Webinar: Intro to Cypher

|---------+--------------------+-----------------------------------------+--------------------+------------|
| season | playerName | playerUri | playerPosition | playerAge |
|---------+--------------------+-----------------------------------------+--------------------+------------|
| 90/91 | Aldair | /aldair/profil/spieler/4151 | Centre Back | 24 |
| 90/91 | Thomas Häßler | /thomas-hassler/profil/spieler/553 | Attacking Midfield | 24 |
| 90/91 | Roberto Baggio | /roberto-baggio/profil/spieler/4153 | Secondary Striker | 23 |
| 90/91 | Karl-Heinz Riedle | /karl-heinz-riedle/profil/spieler/13806 | Centre Forward | 24 |
| 90/91 | Henrik Larsen | /henrik-larsen/profil/spieler/101330 | Attacking Midfield | 24 |
| 90/91 | Gheorghe Hagi | /gheorghe-hagi/profil/spieler/7939 | Attacking Midfield | 25 |
| 90/91 | Hristo Stoichkov | /hristo-stoichkov/profil/spieler/7938 | Left Wing | 24 |
| 90/91 | Brian Laudrup | /brian-laudrup/profil/spieler/39667 | Centre Forward | 21 |
| 90/91 | Miguel Ángel Nadal | /miguel-angel-nadal/profil/spieler/7676 | Centre Back | 23 |
|---------+--------------------+-----------------------------------------+--------------------+------------|

|-------------------+---------------------+-------------------------------------+--------------------|
| sellerClubName | sellerClubNameShort | sellerClubUri | sellerClubCountry |
|-------------------+---------------------+-------------------------------------+--------------------|
| SL Benfica | Benfica | /benfica/startseite/verein/294 | Portugal |
| 1. FC Köln | 1. FC Köln | /1-fc-koln/startseite/verein/3 | Germany |
| ACF Fiorentina | Fiorentina | /fiorentina/startseite/verein/430 | Italy |
| SV Werder Bremen | Werder Bremen | /werder-bremen/startseite/verein/86 | Germany |
| Lyngby BK | Lyngby BK | /lyngby-bk/startseite/verein/369 | Denmark |
| Steaua Bucharest | Steaua | /steaua/startseite/verein/301 | Romania |
| CSKA Sofia | CSKA Sofia | /cska-sofia/startseite/verein/208 | Bulgaria |
| KFC Uerdingen 05 | KFC Uerdingen | /kfc-uerdingen/startseite/verein/95 | Germany |
| RCD Mallorca | RCD Mallorca | /rcd-mallorca/startseite/verein/237 | Spain |
|-------------------+---------------------+-------------------------------------+--------------------|

|----------------+--------------------+-------------------------------------+-------------------|
| buyerClubName | buyerClubNameShort | buyerClubUri | buyerClubCountry |
|----------------+--------------------+-------------------------------------+-------------------|
| AS Roma | AS Roma | /as-roma/startseite/verein/12 | Italy |
| Juventus FC | Juventus | /juventus/startseite/verein/506 | Italy |
| Juventus FC | Juventus | /juventus/startseite/verein/506 | Italy |
| SS Lazio | Lazio | /lazio/startseite/verein/398 | Italy |
| AC Pisa 1909 | AC Pisa | /ac-pisa/startseite/verein/4172 | Italy |
| Real Madrid | Real Madrid | /real-madrid/startseite/verein/418 | Spain |
| FC Barcelona | FC Barcelona | /fc-barcelona/startseite/verein/131 | Spain |
| Bayern Munich | Bayern Munich | /bayern-munich/startseite/verein/27 | Germany |
| FC Barcelona | FC Barcelona | /fc-barcelona/startseite/verein/131 | Spain |
|----------------+--------------------+-------------------------------------+-------------------|

|--------------------------------------------------------+-------------+---------------|
| transferUri | transferFee | transferRank |
|--------------------------------------------------------+-------------+---------------|
| /jumplist/transfers/spieler/4151/transfer_id/6993 | £6.75m | 1 |
|--------------------------------------------------------+-------------+---------------|

players
id
name
position
clubs
id
name
country
transfers
id
fee
player_age
player_id
from_club_id
to_club_id
season

Records
in tables
Nodes
"Soft"
relationships
computed at
query time
"Hard"
relationships
built into the
data store

CREATE TABLE players (
"id" character varying(100)
NOT NULL PRIMARY KEY,
"name" character varying(150) NOT NULL,
"position" character varying(20)
);

INSERT INTO players
VALUES('/aldair/profil/spieler/4151', 'Aldair', 'Centre Back');
INSERT INTO players
VALUES('/thomas-hassler/profil/spieler/553', 'Thomas Häßler',
'Attacking Midfield');
INSERT INTO players VALUES('/roberto-baggio/profil/spieler/4153',
'Roberto Baggio', 'Secondary Striker');

CREATE TABLE clubs (
"country" character varying(50)
);

INSERT INTO clubs VALUES('/hertha-bsc/startseite/verein/44',
'Hertha BSC', 'Germany');
INSERT INTO clubs VALUES('/cfr-cluj/startseite/verein/7769', 'CFR
Cluj', 'Romania');
INSERT INTO clubs VALUES('/real-sociedad/startseite/verein/681',
'Real Sociedad', 'Spain');

CREATE TABLE transfers (
"id" character varying(100) NOT NULL PRIMARY KEY,
"fee" character varying(50) NOT NULL,
"numericFee" integer NOT NULL,
"player_age" smallint NOT NULL,
"season" character varying(5) NOT NULL,
"player_id" character varying(100) NOT NULL REFERENCES players (id),
"from_club_id" character varying(100) NOT NULL REFERENCES clubs (id),
"to_club_id" character varying(100) NOT NULL REFERENCES clubs (id)
);

INSERT INTO transfers VALUES('/jumplist/transfers/spieler/4151/transfer_id/6993', '
£6.75m', 6750000, '90/91', 24, '/aldair/profil/spieler/4151',
'/benfica/startseite/verein/294', '/as-roma/startseite/verein/12');
£5.85m', 5850000, '90/91', 24, '/thomas-hassler/profil/spieler/553',
'/1-fc-koln/startseite/verein/3', '/juventus/startseite/verein/506');
£5.81m', 5810000, '90/91', 23, '/roberto-baggio/profil/spieler/4153',
'/fiorentina/startseite/verein/430', '/juventus/startseite/verein/506');

LOAD CSV WITH HEADERS FROM "(file|http)://" AS row
MATCH (:Label {property: row.header})
CREATE (:Label {property: row.header})
MERGE (:Label {property: row.header})

LOAD CSV WITH HEADERS
FROM "file:///transfers.csv"
AS row
RETURN COUNT(*)

LOAD CSV WITH HEADERS
FROM "file:///transfers.csv"
AS row
RETURN row
LIMIT 1

LOAD CSV WITH HEADERS FROM "file:///transfers.csv" AS row
CREATE (player:Player {
id: row.playerUri,
name: row.playerName,
position: row.playerPosition
})

CREATE CONSTRAINT ON (player:Player)
ASSERT player.id IS UNIQUE

CREATE (player:Player {
id: row.playerUri,
name: row.playerName,
position: row.playerPosition
})
Node 25 already exists with label Player and property
"id"=[/peter-lux/profil/spieler/84682]

MERGE (player:Player {id: row.playerUri})
ON CREATE SET player.name = row.playerName,
player.position = row.playerPosition

CREATE CONSTRAINT ON (club:Club)
ASSERT club.id IS UNIQUE

MERGE (club:Club {id: row.sellerClubUri})
ON CREATE SET club.name = row.sellerClubName,
club.country = row.sellerClubCountry;
MERGE (club:Club {id: row.buyerClubUri})
ON CREATE SET club.name = row.buyerClubName,
club.country = row.buyerClubCountry;

CREATE CONSTRAINT ON (transfer:Transfer)
ASSERT transfer.id IS UNIQUE

MATCH (player:Player {id: row.playerUri})
MATCH (source:Club {id: row.sellerClubUri})
MATCH (destination:Club {id: row.buyerClubUri})
MERGE (t:Transfer {id: row.transferUri})
ON CREATE SET t.season = row.season, t.rank = row.transferRank,
t.fee = row.transferFee
MERGE (t)-[:OF_PLAYER { age: row.playerAge }]->(player)
MERGE (t)-[:FROM_CLUB]->(source)
MERGE (t)-[:TO_CLUB]->(destination)

CREATE CONSTRAINT ON (club:Club)
ASSERT exists(club.name)

CREATE CONSTRAINT ON ()-[player:OF_PLAYER]-()
ASSERT exists(player.age)

SELECT *
FROM players
WHERE players.name = 'Cristiano Ronaldo'

SELECT *
FROM players
WHERE players.name = 'Cristiano Ronaldo'
MATCH (player:Player { name: "Cristiano Ronaldo" })
RETURN player

SELECT players.name, t."numericFee", t.season
FROM transfers AS t
JOIN clubs AS clubFrom ON t.from_club_id = clubFrom.id
JOIN clubs AS clubTo ON t.to_club_id = clubTo.id
JOIN players ON t.player_id = players.id
WHERE clubFrom.name = 'Tottenham Hotspur' AND clubTo.name = 'Manchester United'

SELECT players.name, t."numericFee", t.season
FROM transfers AS t
WHERE clubFrom.name = 'Tottenham Hotspur' AND clubTo.name = 'Manchester United'
MATCH (from:Club)<-[:FROM_CLUB]-(transfer:Transfer)-[:TO_CLUB]->(to:Club),
(transfer)-[:OF_PLAYER]->(player)
WHERE from.name = "Tottenham Hotspur" AND to.name = "Manchester United"
RETURN player.name, transfer.numericFee, transfer.season

MATCH (from:Club)<-[:FROM_CLUB]-(transfer:Transfer)-[:TO_CLUB]->(to:Club),
(transfer)-[:OF_PLAYER]->(player)
WHERE from.name = "Tottenham Hotspur" AND to.name = "Manchester United"
RETURN player.name, transfer.numericFee, transfer.season

|------------------------------------------+--------------------+--------------------|
| playerUri | playerName | playerNationality |
|------------------------------------------+--------------------+--------------------|
| /aldair/profil/spieler/4151 | Aldair | Brazil |
| /thomas-hassler/profil/spieler/553 | Thomas Häßler | Germany |
| /roberto-baggio/profil/spieler/4153 | Roberto Baggio | Italy |
| /karl-heinz-riedle/profil/spieler/13806 | Karl-Heinz Riedle | Germany |
| /henrik-larsen/profil/spieler/101330 | Henrik Larsen | Denmark |
| /gheorghe-hagi/profil/spieler/7939 | Gheorghe Hagi | Romania |
| /hristo-stoichkov/profil/spieler/7938 | Hristo Stoichkov | Bulgaria |
| /brian-laudrup/profil/spieler/39667 | Brian Laudrup | Denmark |
| /miguel-angel-nadal/profil/spieler/7676 | Miguel Ángel Nadal | Spain |
|------------------------------------------+--------------------+--------------------|

players
id
name
position
nationality
clubs
id
name
country
transfers
id
fee
player_age
player_id
from_club_id
to_club_id
season

ALTER TABLE players
ADD COLUMN nationality varying(30);

UPDATE players
SET nationality = 'Brazil'
WHERE players.id = '/aldair/profil/spieler/4151';
UPDATE players
SET nationality = 'Germany'
WHERE players.id ='/ulf-kirsten/profil/spieler/74';
UPDATE players
SET nationality = 'England'
WHERE players.id ='/john-lukic/profil/spieler/28241';

MATCH (player:Player {id: row.playerUri})
SET player.nationality = row.playerNationality

SELECT players.name, clubFrom.name, clubTo.name, t."numericFee", t.season
FROM transfers AS t
WHERE clubFrom.country = 'England' AND clubTo.country = 'England'
AND players.nationality = 'England'
ORDER BY t."numericFee" DESC
LIMIT 10

FROM transfers AS t
WHERE clubFrom.country = 'England' AND clubTo.country = 'England'
AND players.nationality = 'England'
LIMIT 10
MATCH (to:Club)<-[:TO_CLUB]-(t:Transfer)-[:FROM_CLUB]-(from:Club), (t)-[:OF_PLAYER]->(player:Player)
WHERE to.country = "England" AND from.country = "England" AND player.nationality = "England"
RETURN player.name, from.name, to.name, t.numericFee, t.season
ORDER BY t.numericFee DESC
LIMIT 10

|----------------------+----------------|
| country | confederation |
|----------------------+----------------|
| Afghanistan | afc |
| Albania | uefa |
| Algeria | caf |
| American Samoa | ofc |
| Andorra | uefa |
| Angola | caf |
| Anguilla | concacaf |
| Antigua and Barbuda | concacaf |
| Argentina | conmebol |
|----------------------+----------------|
|-----------+-----------+-------------------------------------------------|
| urlName | shortName | region |
|-----------+-----------+-------------------------------------------------|
| afc | AFC | Asia |
| uefa | UEFA | Europe |
| ofc | OFC | Oceania |
| conmebol | CONMEBOL | South America |
| concacaf | CONCACAF | North American, Central American and Caribbean |
| caf | CAF | Africa |
|-----------+-----------+-------------------------------------------------|

players
id
name
position
country_id
clubs
id
name
country_id
transfers
id
fee
player_age
player_id
from_club_id
to_club_id
season
countries
id
name
confederation_id
confederations
id
shortName
name
region

CREATE TABLE confederations (
"shortName" character varying(50) NOT NULL,
"region" character varying(100) NOT NULL
);

INSERT INTO confederations VALUES('afc', 'AFC', 'Asian Football
Confederation', 'Asia');
INSERT INTO confederations VALUES('uefa', 'UEFA', 'Union of
European Football Associations', 'Europe');
INSERT INTO confederations VALUES('ofc', 'OFC', 'Oceania Football
Confederation', 'Oceania');

CREATE TABLE countries (
"code" character varying(3)
"name" character varying(50)
NOT NULL,
"federation" character varying(10) NOT NULL
REFERENCES confederations (id)
);

INSERT INTO countries VALUES('MNE', 'Montenegro', 'uefa');
INSERT INTO countries VALUES('LTU', 'Lithuania', 'uefa');
INSERT INTO countries VALUES('CAM', 'Cambodia', 'afc');
INSERT INTO countries VALUES('SUI', 'Switzerland', 'uefa');
INSERT INTO countries VALUES('ETH', 'Ethiopia', 'caf');
INSERT INTO countries VALUES('ARU', 'Aruba', 'concacaf');
INSERT INTO countries VALUES('SWZ', 'Swaziland', 'caf');
INSERT INTO countries VALUES('PLE', 'Palestine', 'afc');

ALTER TABLE clubs
ADD COLUMN country_id character varying(3)
REFERENCES countries(code);

UPDATE clubs AS cl
SET country_id = c.code
FROM clubs
INNER JOIN countries AS c
ON c.name = clubs.country
WHERE cl.id = clubs.id;

ALTER TABLE clubs
DROP COLUMN country;

ALTER TABLE players
ADD COLUMN country_id character varying(3)
REFERENCES countries(code);

UPDATE players AS p
SET country_id = c.code
FROM players
INNER JOIN countries AS c
ON c.name = players.nationality
WHERE p.id = players.id;

ALTER TABLE players
DROP COLUMN nationality;

LOAD CSV WITH HEADERS FROM "file:///confederations.csv" AS row
MERGE (c:Confederation {id: row.urlName})
ON CREATE SET c.shortName = row.shortName,
c.region = row.region,
c.name = row.name

LOAD CSV WITH HEADERS FROM "file:///countries.csv" AS row
MATCH (conf:Confederation {id: row.confederation })
MERGE (country:Country {id: row.countryCode})
ON CREATE SET country.name = row.country
MERGE (country)-[:PART_OF]->(conf)

MATCH (club:Club)
MATCH (country:Country {name: club.country})
MERGE (club)-[:PART_OF]->(country)
REMOVE club.country

MATCH (player:Player)
MATCH (country:Country {name: player.nationality})
MERGE (player)-[:PLAYS_FOR]->(country)
REMOVE player.nationality

FROM transfers AS t
JOIN countries AS fromCount ON clubFrom.country_id = fromCount.code
JOIN countries AS toCount ON clubTo.country_id = toCount.code
JOIN countries AS playerCount ON players.country_id = playerCount.code
WHERE fromCount.name = 'England' AND toCount.name = 'England' AND playerCount.name = 'England'
LIMIT 10
MATCH (to:Club)<-[:TO_CLUB]-(t:Transfer)-[:FROM_CLUB]-(from:Club), (t)-[:OF_PLAYER]->(player:Player),
(player)-[:PLAYS_FOR]->(country:Country), (to)-[:PART_OF]->(country)<-[:PART_OF]-(from)
WHERE country.name = "England"
LIMIT 10

SELECT * FROM transfers AS t
JOIN countries AS fromCountry ON clubFrom.country_id = fromCountry.code
JOIN countries AS toCountry ON clubTo.country_id = toCountry.code
JOIN confederations AS fromConfederation ON fromCountry.federation = fromConfederation.id
JOIN confederations AS toConfederation ON toCountry.federation = toConfederation.id
WHERE fromConfederation.id = 'afc' AND toConfederation.id = 'uefa'
LIMIT 10
MATCH (to:Club)<-[:TO_CLUB]-(t:Transfer)-[:FROM_CLUB]-(from:Club), (t)-[:OF_PLAYER]->(player:Player),
(from)-[:PART_OF*2]->(:Confederation {id: "afc"}),
(to)-[:PART_OF*2]->(:Confederation {id: "uefa"})
LIMIT 10

CALL db.labels()
+=============+
|label |
+=============+
|Player |
+-------------+
|Club |
+-------------+
|Transfer |
+-------------+
|Loan |
+-------------+
|Confederation|
+-------------+
|Country |
+-------------+

CALL db.indexes()
╒════════════════════════╤════════╤══════════════════════╕
│"description" │"state" │"type" │
╞════════════════════════╪════════╪══════════════════════╡
│"INDEX ON :Club(id)" │"ONLINE"│"node_unique_property"│
├────────────────────────┼────────┼──────────────────────┤
│"INDEX ON :Club(name)" │"ONLINE"│"node_label_property" │
├────────────────────────┼────────┼──────────────────────┤
│"INDEX ON :Player(id)" │"ONLINE"│"node_unique_property"│
├────────────────────────┼────────┼──────────────────────┤
│"INDEX ON :Player(name)"│"ONLINE"│"node_label_property" │
└────────────────────────┴────────┴──────────────────────┘

CALL db.constraints()
╒══════════════════════════════════════════════════════════════════════════╕
│"description" │
╞══════════════════════════════════════════════════════════════════════════╡
│"CONSTRAINT ON ( club:Club ) ASSERT club.id IS UNIQUE" │
├──────────────────────────────────────────────────────────────────────────┤
│"CONSTRAINT ON ( club:Club ) ASSERT exists(club.name)" │
├──────────────────────────────────────────────────────────────────────────┤
│"CONSTRAINT ON ( player:Player ) ASSERT player.id IS UNIQUE" │
├──────────────────────────────────────────────────────────────────────────┤
│"CONSTRAINT ON ()-[ of_player:OF_PLAYER ]-() ASSERT exists(of_player.age)"│
└──────────────────────────────────────────────────────────────────────────┘

MATCH (country:Country)
RETURN keys(country), COUNT(*) AS times
+-----------------------+
| keys(country) | times |
+-----------------------+
| ["id","name"] | 198 |
+-----------------------+

MATCH (club:Club)
RETURN keys(club), COUNT(*) AS times
+---------------------------------+
| keys(club) | times |
+---------------------------------+
| ["id","name"] | 806 |
| ["name","country","id"] | 1 |
+---------------------------------+

MATCH (club:Club)
WHERE NOT (club)-[:PART_OF]->()
RETURN club
+=====================================================================+
|club |
+=====================================================================+
|{name: Unknown, id: /unknown/startseite/verein/75} |
+---------------------------------------------------------------------+
|{country: Monaco, name: AS Monaco, id: /monaco/startseite/verein/162}|
+---------------------------------------------------------------------+

# drop table countries;
ERROR: cannot drop table countries because other objects depend
on it
DETAIL: constraint playersfk on table players depends on table
countries
HINT: Use DROP ... CASCADE to drop the dependent objects too.

DELETE country
org.neo4j.kernel.api.exceptions.TransactionFailureException:
Node record Node[11306,used=false,....] still has relationships

DETACH DELETE country
Deleted 198 nodes, deleted 5071 relationships,
statement executed in 498 ms.

github.com/neo4j-meetups/cypher-for-sql-developers

Webinar: Intro to Cypher

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