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This document discusses representing dates and times in a Neo4j graph database to enable querying events that occur on specific dates or within a date range. It shows how dates can be modeled as nodes connected by relationships, and provides Cypher queries to find events on a single day, between two days, or check if an event occurs on a given date. Mixed property and relationship types are also discussed.

Technology

The problem with
perspective is
that it’s
bidirectional

http://xkcd.com/230/

representing dates/times

(using neo4j 1.9.5)

representing dates/times
root (0)
:year_2014

:year_2013
:month_05
Month: 05
:day_24
Day: 24

Year: 2013

:day_25

:day_26

Day: 25

Year: 2014
:month_06

Day: 26
Month: 06

:happens
Event 1

:happens
Event 2

:happens

:happens
Event 3

:month_01
Month 01

find all events on a specific day

START
MATCH

root=node(0)
root-[:year_2013]-()-[:month_05]-()-[:day_24]-()- 
[:happens]-event
RETURN event

find all events for a given range
root (0)
:year_2014

:year_2013
:month_05
Month: 05
:day_24
Day: 24
:happens
Event 1

:next
:happens
Event 2

Year: 2013

:day_25
Day: 25

:day_26
:next

:happens

:month_06

Day: 26
Month: 06
:happens

Event 3

Year: 2014
:month_01
Month 01

find all events for a given range

START root=node(0)
MATCH root-[:year_2013]-()-[:month_05]-()-[:day_24]-start, 
root-[:year_2013]-()-[:month_05]-()-[:day_26]-end, 
start-[:next*0..]-middle-[:next*0..]-end, 
middle-[:happens]-event 
RETURN event

does an event happen on a certain date?

START event=node(20)
MATCH event-[:day_24]-()-[:month_05]-()-[:year_2013]-() 
RETURN event

does an event happen on a certain date?
root (0)
:year_2014

:year_2013
:month_05
Month: 05
:day_24
Day: 24

Year: 2013

:day_25

:day_26

Day: 25

Year: 2014
:month_06

Day: 26
Month: 06

:happens
Event 1 (20)

:happens
Event 2

:happens

:happens
Event 3

:month_01
Month 01

property vs. relationship type

constructing cypher queries

execution plan cache vs.
property load

creating and deleting calendar
graph

$mixed property/relationship type START MATCH root=node(0) root-[:year_2013]-()-[:month_05]-()-[:day_24]-()-  [:hour] - (hour_node) - [:happens]-event WHERE hour_node.hour = {hour} RETURN event$

$calendar creation START ref_node = node(0) CREATE UNIQUE ref_node - [:year_2013] -> [:month_11] -> [:day_27] -> [:hour] -> RETURN hour_node (year_node (month_node (day_node (hour_node {year: {month: {day: {hour: {year}}) {month}}) {day}}) {hour}}) - -$

deleting calendar
root (0)
:year_2014

:year_2013
:month_05
Month: 05
:day_24
Day: 24

Year: 2013

:day_25

:day_26

Day: 25

Year: 2014
:month_06

Day: 26
Month: 06

:happens
Event 1

:happens
Event 2

:happens

:happens
Event 3

:month_01
Month 01

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Graph cafe-lightning

4. The problem with perspective is that it’s bidirectional http://xkcd.com/230/

5. representing dates/times (using neo4j 1.9.5)

6. representing dates/times root (0) :year_2014 :year_2013 :month_05 Month: 05 :day_24 Day: 24 Year: 2013 :day_25 :day_26 Day: 25 Year: 2014 :month_06 Day: 26 Month: 06 :happens Event 1 :happens Event 2 :happens :happens Event 3 :month_01 Month 01

7. find all events on a specific day START MATCH root=node(0) root-[:year_2013]-()-[:month_05]-()-[:day_24]-()-  [:happens]-event RETURN event

8. representing dates/times root (0) :year_2014 :year_2013 :month_05 Month: 05 :day_24 Day: 24 Year: 2013 :day_25 :day_26 Day: 25 Year: 2014 :month_06 Day: 26 Month: 06 :happens Event 1 :happens Event 2 :happens :happens Event 3 :month_01 Month 01

9. find all events for a given range root (0) :year_2014 :year_2013 :month_05 Month: 05 :day_24 Day: 24 :happens Event 1 :next :happens Event 2 Year: 2013 :day_25 Day: 25 :day_26 :next :happens :month_06 Day: 26 Month: 06 :happens Event 3 Year: 2014 :month_01 Month 01

10. find all events for a given range START root=node(0) MATCH root-[:year_2013]-()-[:month_05]-()-[:day_24]-start,  root-[:year_2013]-()-[:month_05]-()-[:day_26]-end,  start-[:next*0..]-middle-[:next*0..]-end,  middle-[:happens]-event  RETURN event

11. find all events for a given range root (0) :year_2014 :year_2013 :month_05 Month: 05 :day_24 Day: 24 :happens Event 1 :next :happens Event 2 Year: 2013 :day_25 Day: 25 :day_26 :next :happens :month_06 Day: 26 Month: 06 :happens Event 3 Year: 2014 :month_01 Month 01

12. find all events for a given range root (0) :year_2014 :year_2013 :month_05 Month: 05 :day_24 Day: 24 :happens Event 1 :next :happens Event 2 Year: 2013 :day_25 Day: 25 :day_26 :next :happens :month_06 Day: 26 Month: 06 :happens Event 3 Year: 2014 :month_01 Month 01

13. find all events for a given range root (0) :year_2014 :year_2013 :month_05 Month: 05 :day_24 Day: 24 :happens Event 1 :next :happens Event 2 Year: 2013 :day_25 Day: 25 :day_26 :next :happens :month_06 Day: 26 Month: 06 :happens Event 3 Year: 2014 :month_01 Month 01

14. find all events for a given range root (0) :year_2014 :year_2013 :month_05 Month: 05 :day_24 Day: 24 :happens Event 1 :next :happens Event 2 Year: 2013 :day_25 Day: 25 :day_26 :next :happens :month_06 Day: 26 Month: 06 :happens Event 3 Year: 2014 :month_01 Month 01

15. find all events for a given range START root=node(0) MATCH root-[:year_2013]-()-[:month_05]-()-[:day_24]-start,  root-[:year_2013]-()-[:month_05]-()-[:day_26]-end,  start-[:next*0..]-middle-[:next*0..]-end,  middle-[:happens]-event  RETURN event

16. does an event happen on a certain date? START event=node(20) MATCH event-[:day_24]-()-[:month_05]-()-[:year_2013]-()  RETURN event

17. does an event happen on a certain date? root (0) :year_2014 :year_2013 :month_05 Month: 05 :day_24 Day: 24 Year: 2013 :day_25 :day_26 Day: 25 Year: 2014 :month_06 Day: 26 Month: 06 :happens Event 1 (20) :happens Event 2 :happens :happens Event 3 :month_01 Month 01

18. property vs. relationship type constructing cypher queries execution plan cache vs. property load creating and deleting calendar graph

19. mixed property/relationship type START MATCH root=node(0) root-[:year_2013]-()-[:month_05]-()-[:day_24]-()-  [:hour] - (hour_node) - [:happens]-event WHERE hour_node.hour = {hour} RETURN event

20. calendar creation START ref_node = node(0) CREATE UNIQUE ref_node - [:year_2013] -> [:month_11] -> [:day_27] -> [:hour] -> RETURN hour_node (year_node (month_node (day_node (hour_node {year: {month: {day: {hour: {year}}) {month}}) {day}}) {hour}}) - -

21. deleting calendar root (0) :year_2014 :year_2013 :month_05 Month: 05 :day_24 Day: 24 Year: 2013 :day_25 :day_26 Day: 25 Year: 2014 :month_06 Day: 26 Month: 06 :happens Event 1 :happens Event 2 :happens :happens Event 3 :month_01 Month 01

22. QUESTIONS? Volker Pacher ! volker@shutl.com www.shutl.com

Editor's Notes

Its not all negative though... I believe delivery is the greatest potential weapon multichannel retailers have against the elephant in the room The reason Amazon is such a threat is that they have made consumers believe that there are only two reasons to buy online... range and price... conveniently they have a structural advantage in both these areas...
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