1. Date Dimension: Past & Future in One Script Steve Wake, BI Developer, Chipotle

2. 2 Please silence cell phones 2

3. Agenda What & Why of Date/Time Dimensions Date/Time Dimension Benefits What to Include in Date Dimension What to Include in Time Dimension Date/Time Dimension Scripts Demo 3

4. What is a Date Dimension? Dimension to track dates by day Can track multiple calendars Gregorian, Julian, Fiscal… Time in separate dimension (if needed) One row per date/day 4

5. What is a Time Dimension? Dimension to track time Hours, Minutes, Seconds… Keep time zones in mind (standardize or UTC?) Separate from Date Dimension for flexibility Only needs to cover 24 hours 5

6. Why Date/Time Dimensions? Most reporting is done by date/time Track Holidays and other significant dates Do date calculations in SQL once Date/Time period comparisons Generate for years/decades easily 6

7. Date/Time Dimension Types Calculated (Dynamic SQL, DAX) – Slow Tool Created (Excel, Power BI) – Tool Dependent Custom Physical (copy/paste) – Hard to Update Hybrid – Most Flexible, Custom Dev Time Steve’s Script – Flexible, Fast & Easy to Update 7

8. What to Include in dimDate? Date as Integer for PK to make reload not break links (20130806) Date in multiple formats (“08/06/2013”, “Tuesday, August 6, 2013”…) Multiple parts (Month, Day, Year, Month Text, Day Text…) Holiday indicator (domestic, international, religious…) Gregorian, Julian, and Fiscal Calendars Calculated measures (Day # in week, Day # in month, Day # in year, Week # in month, Week # in year…) 8

9. What to Include in dimTime? Time as Integer for PK to make reload not break links (130101) Time in multiple formats (“01:01 PM”, “13:01”…) Multiple parts (Hour, Minute, Second…) AM/PM indicators Daylight Saving Indicator? Time Zones? (GMT/UTC?) 9

10. Demo dimDate Script dimTime Script

11. 11 Session Evaluations ways to access Go to passSummit.comDownload the GuideBook App and search: PASS Summit 2015 Follow the QR code link displayed on session signage throughout the conference venue and in the program guide Submit by 5pm Friday November 6 th to WIN prizes Your feedback is important and valuable. 11

12. Contact swake@chipotle.com @stevewake @stevewake on Twitter LinkedInLinkedIn, Google+Google+ Blog – http://wakebi.comhttp://wakebi.com

13. Thank You