-----+---+------+
/* 31. 查询所有教师和同学的name、sex和birthday. */
spark.sql(
"""
|select distinct Sname as name,Ssex as sex,Sbirthday as birthday from student
|union
|select distinct Tname as name,Tsex as sex,Tbirthday as birthday from Teacher
|
""".stripMargin).show()
//+----+---+----------+
//|name|sex| birthday|
//+----+---+----------+
//| 李诚| 男|1958-12-02|
//| 张旭| 男|1969-03-12|
//| 王萍| 女|1972-05-05|
//| 李军| 男|1976-02-20|
//| 匡明| 男|1975-10-02|
//| 刘冰| 女|1977-08-14|
//| 陆君| 男|1974-06-03|
//| 王芳| 女|1975-02-10|
//| 王丽| 女|1976-01-23|
//| 丘东| 男|1977-09-01|
//+----+---+----------+
/* 32. 查询所有“女”教师和“女”同学的name、sex和birthday. */
spark.sql(
"""
|select distinct Sname as name,Ssex as sex,Sbirthday as birthday from student where Ssex = "女"
|union
|select distinct Tname as name,Tsex as sex,Tbirthday as birthday from Teacher where Tsex = "女"
|
""".stripMargin).show()
//+----+---+----------+
//|name|sex| birthday|
//+----+---+----------+
//| 王萍| 女|1972-05-05|
//| 刘冰| 女|1977-08-14|
//| 王芳| 女|1975-02-10|
//| 王丽| 女|1976-01-23|
//+----+---+----------+
/* 33. 查询成绩比该课程平均成绩低的同学的成绩表。 */
spark.sql(
"""
|select * from score s1
|where degree < (select avg(degree) from score s2 where s1.Cno = s2.Cno)
""".stripMargin).show()
//+---+-----+------+
//|Sno| Cno|Degree|
//+---+-----+------+
//|107|6-166| 79|
//|108|6-166| 81|
//|105|3-245| 75|
//|109|3-245| 68|
//|109|3-105| 76|
//|101|3-105| 64|
//|108|3-105| 78|
//+---+-----+------+
/* 34. 查询所有任课教师的Tname和Depart. */
spark.sql(
"""
|select tname,depart from teacher
|where tno in (select tno from course where cno in (select distinct cno from score) )
""".stripMargin).show()
//+-----+------+
//|tname|depart|
//+-----+------+
//| 张旭| 电子工程系|
//| 王萍| 计算机系|
//| 李诚| 计算机系|
//+-----+------+
/* 35. 查询所有未讲课的教师的Tname和Depart. */
spark.sql(
"""
|select tname,depart from teacher
|where tno not in (select tno from course where cno in (select distinct cno from score) )
""".stripMargin).show()
//+-----+------+
//|tname|depart|
//+-----+------+
//| 刘冰| 电子工程系|
//+-----+------+
/* 36. 查询至少有2名男生的班号。 */
spark.sql(
"""
|select class from student
|where ssex = "男"
|group by class having count(class) >= 2
""".stripMargin).show()
//+-----+
//|class|
//+-----+
//|95033|
//|95031|
//+-----+
/* 37. 查询Student表中不姓“王”的同学记录。 */
spark.sql(
"""
|select * from student
|where sname not like "王%"
""".stripMargin).show()
//+---+-----+----+----------+-----+
//|Sno|Sname|Ssex| Sbirthday|Class|
//+---+-----+----+----------+-----+
//|108| 丘东| 男|1977-09-01|95033|
//|105| 匡明| 男|1975-10-02|95031|
//|101| 李军| 男|1976-02-20|95033|
//|103| 陆君| 男|1974-06-03|95031|
//+---+-----+----+----------+-----+
/* 38. 查询Student表中每个学生的姓名和年龄。将函数运用到spark sql中去计算，可以直接拿String的类型计算不需要再转换成数值型 默认是会转换成Double类型计算浮点型转整型 */
spark.sql(
"""
|select Sname,year(current_date)-year(Sbirthday) from student
""".stripMargin).show()
//+-----+------------------------------------------------------+
//|Sname|(year(current_date()) - year(CAST(Sbirthday AS DATE)))|
//+-----+------------------------------------------------------+
//| 丘东| 43|
//| 匡明| 45|
//| 王丽| 44|
//| 李军| 44|
//| 王芳| 45|
//| 陆君| 46|
//+-----+------------------------------------------------------+
/* 39. 查询Student表中最大和最小的Sbirthday日期值。 时间格式最大值,最小值*/
spark.sql(
"""
|select max(Sbirthday),min(Sbirthday) from student
""".stripMargin).show()
//+--------------+--------------+
//|max(Sbirthday)|min(Sbirthday)|
//+--------------+--------------+
//| 1977-09-01| 1974-06-03|
//+--------------+--------------+
/* 40. 以班号和年龄从大到小的顺序查询Student表中的全部记录。 查询结果排序*/
spark.sql(
"""
|select * from student order by class desc,year(current_date)-year(Sbirthday) desc
""".stripMargin).show()
//+---+-----+----+----------+-----+
//|Sno|Sname|Ssex| Sbirthday|Class|
//+---+-----+----+----------+-----+
//|107| 王丽| 女|1976-01-23|95033|
//|101| 李军| 男|1976-02-20|95033|
//|108| 丘东| 男|1977-09-01|95033|
//|103| 陆君| 男|1974-06-03|95031|
//|105| 匡明| 男|1975-10-02|95031|
//|109| 王芳| 女|1975-02-10|95031|
//+---+-----+----+----------+-----+
/* 41. 查询“男”教师及其所上的课程。 */
spark.sql(
"""
|select cname from course,teacher
|where teacher.Tno = course.Tno and Tsex = "男"
""".stripMargin).show()
//+-----+
//|cname|
//+-----+
//| 数字电路|
//| 操作系统|
//+-----+
/* 42. 查询最高分同学的Sno、Cno和Degree列。 */
spark.sql(
"""
|select * from score
|where degree = (select max(degree) from score)
""".stripMargin).show()
//+---+-----+------+
//|Sno| Cno|Degree|
//+---+-----+------+
//|103|3-105| 92|
//+---+-----+------+
/* 43. 查询和“李军”同性别的所有同学的Sname.*/
spark.sql(
"""
|select sname from student
|where ssex = (select ssex from student where sname = "李军") and sname != "李军"
""".stripMargin).show()
//+-----+
//|sname|
//+-----+
//| 丘东|
//| 匡明|
//| 李军|
//| 陆君|
//+-----+
/* 44. 查询和“李军”同性别并同班的同学Sname. */
spark.sql(
"""
|select distinct s1.sname from student s1,student s2
|where s1.ssex = s2.ssex and s1.class = s2.class
|and s1.sname != "李军"
""".stripMargin).show()
//+-----+
//|sname|
//+-----+
//| 陆君|
//| 匡明|
//| 王芳|
//| 王丽|
//| 丘东|
//+-----+
/* 45. 查询所有选修“计算机导论”课程的“男”同学的成绩表。 */
spark.sql(
"""
|select degree from score,student,course
|where score.cno = course.cno
|and score.sno = student.sno
|and student.ssex = "男"
|and course.cname = "计算机导论"
""".stripMargin).show()
//+------+
//|degree|
//+------+
//| 64|
//| 92|
//| 78|
//| 88|
//+------+
/* 46. 查询Student表中的所有记录的Sname、Ssex和Class列。 */
spark.sql(
"""
|select sname,ssex,class from student
""".stripMargin).show()
//+-----+----+-----+
//| 丘东| 男|95033|
//| 匡明| 男|95031|
//| 王丽| 女|95033|
//| 李军| 男|95033|
//| 王芳| 女|95031|
//| 陆君| 男|95031|
//+-----+----+-----+
/* 47. 查询教师所有的单位即不重复的Depart列。*/
spark.sql(
"""
|select distinct depart from teacher
""".stripMargin).show()
//+------+
//|depart|
//+------+
//| 电子工程系|
//| 计算机系|
//+------+
/* 48. 查询Student表的所有记录 */
spark.sql(
"""
|select * from student
""".stripMargin).show()
//+---+-----+----+----------+-----+
//|Sno|Sname|Ssex| Sbirthday|Class|
//+---+-----+----+----------+-----+
//|108| 丘东| 男|1977-09-01|95033|
//|105| 匡明| 男|1975-10-02|95031|
//|107| 王丽| 女|1976-01-23|95033|
//|101| 李军| 男|1976-02-20|95033|
//|109| 王芳| 女|1975-02-10|95031|
//|103| 陆君| 男|1974-06-03|95031|
//+---+-----+----+----------+-----+
/* 49. 查询Score表中成绩在60到80之间的所有记录。 */
spark.sql(
"""
|select * from score where degree > 60 and degree < 80
""".stripMargin).show()
//+---+-----+------+
//|Sno| Cno|Degree|
//+---+-----+------+
//|105|3-245| 75|
//|109|3-245| 68|
//|109|3-105| 76|
//|101|3-105| 64|
//|108|3-105| 78|
//|107|6-166| 79|
//+---+-----+------+
/* 50. 查询Score表中成绩为85，86或88的记录。 */
spark.sql(
"""
|select * from score where Degree in (85,86,88)
""".stripMargin).show()
//+---+-----+------+
//|Sno| Cno|Degree|
//+---+-----+------+
//|103|3-245| 86|
//|105|3-105| 88|
//|101|6-166| 85|
//+---+-----+------+
}
}