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Tim Costello Dimensional Design 101

Tim Costello MCIPT SQL 2005 Administration MCTS SQL 2008 Business Intelligence Tableau Certified Professional Dallas Tableau User Group leader. Business Intelligence Consultant for Interworks Inc.

Inman Corporate Information Factory (CIF) Kimball Data Warehouse (DW) - vs -

Inman Corporate Information Factory (CIF) Kimball Data Warehouse (DW) - vs - 

 Dimensional Bus Things we will cover …

 Dimensional Bus Fact Tables  Things we will cover …

 Dimensional Bus Fact Tables Dimension Tables   Things we will cover …

 Mega Data Warehouse Things we will not cover …

 Mega Data Warehouse OLAP  Things we will not cover …

 Mega Data Warehouse OLAP ETL (Extract Transform Load)   Things we will not cover …

 Mega Data Warehouse OLAP ETL (Extract Transform Load) Presentation Layer    Things we will not cover …

Transactional Database

Dimensional Design

Star Schema

Snowflake Schema

Dimensional Bus

Fact Table

Foreign Keys Measures Degenerate Dimensions Fact Tables Contain * * Sometimes.

3 Kinds Of Fact Table Transactional Fact Table 

3 Kinds Of Fact Table Transactional Fact Table Accumulating Snapshot  

3 Kinds Of Fact Table Transactional Fact Table Periodic Snapshot Accumulating Snapshot   

Transactional Fact Table

Accumulating Snapshot

Periodic Snapshot

Dimension Tables

SELECT DateId, FullDate, NextDayDate, Season, CalendarYear, CalendarYearQuarter, CalendarYearMonth, CalendarYearDayOfYear, CalendarQuarter, CalendarMonth, CalendarDayOfYear, CalendarDayOfMonth …

, CalendarDayOfWeek, CalendarYearName, CalendarYearQuarterName, CalendarYearMonthName, CalendarYearMonthNameLong, CalendarQuarterName, CalendarMonthName, CalendarMonthNameLong, WeekdayName, WeekdayNameLong, CalendarStartOfYearDate, CalendarEndOfYearDate, CalendarStartOfQuarterDate …

, CalendarEndOfQuarterDate, CalendarStartOfMonthDate, CalendarEndOfMonthDate, QuarterSeqNo, MonthSeqNo, FiscalYearName, FiscalYearPeriod, FiscalYearDayOfYear, FiscalYearWeekName, FiscalSemester, FiscalQuarter, FiscalPeriod, FiscalDayOfYear …

, FiscalDayOfPeriod, FiscalWeekName, FiscalStartOfYearDate, FiscalEndOfYearDate, FiscalStartOfPeriodDate, FiscalEndOfPeriodDate, ISODate, ISOYearWeekNo, ISOWeekNo, ISODayOfWeek, ISOYearWeekName, ISOYearWeekDayOfWeekName, DateFormatYYYYMMDD …

, DateFormatYYYYMD, DateFormatMMDDYEAR, DateFormatMDYEAR, DateFormatMMMDYYYY, DateFormatMMMMMMMMMDYYYY, DateFormatMMDDYY, DateFormatMDYY, WorkDay, IsWorkDay from dbo.Dim_Date

Conformed Dimensions

Role Playing Dimensions EmployeeID StartDateKey EndDateKey … DateKey Full_Date NextDayDate Season … dimDatefactEmployeeReview

EmployeeID StartDateKey EndDateKey … StartDateKey Full_Date NextDayDate Season … EndDateKey Full_Date NextDayDate Season … dimStartDate (View based on dimDate) dimEndDate (View based on dimDate) factEmployeeReview

Resources and Links

Kimball Design Tip #18: Taking The Publishing Metaphor Seriously: Kimball Design Tip #46: Another Look At Degenerate Dimension: Design Tip #113 Creating, Using, and Maintaining Junk Dimension: Design Tip #105 Snowflakes, Outriggers, and Bridges: Kimball Design Tip #51: Latest Thinking On Time Dimension Table: Design Tip #69 Identifying Business Processes: Kimball Design Tip #37: Modeling A Pipeline With An Accumulating Snapshot: Kimball Design Tip #16: Hot Swappable Dimension: Kimball Design Tip #21: Declaring The Grain: Fundamental Grains: