1. MongoDB Queries and Aggregation
Valeri Karpov
Kernel Tools Engineer, MongoDB
www.thecodebarbarian.com
github.com/vkarpov15
@code_barbarian

2. Introducing an Awesome Data Set
•Scraped basketball-reference.com
•Mad props to NPM module Cheerio
•Box scores for all 31,686 NBA games since 1985
•Download: http://bit.ly/1jlgs9u via S3
•Untar and run mongorestore
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3. Data Set Structure
•Contains final score
•Contains box score for teams and players
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4. Data Set Structure - High Level
•Contains _id, date
•Info on winning team and losing team
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5. Data Set Structure - Box
•Box score contains detailed stats by team
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6. Data Set Structure - Box
•And also for individual players:
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7. Queries and Aggregation
•MongoDB has a rich query framework
•Aggregation framework is like SQL’s group by
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8. Query Basics - findOne()
•When was Kobe Bryant’s 81 point game?
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9. Query Basics - find()
•Which teams have lost despite scoring more than
150 points?
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10. Query Basics - count()
•How many games did the Lakers win in the 19992000 season?
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11. Query Basics - distinct()
•Which teams have lost a game despite having a
player make at least 10 3 pointers?
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12. Query Basics - $elemMatch operator
•When did Michael Jordan score 60 points in a losing
effort?
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13. Query Basics - $elemMatch operator
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14. Query Basics - .sort() and .limit()
•What are the 5 highest point totals for a losing
team?
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15. Query Basics - .sort() and .limit()
•What are the 5 highest point totals for a losing
team?
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16. Aggregation
•Similar to SQL group by
•Filters and transforms data in pipeline stages
•Stages are chainable
•Accessible via the .aggregate() function in shell
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17. Aggregation - Lakers Season PPG
•How many points did the Lakers average in games
they won in the 2008-2009 season?
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18. Aggregation - Lakers Season PPG
•How many points did the Lakers average in games
they won in the 2008-2009 season?
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19. Aggregation - $sort and $limit
•Compute the teams with the 5 best records in the
1999-2000 season
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20. Aggregation - $sort and $limit
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21. Aggregation - $sort and $limit
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22. Aggregation - $unwind
•Random statistic: player with highest scoring
average in games their team lost
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23. Aggregation - $unwind
•Random statistic: player with highest scoring
average in games their team lost
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24. Aggregation - Fun With Steals
•How often does a team win when they record more
steals than the other team?
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25. Aggregation - Fun With Steals
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26. Aggregation - Fun With Steals
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27. Thanks for Listening!
Slides on Twitter, @code_barbarian
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