Master-DataScience-Notes/1year/3trimester/Coding for Data Science and Data Management/Data Management/exerciseMongoDB.json

// mongoimport --db=soccerdb --collection=rosters --file=dbs/roster.json

// mongoimport --db=soccerdb --collection=bets --file=dbs/bets.json

// show dbs
// use soccerdb
// show collections


/*
retrieve the matches played in France Ligue 1 by
FC Nantes as home team
*/
db.bets.find(
  {
    "league": "France Ligue 1",
    "country": "France",
    //  "home_team_name": "FC Nantes"
    "home_team_name": /.*Nantes.*/
  },
  {
    "_id":0,
    "home_team_name":1,
    "away_team_name":1,
    "home_team_goal":1,
    "away_team_goal":1
  }
);

//1° par is the filtering criteria,
//2° par is the projection action to the output.

/*
retrieve the matches played in France Ligue 1 by
FC Nantes
*/
db.bets.find(
  {
    "$and":[
      {"league": "France Ligue 1"},
      {"country": "France"}
    ],
    "$or": [
      {"home_team_name": /.*Nantes.*/},
      {"away_team_name": /.*Nantes.*/}
    ]
  },
  {
    "_id":0,
    "home_team_name":1,
    "away_team_name":1,
    "home_team_goal":1,
    "away_team_goal":1
  }
);


/*
retrieve the matches played in France Ligue 1 by
FC Nantes in 2008
*/

db.bets.find(
  {
    "$and":[
      {"league": "France Ligue 1"},
      {"match_date": { "$gte": new ISODate('2008-01-01') } }
      {"match_date": { "$lte": new ISODate('2008-12-31') } }

    ],
    "$or": [
      {"home_team_name": /.*Nantes.*/},
      {"away_team_name": /.*Nantes.*/}
    ]
  },
  {
    "_id":0,
    "home_team_name":1,
    "away_team_name":1,
    "home_team_goal":1,
    "away_team_goal":1
  }
);


/* retrieve the matches played in France Ligue 1
by FC Nantes and AJ Auxerre in 2008
*/
db.bets.find(
  {

    {"league": "France Ligue 1"},
    "$and":[
      {"match_date": { "$gte": new ISODate('2008-01-01') } }
      {"match_date": { "$lte": new ISODate('2008-12-31') } }

    ],
    "$or": [
      {"home_team_name": {"$in": ["FC Nantes","AJ Auxerre"] },
      {"away_team_name": {"$in": ["FC Nantes","AJ Auxerre"] }
    ]
  },
  {
    "_id":0,
    "home_team_name":1,
    "away_team_name":1,
    "home_team_goal":1,
    "away_team_goal":1
  }
);


/* retrieve the matches played in France Ligue 1
by FC Nantes that have benne quoted by Bet365
*/

// Since bets are in nested properties, we use "." notation
db.bets.find(
  {
    "league": "France Ligue 1",
    "bet.Bet365": {"$exists": true},
    "$or": [
      {"home_team_name": {"$in": ["FC Nantes","AJ Auxerre"] },
      {"away_team_name": {"$in": ["FC Nantes","AJ Auxerre"] }
    ]
  },
  {
    "_id":0,
    "home_team_name":1,
    "away_team_name":1,
    "home_team_goal":1,
    "away_team_goal":1,
    "bet.Bet365":1
  }
);

/* retrieve the number of matches played in
the Serie A for each available year
*/

//Stages of aggregation that we used in Mongodb:
// $match, $project, $group

// Match - condition for filtering   {"match" : {"league":"Italy Serie A", ...}}
// Project
// Group - Aggregation step for match year, then we are summing the number of matches
// $year extract the year from a given date
db.bets.aggregate
(
  {"$match" : {"league":"Italy Serie A"} },
  {"$project" : {"_id": 0, "matchyear": {"$year": "$match_date"} } },
  {"$group": {"_id": "$matchyear","number_of_match":{"$sum": 1} } }
);

/*
retrieve the sum of goals scored in 2009 in the SerieA
*/
db.bets.aggregate
(
  {"$match" : {"league":"Italy Serie A", "$and":
  [
    {"match_date": {"$gte": new ISODate('2009-01-01')}},
    {"match_date": {"$lte": new ISODate('2009-12-31')}}

  ] } },
  {"$project" : {"_id": 0,
                "match_year": {"$year": "$match_date"},
                "match_goals": {"$sum": ["$home_team_goal", "away_team_goal"] } } },
  {"$group": {"_id": "$match_year","goals":{"$sum": "$match_goals"} } }
);