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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,coursesandscores.coursesconsists 3 columns,sid,student_id, andcourse_id.scoresconsists 2 columns,sidandscore. 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 incoursesandscores.

Followed m lines are records ofcourses.student_idare 8-digits numbers begin with non-zero digit.sidandscoresare positive integers smaller than 1000.

Followed n lines are records ofscores.sidare positive integers smaller than 1000.scoreare 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

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