Records and fields

Overview

Term field, what happens when one field of a record is updated and record used in a school system.

What you need to know

Answer each one before you reveal it.

Questions from this subtopic

Each one with the model answer underneath.

1. 1

   What is a record?

   Model answer

   A record is a data structure holding related items of different data types under one identifier. Each item within it is called a field.

2. 2

   How does a record differ from an array?

   Model answer

   An array holds items of one data type reached by an index. A record holds fields of different data types reached by name.

3. 3

   Define the term field.

   Model answer

   A field is one named item of data inside a record. Each field has its own data type.

4. 4

   Name four fields you would expect in a record describing a library book.

   Model answer

   A book record would hold an ISBN, a title, an author and a loan status. Each field is given the data type suited to its contents.

5. 5

   Which field of a record singles it out from every other record?

   Model answer

   A key field holds a value that identifies one record uniquely. Two records in the same file never share a key value.

6. 6

   How is a single field of a record referred to in pseudo-code?

   Model answer

   A field is written as book.title, using the record identifier, a dot and the field name. Dot notation reaches one field at a time.

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