
CSDL
Quiz
•
English
•
6th Grade
•
Practice Problem
•
Medium
Lã Phan Anh Anh
Used 2+ times
FREE Resource
Enhance your content in a minute
94 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
XY→WP chứa thuộc tính P dư thừa?
2.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
Tìm chuỗi suy diễn AB→E với tập phụ thuộc hàm: F={AB→C,B→D,CD→E,CE→GH,G→A}?
3.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
Với tập phụ thuộc hàm F={X→Z,XY→WP,XY→ZWQ,XZ→R}, WP có thuộc tính dư thừa nào?
4.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
(AG)+ với F={A→BC,I→K,GB→H,CG→I,B→H}: Tập bao đóng là gì?
5.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
Quan hệ R(A,B,C,D) với F={A→B,B→C,AC→D}: Tất cả khóa ứng viên là?
6.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
Mô hình cơ sở dữ liệu nào được sử dụng phổ biến nhất?
7.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
Câu lệnh UPDATE trong SQL dùng để làm gì?
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