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Conversion of the Generalization Hierarchy in Figure 629 (SQL:2003 Syntax)
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CREATE TABLE Security ( Symbol CHAR(6), SecName VARCHAR(30), LastClose DECIMAL(10,2), CONSTRAINT PKSecurity PRIMARY KEY (Symbol)
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CREATE TABLE Stock ( Symbol CHAR(6), OutShares INTEGER, IssuedShares INTEGER, CONSTRAINT PKStock PRIMARY KEY (Symbol), CONSTRAINT FKStock FOREIGN KEY (Symbol) REFERENCES Security ON DELETE CASCADE ) CREATE TABLE Bond ( Symbol CHAR(6), Rate DECIMAL(12,4), FaceValue DECIMAL(10,2), CONSTRAINT PKBond PRIMARY KEY (Symbol), CONSTRAINT FKBond FOREIGN KEY (Symbol) REFERENCES Security ON DELETE CASCADE ) CREATE TABLE Common ( Symbol PERatio Dividend CONSTRAINT PKCommon CONSTRAINT FKCommon CASCADE
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CHAR(6), DECIMAL(12,4), DECIMAL(10,2), PRIMARY KEY (Symbol), FOREIGN KEY (Symbol) REFERENCES Stock ON DELETE )
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CREATE TABLE Preferred ( Symbol CHAR(6), CallPrice DECIMAL(12,2), Arrears DECIMAL(10,2), CONSTRAINT PKPreferred PRIMARY KEY (Symbol), CONSTRAINT FKPreferred FOREIGN KEY (Symbol) REFERENCES Stock ON DELETE CASCADE )
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FIGURE 631 1-1 Relationship
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11 ir
Office Manages OtOfficeNo OffAddress OffPhone
6
Developing Data Models for Business Databases
FIGURE 632
Conversion of the 1-1 Relationship in Figure 631 (SQL:2003 Syntax)
CREATE TABLE Employee ( EmpNo INTEGER, EmpName VARCHAR(30), CONSTRAINT PKEmployee PRIMARY KEY (EmpNo)
CREATE TABLE Office ( OfficeNo INTEGER, Off Address VARCHAR(30), OffPhone CHAR(10), EmpNo INTEGER, CONSTRAINT PKOffice PRIMARY KEY (OfficeNo), CONSTRAINT FKEmpNo FOREIGN KEY (EmpNo) REFERENCES Employee, CONSTRAINT EmpNoUnique UNIQUE (EmpNo) )
FIGURE 633 Water Utility ERD with a Generalization Hierarchy
Commercial TaxPayerlD EnterpriseZone
Residential Subsidized DwellingType
RateSet RateSetNo RSApprDate RSEffDate Assigned Customer CustNo C X J CustName CustType Uses
Contains
ReadBy
Rate MinUsage MaxUsage FixedAmt fO Includes
Reading ReadNo I<] ReadTime ReadLevel
Employee EmpNo EmpName EmpTitle Performs
Comprehensive Conversion Example
This section presents a larger example to integrate your knowledge o f the conversion rules Figure 633 shows an E R D similar to the final E R D for the water utility problem discussed in Section 61 For brevity, some attributes have been omitted Figure 634 shows the rela tional tables derived through the conversion rules Table 65 lists the conversion rules used along with brief explanations
Part Three
Data Modeling Conversion of the ERD in Figure 633 (SQL:2003 Syntax)
FIGURE 6 3 4
CREATE TABLE Customer ( CustNo INTEGER, CustName VARCHAR(30), CustType CHAR(6), RateSetNo INTEGER NOT NULL, CONSTRAINT PKCustomer PRIMARY KEY (CustNo), CONSTRAINT FKRateSetNo FOREIGN KEY (RateSetNo) REFERENCES RateSet CREATE TABLE Commercial ( CustNo INTEGER, TaxPayerlD CHAR(20) NOT NULL, EnterpiseZone BOOLEAN, CONSTRAINT PKCommercial PRIMARY KEY (CustNo), CONSTRAINT FKCommercial FOREIGN KEY (CustNo) REFERENCES Customer ON DELETE CASCADE ) CREATE TABLE Residential ( CustNo INTEGER, Subsidized BOOLEAN, DwellingType CHAR(6), CONSTRAINT P r e s i d e n t i a l PRIMARY KEY (CustNo), CONSTRAINT FKResidential FOREIGN KEY (CustNo) REFERENCES Customer ON DELETE CASCADE ) CREATE TABLE RateSet ( RateSetNo INTEGER, RSApprDate DATE, RSEtfDate DATE, CONSTRAINT PKRateSet PRIMARY KEY (RateSetNo)
CREATE TABLE Rate ( RateSetNo INTEGER, MinUsage INTEGER, MaxUsage INTEGER, FixedAmt DECIMAL(10,2), CONSTRAINT PKRate PRIMARY KEY (RateSetNo, MinUsage), CONSTRAINT FKRateSetNo2 FOREIGN KEY(RateSetNo) REFERENCES RateSet CREATE TABLE Meter ( MeterNo INTEGER, MtrSize INTEGER, MtrModel CHAR(6), CustNo INTEGER NOT NULL, CONSTRAINT PKMeter PRIMARY KEY (MeterNo), CONSTRAINT FKCustNo FOREIGN KEY (CustNo) REFERENCES Customer
6 Developing Data Models for Business Databases 195
FIGURE 6 3 4
(Continued)
CREATE TABLE Reading ( ReadNo ReadTime ReadLevel MeterNo EmpNo BilINo INTEGER, TIMESTAMP, INTEGER, INTEGER INTEGER INTEGER, NOT NULL, NOT NULL,
CONSTRAINT PKReading PRIMARY KEY (ReadNo), CONSTRAINT FKEmpNo FOREIGN KEY (EmpNo) REFERENCES Employee, CONSTRAINT FKMeterNo FOREIGN KEY (MeterNo) REFERENCES Meter, CONSTRAINT FKBilINo FOREIGN KEY (BilINo) REFERENCES Bill CREATE TABLE Bill ( BilINo BillDate BillStartDate INTEGER, DATE, DATE, ) )
CONSTRAINT PKBill PRIMARY KEY (BilINo) CREATE TABLE Employee ( EmpNo EmpName EmpTitle INTEGER, VARCHAR(50), VARCHAR(20),
CONSTRAINT PKEmployee PRIMARY KEY (EmpNo)
TABLE 65 Conversion Rules Used for Figure 633
Rule
, How Used
3 4 5 6
All entity types except subtypes converted to tables with primary keys 1-M relationships converted to foreign keys: Contains relationship to RateRateSetNo; Uses relationship to MeterCustNo; ReadBy relationship to ReadingMeterNo; Includes relationship to ReadingBilINo; Performs relationship to ReadingEmpNo; Assigned relationship to Customer RateSetNo Not used because there are no M-N relationships Primary key of Rate table is a combination of RateSetNo and MinUsage Not used although it could have been used for the Includes relationship Subtypes (Commercial and Residential) converted to tables Primary key of Customer is added to the Commercial and Residential tables Foreign key constraints with CASCADE DELETE options added to tables corresponding to the subtypes
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