The question is in the image attached Data about the final marks that hairdressers achieved for the different skill exams has beencollected in a spreadsheet (an extract from the spreadsheet is shown below). The data has beennormalised to first normal form already – underlined column names indicate composite primarykey columns.SkillHairdresserSkill LevelFinalNameSurnameSkill IDSkill NameLevelIDDescriptionMarkID1JoeMahlasela1Styling1Basic751JoeMahlaselaShampooing1Basic671JoeMahlasela3Cutting2Intermediate981JoeMahlasela4ColouringIntermediate2MarthaLebusaStyling1Basic76MarthaLebusa2Shampooing1Basic512MarthaLebusa3Cutting2Intermediate54Normalise the above data to third normal form (3NF). Show all steps as well as the final answer inthe form of dependency diagrams.

Primary key for the relation = {Hairdresser ID, SkillID} The FDs on the relation are Hairdresser ID…

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

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

MIS

9th Edition

ISBN:9781337681919

Author:BIDGOLI

Publisher:BIDGOLI

Chapter3: Database Systems, Data Warehouses, And Data Marts

Section: Chapter Questions

Problem 6P

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Given the following query SELECT StudID, CourseTitle, CreditsFROM Enrollment, CourseWHERE Enrollment.CourseTitle = Course.CourseTitle ANDEnrollment.Decision = TRUE and Course.Credits > 4which of the following indexes could NOT be useful inspeeding-up the query? a) tree-based index on Enrollment.CourseTitleb) hash-based index on Enrollment.Decisionc) hash-based index on Course.CourseTitled) hash-based index on Course.Credits Can someone explain me step by step which is the correct answer and why,please?
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