collected in a spreadsheet (an extract from the spreadsheet is shown below). The data has been normalised to first normal form already – underlined column names indicate composite primary key columns. Skill Hairdresser Skill Level Final Name Surname SkilI ID Skill Name Level ID Description Mark ID Joe Mahlasela 1 Styling 1 Basic 75 1 Joe Mahlasela 2 Shampooing 1 Basic 67 1 Joe Mahlasela 3 Cutting 2 Intermediate 98 1 Joe Mahlasela 4 Colouring 2 Intermediate 2 Martha Lebusa 1 Styling 1 Basic 76 2 Martha Lebusa 2 Shampooing 1 Basic 51 2 Martha Lebusa 3 Cutting 2 Intermediate 54 Normalise the above data to third normal form (3NF). Show all steps as well as the final answer in the form of dependency diagrams. HNN

Np Ms Office 365/Excel 2016 I Ntermed
1st Edition
ISBN:9781337508841
Author:Carey
Publisher:Carey
Chapter8: Working With Advanced Functions
Section: Chapter Questions
Problem 2.9CP
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Data about the final marks that hairdressers achieved for the different skill exams has been
collected in a spreadsheet (an extract from the spreadsheet is shown below). The data has been
normalised to first normal form already – underlined column names indicate composite primary
key columns.
Skill
Hairdresser
Skill Level
Final
Name
Surname
Skill ID
Skill Name
Level
ID
Description
Mark
ID
1
Joe
Mahlasela
1
Styling
1
Basic
75
1
Joe
Mahlasela
Shampooing
1
Basic
67
1
Joe
Mahlasela
3
Cutting
2
Intermediate
98
1
Joe
Mahlasela
4
Colouring
Intermediate
2
Martha
Lebusa
Styling
1
Basic
76
Martha
Lebusa
2
Shampooing
1
Basic
51
2
Martha
Lebusa
3
Cutting
2
Intermediate
54
Normalise the above data to third normal form (3NF). Show all steps as well as the final answer in
the form of dependency diagrams.
Transcribed Image Text:Data about the final marks that hairdressers achieved for the different skill exams has been collected in a spreadsheet (an extract from the spreadsheet is shown below). The data has been normalised to first normal form already – underlined column names indicate composite primary key columns. Skill Hairdresser Skill Level Final Name Surname Skill ID Skill Name Level ID Description Mark ID 1 Joe Mahlasela 1 Styling 1 Basic 75 1 Joe Mahlasela Shampooing 1 Basic 67 1 Joe Mahlasela 3 Cutting 2 Intermediate 98 1 Joe Mahlasela 4 Colouring Intermediate 2 Martha Lebusa Styling 1 Basic 76 Martha Lebusa 2 Shampooing 1 Basic 51 2 Martha Lebusa 3 Cutting 2 Intermediate 54 Normalise the above data to third normal form (3NF). Show all steps as well as the final answer in the form of dependency diagrams.
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