Answered: Write in C language Description You…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Write in C language

Description

You have 2 tables, courses and scores. courses consists 3 columns, sid, student_id, and course_id. scores consists 2 columns,sid and score. Please find that how many students failed on at least one course.

Input

First line consists 2 integers m and n, shows number of rows in courses and scores.

Followed m lines are records of courses. student_id are 8-digits numbers begin with non-zero digit. sid and scores are positive integers smaller than 1000.

Followed n lines are records of scores. sid are positive integers smaller than 1000. score are integers in range [0, 100].

Output

Student will be flunked when his/her average score in the course less than 60. Output is 2 integers shows number of student and student failed on at lease one course.

Sample Input 1

2 4

1 10800001 5

2 10800002 5

1 90

1 29

2 65

2 60

Sample Output 1

2 1

Description
You have 2 tables, courses and scores . courses consists 3 columns, sid , student_id , and course_id . scores consists 2 columns, sid and score. Please find that how many students failed on at least one
course
你有2個表單, courses 和scores。
courses 有3個欄位,sid、student_id、course_id。 scores 有2個欄位,sid 和score。請分析有多少學生被當掉至少一科。
Input
First line consists 2 integers m and n, shows number of rows in courses and scores .
Followed m lines are records of courses . student id are 8-digits numbers begin with non-zero digit. sid and scores are positive integers smaller than 1000.
Followed n lines are records of scores . sid are positive integers smaller than 1000. score are integers in range [0, 100].
第一行有2個整數 m 和n,代表courses 和 scores 中有多少行。
接著的 m行是 courses 的内容。 student_id 是個非0開頭的8位數字。sid和 scores 是個未滿 1000的正整數。
接著的n行是scores 的内容。 sid 是個未滿1000的正整數。score 是介於 [0, 100] 間的整數。
Output
Student will be flunked when his/her average score in the course less than 60. Output is 2 integers shows number of student and student failed on at lease one course.
學生若該科的平均分數未滿60 分則他她該科會被當。輸出包含2個整數,分別是學生人數和至少有一科被當的學生人數。
Sample Input 1 É
Sample Output 1
2 4
2 1
1 10800001 5
2 10800002 5
1 90
1 29
2 65
2 60

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