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হোম›একাদশ-দ্বাদশ শ্রেণি›English Version›Information and Communication Technology›C-06 — Database Management System›C-06-Q025

C-06-Q025mediumsingle_mcq

When a record's value in the database is unknown, what is used in that place?

aZero (0)
bEmpty string ("")
cNull value
dA space character

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C-06-Q026A user does not want to disclose their monthly family income. According to the chapter, what should be stored
C-06-Q027If a record field is kept blank, how does the database treat it?
C-06-Q028What is a primary key?
C-06-Q029When multiple columns are combined to create a primary key, it is called a —
C-06-Q030Why can a student's name NOT serve as a primary key?
C-06-Q031Which attribute makes an 'id' column automatically increase its value by 1 each time a new row is added?
C-06-Q032Consider the following statements about the student table: Which of the following is correct?
C-06-Q033Why is an 'id' column with auto increment commonly added when no suitable primary key exists?
C-06-Q034According to the chapter, what is true about a primary key in a relational database?
C-06-Q035Why can using class + section + roll number as a composite key cause a problem when keeping records of passed-

C-06 — Database Management System — সব প্রশ্ন দেখুন (143টি) →