MCQ IN COMPUTER SCIENCE & ENGINEERING

Detailed explanation-1: -In a type system, a data type represents a constraint placed upon the interpretation of data, describing representation, interpretation and structure of values or objects stored in computer memory. The type system uses data type information to check correctness of computer programs that access or manipulate the data.

Detailed explanation-2: -Alphanumeric data entry is when a person types data that is made of numbers and letters into a computer. They are typically entering this data into a database or spreadsheets. For example, a secretary may type a person’s address, which includes both numbers and letters, into their database.

Detailed explanation-3: -The CHAR and VARCHAR2 datatypes store alphanumeric data. Character data is stored in strings, with byte values corresponding to the character encoding scheme (generally called a character set or code page).

Detailed explanation-4: -To store text we use a STRING data type. Think of a word or sentence as just a list (string) of characters.