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Example 1 – business databaseA business database could be held separately <strong>and</strong> linked to the LLPG suchthat each business holds a single UPRN representing the BLPU within whichit exists. This would be preferable to holding business names as SAONs,which would complicate the LLPG <strong>and</strong> make it very difficult to maintain. Herethere would typically be a one to many link between the LLPG <strong>and</strong> theBusiness Database (one UPRN could have many businesses against it).One to ManyBLPUBusiness RecordBusiness RecordBusiness RecordBusiness RecordBusiness RecordExample 2 – housing database3.6.4 A database of housing estates <strong>and</strong> blocks (for service charge allocatio<strong>net</strong>c) could also be held as a separate database. This would bepreferable to holding entire housing estates as BLPUs within the LLPGpurely for attaching data against them. Here there would be a many toone relationship between the LLPG <strong>and</strong> the Housing database whereMany UPRNS would be referenced by a Single housing estate or blockrecord.Many to OneBLPUBLPUBLPUBLPUBLPUHousing BlockVersion : 4Date: 18/02/05 Page 20