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50 common SQL statements Student (S #, Sname, Sage, Ssex) Student tableCourse (C #, Cname, T #) CurriculumSC (S #, C #, score) Orders tableTeacher (T #, Tname) Instructor table Problem:1. query the student ID of all students whose score is higher than that of the "002" course;Select a. S # from (select s #, score from SC where C # = '001') a, (select s #, scoreF

50 common SQL statementsStudent (S #, Sname, Sage, Ssex) Student tableCourse (C #, Cname, T #) CurriculumSC (S #, C #, score) Orders tableTeacher (T #, Tname) Instructor tableProblem:1. query the student ID of all students whose score is higher than that of the "002" course;Select a. S # from (select s #, score from SC where C # = '001') a, (select s #, scoreFrom SC where C # = '002') BWhere a. score> B. sc

Previously used ArrayList to manage student management system easily. The principle of implementation is basically similar. From keyboard input to the program, read it to assign two variables (name and number), write object (object stream) to file .... The specific implementation is as follows: Package CN. Systemstudent; Import Java.io.File; Import Java.io.FileInputStream; Import java.io.FileNotFoundException; Import Java.io.FileOutputStream; Import

Label:Create DATABASE Shujuku Use Shujuku Use Cangku Go --Note: Foreign key to this relationship is not necessarily a key --2: When you create a foreign key, the primary key for the linked table is established --3: When a foreign key is created, the value of the foreign key must be derived from the primary key value --4: When you want to delete a primary key table, you must first delete the foreign key table information CREATE TABLE student--

50 Common SQL statements Student (s#,sname,sage,ssex) Student table Course (c#,cname,t#) timetable SC (s#,c#,score) score sheet Teacher (t#,tname) Teacher's Table Problem: 1, Query the "001" Course than "002" course scores of all students of the school number; Select a.s# from (select S#,score from SC where c#= ' 001 ') A, (select S#,score From SC where c#= ' 002 ') b where A.score>b.score and a.s#=b.s#;

#创建数据库Create Database Z_stu;#创建表/*Whether the property name data type can be null meaningSno varchar (20) No study number (main code)Sname varchar (20) No student nameSsex varchar (20) No student sexSbirthday Datetime Student Birth dateClass varchar (20) can be student's class*/CREATE table if not EXISTS student (Sno v

Python implements the Student Achievement Management System, python This article provides examples of how to use Python to implement the Student Achievement Management System for your reference. The details are as follows: Basic functions: Enter and store student information: Enter the student's student ID, name, and s

By using ArrayList class and HashMap class and the important methods, the student information is managed to realize the increase, deletion, modification and checking of students ' information. 1. Student Student Information class public class Student { private int stuno;//number private string stuname;//name pri

1. This is a Portal framework class for student information systems. Studentframe is the top-level window frame. Through seven button controls to enter the different classes, different departments of the student information system. Class Studentmanageframe extends JPanel {private static final long serialversionuid = 1L; static final int WIDTH = 400; static final int HEIGHT = 200; JFrame Studentfra

Package Homework08;/* Debug a morning, Harvest: learned the use of yesterday's debugLessons learned: Student stus[]=new student[2];for (int i=0;iStus[i]=new Student (); it should be written out of the loop, otherwise it will be initialized every time.}*/Import Java.util.Scanner;public class Main {public static void Main (String[]args) {/*** 1: Create a simple

Use students--1, queries the sname, Ssex, and class columns of all records in the student table.Select Sname,ssex,class from Student--2, query teachers all units that are not duplicated depart column.Select distinct depart from teacher--3, queries all records of the student table.SELECT * FROM Student--4, queries all r

Python implements the student information management system, python After the Python Implementation of the simple address book in the previous blog, I want to write a complex student information management system. 1. Entry Management of student information;2. Course Selection operations for students;3. query the Course selections of students; The sqlite3 module i

Encapsulate the database to query student information (add, delete, query, and modify) Next to the content of the previous Article (call the method for opening and closing the database) // Query all students+ (NSMutableArray *) getAllStudents;// Query a single student+ (Student *) getStudentWithID :( NSInteger) aID;// Add a s