← VCE Data Analytics U3O2

Records: grouping fields of different data types

A structure that groups related fields of different data types to describe one thing, such as a student's name (text), age (integer) and mark (decimal).

Part of: VCE Data Analytics - U3O2 - Analysis and Design — Module 53, VCE Applied Computing U1O2 Programming: Data structures — Module 5, QCE Digital Solutions Unit 2 — Data-Driven Problems and Solution Requirements — Module 14, QCE Digital Solutions Unit 2 — Data and Programming Techniques — Module 25, QCE Digital Solutions Unit 4 — Digital Methods for Exchanging Data — Module 120, WA Computer Science ATAR Year 11 — Data Management — Module 10

Understanding Records: grouping fields of different data types in VCE Data Analytics U3O2

What it does: Each student gets their own record with the same fields, showing one record per item. The array stores only integer marks, while the record mixes text (name) and a number (mark) to describe one thing. A field name labels the piece of data (studentName). "Ava Nguyen" is the value stored in that field. Fields in a record can differ in type. This is a key difference between records and arrays. Defining a record means naming every field and giving its data type, such as String, Integer or Float.

Common mistakes: Each field in a record must be declared as fieldName AS Type. The AS keyword is missing, so the line should be ' age AS Integer'. A book title is text, so the field should have the data type String, not Integer. The line should be ' title AS String'. Records can mix data types.

Class: _____________________ · Name: _____________________ · Date: _________

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This module's key terms are also in a printable crossword (Modules 32–75) and word search (Modules 3–146).

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Learning

Duo

Which best describes a record?

Groups related fields, which can be different data types, to describe one thingStores many values that must all be the same data type

Matches

student = {"name": "Noah", "age": "sixteen"} student["age"] + 1

↓

The age field holds text instead of an integer, so maths on it fails. Store it as the integer 16.

Applying

Meanings

Term

record

Meaning

A structure that groups related fields of different data types to describe one thing, such as a student's name (text), age (integer) and mark (decimal).

Practice

RECORD Student

Testing

Gaps

print(["name"])

Check Answer

Spots

2 name AS String

3 age Integer

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Quick Questions

1. Which best describes a record?

A. Stores many values that must all be the same data type

B. Groups related fields, which can be different data types, to describe one thing ✓

A record groups related fields of different types (e.g. text, integer, decimal) about one item. An array holds values of the same type.

2. A student record has the fields name, age and mark. Which set of data types fits?

A. name: String, age: Integer, mark: Float ✓

B. name: Integer, age: String, mark: Boolean

Each field gets the type that suits its data: text for name, a whole number for age and a decimal for mark.

3. How many records would you need to store details of 30 students?

A. 1 record that holds all 30 students at once

B. 30 records, one per student ✓

One record describes one item. For 30 students you create one record for each student.

4. Which is a field name in a Student record?

A. studentName ✓

B. "Ava Nguyen"

A field name labels the piece of data (studentName). "Ava Nguyen" is the value stored in that field.

5. Record or array: you want to store a student's name, age and mark together.

A. Record ✓

B. Array

The data is about one thing and mixes data types (text, integer, decimal), so a record is the best fit.

Match the Pairs

student = {"name": "Ava", "age": 15, "mark": 88.5} → A record for one student that groups a text field, an integer field and a decimal field

Record Student: name String, age Integer, mark Float → A record definition that lists each field name and its data type

A record holds one item, so you need one record per student → student1 = {"name": "Ava", "age": 15} student2 = {"name": "Liam", "age": 16}

An array holds values of the same type, but a record can mix data types → marks = [88, 74, 91] student = {"name": "Mia", "mark": 91}

student = {"name": "Noah", "age": "sixteen"} student["age"] + 1 → The age field holds text instead of an integer, so maths on it fails. Store it as the integer 16.

students = {"name": "Zoe", "name": "Leo", "age": 15} → Two students are crammed into one record by repeating a field. Each student needs their own record.

Key Term

record

A structure that groups related fields of different data types to describe one thing, such as a student's name (text), age (integer) and mark (decimal).

Fill in the Blanks

1. student = {"name": "Ava", "age": 15} print(student["name"])

Hint: Type the variable name that holds the record, so you can read its name field

2. student = {"name": "Ava", "mark": 87.5} print(type(student["mark"]))

Hint: Type the built-in function that reports the data type of a value

3. roster = [{"name": "Zoe"}, {"name": "Leo"}] print(roster[1]["name"])

Hint: Type the index of the second record in the list, remembering that indexes start at zero

4. student = {"name": "Ava", "age": 15} print(len(student))

Hint: Type the built-in function that counts how many fields the record holds

5. student = {"name": "Ava", "age": 15} for field in student: print(field)

Hint: Type the keyword that starts a loop through every field name in the record

Spot the Error

Question 1

A RECORD Student

B name AS String

C age Integer

D mark AS Decimal

E END RECORD

Line C — Each field in a record must be declared as fieldName AS Type. The AS keyword is missing, so the line should be ' age AS Integer'.

Question 2

A RECORD Book

B title AS Integer

C pages AS Integer

D END RECORD

Line B — A book title is text, so the field should have the data type String, not Integer. The line should be ' title AS String'. Records can mix data types.

Question 3

A DIM s AS Student

B s.name = "Ava"

C s.age = "16"

D s.mark = 88.5

Line C — The age field is an Integer, so it must be given a whole number, not text in quotes. The line should be 's.age = 16'.

Question 4

A ARRAY Pet

B name AS String

C age AS Integer

D END RECORD

Line A — An array holds items of the same data type, but this structure has a String and an Integer field. A record groups different types, so the line should be 'RECORD Pet'.

Question 5

A DIM s AS Student

B s.name = Noah

C s.mark = 72.5

Line B — A String value must be written inside quotes. Without them, Noah looks like a variable name. The line should be 's.name = "Noah"'.

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