March 6, 2014 at 12:25 pm
Howdy!
I'm building a dw that stores natural disaster data. I'm working on the Inspection piece now and the trouble I'm having is this.
Different kinds of inspections were done on houses, each inspection having its own set of requirements so that not every inspection will look at the same things (i.e. some just look at if the home is occupied, others look at plumbing, electrical, foundation, etc.)
The grain of my fact table should be by the inspection date (it is nearly a factless fact table)
Most of the time people will only want to see there was an inspection done and when it was done.
However, I do need to store the results of the inspections.
I don't know if my current structure is really appropriate considering that other items could come up that need to be added to the inspection requirements.
I welcome all suggestions on improving my current structure (forgive me this is a small sample of my data columns, and I just typed them in short-hand)
I currently have a fact table like this:
FactInspectKey
InspectDateKey
InspectorKey
InspectionTypeKey
DataSourceKey
LoadDateTime
DimDate
DateKey
Month
Year
DimDataSource
DataSourceKey
DataSourceName
DimInspector
InspectorKey
DimInspectionType
InspectionTypeKey
And a "junk dimension" like this with a snow flake schema for comments, condition, and placard (which I don't really like)
DimInspectDetail
InspectDetailKey
NumOfOccupants
SafeToEnterFlag
DemoFlag
ArcheologistFlag
ReinspectionFlag
ViolationFlag
ViolationCommentKey
CommentKey
PercentDamaged
NumOtherStruct
FloorConditionKey
HeatingACConditionKey
GeneralConditionKey
ElectricalConditionKey
WaterDepthInInches
InteriorConditionKey
DimPlacard
PlacardKey
PlacardColor
PlacardDefinition
DimCondition
ConditionKey
Condition
ConditionDefinition
DimComment
CommentKey
Comment
March 21, 2014 at 9:56 am
one option would be to have multiple fact tables. this is demonstrated in the AdventureWorks SSAS walkthrough where there is a fact_internetSales and a fact_ShopSales
March 25, 2014 at 10:20 am
thanks for your reply, that is exactly what I decided to do 🙂
Viewing 3 posts - 1 through 2 (of 2 total)
You must be logged in to reply to this topic. Login to reply