free barcode for excel 2007 The loan table in Software

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The loan table
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Silberschatz Korth Sudarshan: Database System Concepts, Fourth Edition
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I Data Models
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2 Entity Relationship Model
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The McGraw Hill Companies, 2001
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Entity-Relationship Model
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customer-id 019-28-3746 182-73-6091 192-83-7465 244-66-8800 321-12-3123 335-57-7991 336-66-9999 677-89-9011 963-96-3963
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customer-name Smith Turner Johnson Curry Jones Adams Lindsay Hayes Williams Figure 224
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customer-street North Putnam Alma North Main Spring Park Main Nassau The customer table
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customer-city Rye Stamford Palo Alto Rye Harrison Pittsfield Pittsfield Harrison Princeton
As another example, consider the entity set customer of the E-R diagram in Figure 28 This entity set has the attributes customer-id, customer-name, customer-street, and customer-city The table corresponding to customer has four columns, as in Figure 224
292 Tabular Representation of Weak Entity Sets
Let A be a weak entity set with attributes a1 , a2 , , am Let B be the strong entity set on which A depends Let the primary key of B consist of attributes b1 , b2 , , bn We represent the entity set A by a table called A with one column for each attribute of the set: {a1 , a2 , , am } {b1 , b2 , , bn } As an illustration, consider the entity set payment in the E-R diagram of Figure 216 This entity set has three attributes: payment-number, payment-date, and payment-amount The primary key of the loan entity set, on which payment depends, is loan-number Thus, we represent payment by a table with four columns labeled loan-number, paymentnumber, payment-date, and payment-amount, as in Figure 225
293 Tabular Representation of Relationship Sets
Let R be a relationship set, let a1 , a2 , , am be the set of attributes formed by the union of the primary keys of each of the entity sets participating in R, and let the descriptive attributes (if any) of R be b1 , b2 , , bn We represent this relationship set by a table called R with one column for each attribute of the set: {a1 , a2 , , am } {b1 , b2 , , bn } As an illustration, consider the relationship set borrower in the E-R diagram of Figure 28 This relationship set involves the following two entity sets: customer, with the primary key customer-id loan, with the primary key loan-number
Silberschatz Korth Sudarshan: Database System Concepts, Fourth Edition
I Data Models
2 Entity Relationship Model
The McGraw Hill Companies, 2001
Reduction of an E-R Schema to Tables
loan-number L-11 L-14 L-15 L-16 L-17 L-17 L-17 L-23 L-93 L-93
payment-number 53 69 22 58 5 6 7 11 103 104 Figure 225
payment-date 7 June 2001 28 May 2001 23 May 2001 18 June 2001 10 May 2001 7 June 2001 17 June 2001 17 May 2001 3 June 2001 13 June 2001 The payment table
payment-amount 125 500 300 135 50 50 100 75 900 200
Since the relationship set has no attributes, the borrower table has two columns, labeled customer-id and loan-number, as shown in Figure 226
2931 Redundancy of Tables
A relationship set linking a weak entity set to the corresponding strong entity set is treated specially As we noted in Section 26, these relationships are many-to-one and have no descriptive attributes Furthermore, the primary key of a weak entity set includes the primary key of the strong entity set In the E-R diagram of Figure 216, the weak entity set payment is dependent on the strong entity set loan via the relationship set loan-payment The primary key of payment is {loan-number, payment-number}, and the primary key of loan is {loan-number} Since loan-payment has no descriptive attributes, the loan-payment table would have two columns, loan-number and paymentnumber The table for the entity set payment has four columns, loan-number, paymentnumber, payment-date, and payment-amount Every (loan-number, payment-number) combination in loan-payment would also be present in the payment table, and vice versa Thus, the loan-payment table is redundant In general, the table for the relationship set
customer-id 019-28-3746 019-28-3746 244-66-8800 321-12-3123 335-57-7991 555-55-5555 677-89-9011 963-96-3963 Figure 226
loan-number L-11 L-23 L-93 L-17 L-16 L-14 L-15 L-17
The borrower table
Silberschatz Korth Sudarshan: Database System Concepts, Fourth Edition
I Data Models
2 Entity Relationship Model
The McGraw Hill Companies, 2001
2
Entity-Relationship Model
linking a weak entity set to its corresponding strong entity set is redundant and does not need to be present in a tabular representation of an E-R diagram
2932 Combination of Tables
Consider a many-to-one relationship set AB from entity set A to entity set B Using our table-construction scheme outlined previously, we get three tables: A, B, and AB Suppose further that the participation of A in the relationship is total; that is, every entity a in the entity set A must participate in the relationship AB Then we can combine the tables A and AB to form a single table consisting of the union of columns of both tables As an illustration, consider the E-R diagram of Figure 227 The double line in the E-R diagram indicates that the participation of account in the account-branch is total Hence, an account cannot exist without being associated with a particular branch Further, the relationship set account-branch is many to one from account to branch Therefore, we can combine the table for account-branch with the table for account and require only the following two tables: account, with attributes account-number, balance, and branch-name branch, with attributes branch-name, branch-city, and assets
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