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CHAPTER 2 s DEFINE YOUR DATA
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Table 2-6. Addresses Data Table
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Addresses_PK
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Address_Cities_FK
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Street_Address
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123 Main Street Northwest 234 Second Street Northwest
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Table 2-7. Address_Cities Data Table
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Mountain City
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State
Idaho
Postal_Code
Table 2-8. Years_Built Data Table
Years_Built_PK
Addresses_FK
Year_Built
2002 2003
Table 2-9. Owners Data Table
Owners_PK
6 7 8 9
Addresses_FK
1 1 2 2
Name
John Doe Jane Doe John Q. Public David Doe
Table 2-10. Assessments Data Table
Assessments_PK
10 11 12 13 14 15 16 17 18
Addresses_FK
1 1 1 1 1 2 2 2 2
Year_Assessed
2002 2003 2004 2005 2006 2003 2004 2005 2006
Assessed_Value
$225,000 $230,000 $235,000 $237,000 $240,000 $275,000 $285,000 $299,000 $302,000
CHAPTER 2 s DEFINE YOUR DATA
Table 2-11. Parcels Data Table
Parcels_PK
19 20
Addresses_FK
Parcel_Volumes_FK
21 21
921 919
Plat
47 34
Parcel
E2 E1
Year_Recorded
2002 2003
Page
114 382
Table 2-12. Parcel_Volumes Data Table
Parcel_Volumes_PK
Volume
Springsville County Public Records
Step 6: Examine your database design to see if you can use the data table relationships, primary keys, and foreign keys to assemble a complete representative set of data records with no duplicated data. Using the preceding data tables, here s the data you could gather for the property at 234 Second Street Northwest: Property address: 234 Second Street Northwest; Mountain City, Idaho 88812 Year house built: 2003 Property owners: John Q. Public and David Doe Assessed property values: $275,000 in 2003; $285,000 in 2004; $299,000 in 2005; $302,000 in 2006 Property parcel number: Lot 919, plat 34, parcel E1, as recorded in the year 2003 on page 382 of Springsville County Public Records Step 7: Confirm that if you need to change any of the records volatile facts, you should only make changes in one record in one table, or add one record to a limited number of tables: If the government or the postal system needs to change a property address or the postal code you would only need to change one record in the Addresses data table or one record in the Address_Cities data table. If the city government needs to redraw city boundaries so that a property is now considered in a different city, or if the city government changes the city s name altogether, you would only need to change one record in the Addresses table and one record in the Address_Cities table. If a house on a property is to be torn down and rebuilt in 2007, you would only need to add one record in the Years_Built table. If property owners names need to be changed, you would only need to add, remove, or change records in the Owners table. When a property is reassessed in 2007, you would only need to add one record to the Assessments table.
CHAPTER 2 s DEFINE YOUR DATA
If the local government needs to change a property parcel number, you would only need to change one record in the Parcels table. If the county government needs to redraw county boundaries so that a property is now considered in a different county, or if the county government changes the county s name altogether, you would only need to change one record in the Parcel_Volumes table. To design a multidimensional database s structure, do the following: Step 1: Identify the multidimensional database s dimensions, which are categories or groupings of similar facts and figures. In the preceding example, assuming you have a database full of tens of thousands or more property listings, you could create the following dimensions: Geographic Location Time Assessed Value Parcel Location Step 2: Identify the multidimensional database s levels, which are further groupings of data in each dimension. For the Geographic Location dimension, you could create the following levels: City County State Postal Code For the Time dimension, you could create a Year level. For the Assessed Value dimension, you could create a Value Point level. For the Parcel Location dimension, you could create the following levels: Lot Plat Step 3: Identify the multidimensional database s members, which are groupings of data in each level. For the Geographic Location dimension, you could create the following members: Mountain City (for the City level) Springsville County (for the County level) Idaho (for the State level) 88812 (for the Postal Code level)
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