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Normalize this table to the third normal formLoanIDMemberNameMemberIDBook1DueDate1Book2DueDate2Book3DueDate39001Sarah Adams101Introduction to SQL2024-08-10Python Programming2024-08-15--9002Mark Taylor102Data Structures2024-09-05Algorithms2024-09-10SQL Fundamentals2024-09-159003Jessica Lee103JavaScript Basics2024-10-20----View keyboard shortcutsEditViewInsertFormatToolsTable

Question

Normalize this table to the third normal formLoanIDMemberNameMemberIDBook1DueDate1Book2DueDate2Book3DueDate39001Sarah Adams101Introduction to SQL2024-08-10Python Programming2024-08-15--9002Mark Taylor102Data Structures2024-09-05Algorithms2024-09-10SQL Fundamentals2024-09-159003Jessica Lee103JavaScript Basics2024-10-20----View keyboard shortcutsEditViewInsertFormatToolsTable

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Solution

To normalize the given table to the third normal form (3NF), we need to eliminate any transitive dependency by making sure that non-prime attributes (attributes that are not part of any candidate key) are dependent on the primary key only.

Here are the steps:

  1. Identify the primary key: In this case, the primary key is LoanID.

  2. First Normal Form (1NF): A table is in 1NF if it has an atomic value for each attribute in a row. The given table is not in 1NF because the attributes Book1, DueDate1, Book2, DueDate2, Book3, DueDate3 are repeating. We need to remove repeating groups by creating a new table for each set of related data.

    We can create a new table LoanDetails with the columns LoanID, Book, and DueDate.

    LoanDetails:

    LoanID Book DueDate
    9001 Introduction to SQL 2024-08-10
    9001 Python Programming 2024-08-15
    9002 Data Structures 2024-09-05
    9002 Algorithms 2024-09-10
    9002 SQL Fundamentals 2024-09-15
    9003 JavaScript Basics 2024-10-20

    And the original table becomes:

    LoanID MemberName MemberID
    9001 Sarah Adams 101
    9002 Mark Taylor 102
    9003 Jessica Lee 103

  3. Second Normal Form (2NF): A table is in 2NF if it is in 1NF and every non-prime attribute is fully functionally dependent on the primary key. In this case, both tables are in 2NF because MemberName is fully dependent on MemberID in the first table and Book and DueDate are fully dependent on LoanID in the second table.

  4. Third Normal Form (3NF): A table is in 3NF if it is in 2NF and there is no transitive dependency for non-prime attributes. In this case, both tables are in 3NF because there is no transitive dependency.

So, the tables in 3NF are:

Loans:

LoanID MemberName MemberID
9001 Sarah Adams 101
9002 Mark Taylor 102
9003 Jessica Lee 103

LoanDetails:

LoanID Book DueDate
9001 Introduction to SQL 2024-08-10
9001 Python Programming 2024-08-15
9002 Data Structures 2024-09-05
9002 Algorithms 2024-09-10
9002 SQL Fundamentals 2024-09-15
9003 JavaScript Basics 2024-10-20

This problem has been solved

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