← VCE Data Analysis

Annotated diagram of a database or spreadsheet

A diagram of a database or spreadsheet with labels and notes on its parts, such as tables, fields, data types, cells, formulas and validation, explaining what each part does.

Part of: VCE Applied Computing - U1O1 - Data analysis — Module 74, VCE Data Analytics - U3O1 - Data Analytics — Module 36

Understanding Annotated diagram of a database or spreadsheet in VCE Data Analysis

What it does: This note describes a validation rule on the Age field, telling the reader what input is allowed. The note names the field, gives its data type and explains its purpose, which is the purpose of labelling fields on an annotated diagram. A good annotation explains the function of the part. Noting the formula and its purpose helps others understand the design. Annotated diagrams label the individual parts, such as tables, fields, cells and formulas, not just the file name. Noting formulas on a spreadsheet diagram explains how each calculated cell gets its result.

Common mistakes: The note says Age is a whole number, so the field data type should be Integer, not Text. The annotation says D2 is price x quantity, so the formula must multiply: =B2*C2, not add.

Class: _____________________  ·  Name: _____________________  ·  Date: _________

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This module's key terms are also in a printable crossword (Modules 68–80) and word search (Modules 56–80).

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Learning
Duo
What makes a diagram of a spreadsheet an annotated diagram?
It only shows the spreadsheet with no extra writingIt has labels and notes explaining what each part does
Matches
Field: Quantity (Text) - number of items ordered
↓
The data type is wrong. Quantity is a count used in calculations, so it should be labelled Integer, not Text.
Applying
Meanings
Term
annotated diagram
Meaning
A diagram of a database or spreadsheet with labels and notes on its parts, such as tables, fields, data types, cells, formulas and validation, explaining what each part does.
Practice
Table: Students
Testing
Gaps
Data type:
Check Answer
Spots
1Table: Students
2Field: Age (Text)

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Quick Questions

1. What makes a diagram of a spreadsheet an annotated diagram?
A. It has labels and notes explaining what each part does ✓
B. It only shows the spreadsheet with no extra writing
An annotated diagram adds labels and notes to explain the function of each part, such as cells, fields and formulas.
2. A student draws a database table and labels one field 'StudentID - Integer'. What is this annotation showing?
A. The field name and its data type ✓
B. The formula used to calculate the field
Labelling fields and data types tells the reader what each field stores and what kind of data it holds.
3. Which note would best annotate cell D2 in a spreadsheet?
A. Formula =B2*C2 calculates the total cost ✓
B. This is a nice-looking cell
A good annotation explains the function of the part. Noting the formula and its purpose helps others understand the design.
4. Which parts of a database or spreadsheet can be labelled in an annotated diagram?
A. Only the title of the file
B. Tables, fields, cells and formulas ✓
Annotated diagrams label the individual parts, such as tables, fields, cells and formulas, not just the file name.
5. A field called Age should only accept whole numbers from 0 to 120. Which annotation fits best?
A. Formula: =SUM(Age)
B. Validation: range check, integer between 0 and 120 ✓
Notes on validation describe the rule that restricts what can be entered in a field, such as a range check.

Match the Pairs

Field: DateJoined (Date/time) → An annotation that labels a field and states its data type, so readers know it stores dates and times
Note: D2 = B2*C2 → An annotation that records the formula in a cell, showing how the value is calculated from other cells
An annotation on a validation rule explains which values a field will accept → Validation: Age must be a whole number from 12 to 18
An annotation identifies a field and says what data it holds and what type it is → Field: Price (Floating point) - cost of one item in dollars
Field: Quantity (Text) - number of items ordered → The data type is wrong. Quantity is a count used in calculations, so it should be labelled Integer, not Text.
Cell D2: Total cost of the order → The note does not record the formula. It should show how the value is calculated, such as D2 = B2*C2.

Key Term

annotated diagram
A diagram of a database or spreadsheet with labels and notes on its parts, such as tables, fields, data types, cells, formulas and validation, explaining what each part does.

Fill in the Blanks

1. Field: DateOfBirth Data type: Date/time
Hint: Type the data type that suits a birth date field.
2. Cell D2 note: =SUM(B2:C2) adds the marks
Hint: Type the function name that adds a range of cells.
3. Validation: Range check keeps Mark 0 to 100
Hint: Type the kind of validation check that limits a value between a minimum and maximum.
4. Label: StudentID = primary key (unique)
Hint: Type the word for the field that uniquely identifies each record in a table.
5. F2: =IF(E2>=50,"Pass","Fail") Note: tests if the mark reaches 50
Hint: Type the function that chooses between two results based on a condition.

Spot the Error

Question 1
A Table: Students
B Field: Age (Text)
C Note: whole number, 12 to 19
Line B — The note says Age is a whole number, so the field data type should be Integer, not Text.
Question 2
A Cell B2: Price (dollars)
B Cell C2: Quantity (Integer)
C Cell D2: Total (price x qty)
D Formula D2: =B2+C2
Line D — The annotation says D2 is price x quantity, so the formula must multiply: =B2*C2, not add.
Question 3
A Field: Quantity (Integer)
B Validation: range 1 to 1000
C Note: rejects 0 and 101
Line B — The note says 101 is rejected, so the validation range must end at 100, not 1000.
Question 4
A Cell: Orders
B Field: OrderDate (Date/Time)
C Note: stores the date ordered
Line A — Orders is the label for the whole table that holds the fields, so it should say Table: Orders, not Cell.
Question 5
A Cell A1: Student name
B Cell B1: Test 1 mark
C Cell C1: Test 2 mark
D Formula D1: =SUM(B1:C1)
E Note: D1 is the mean of B1:C1
Line D — The note says D1 is the mean of the marks, so the formula should be =AVERAGE(B1:C1), not SUM.

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