databases-course/week12/queries.txt

CREATE	(a:Fighter{name:'Khabib Nurmagomedov', weight:'155'}),
		(b:Fighter{name:'Rafael Dos Anjos', weight:'155'}),
		(c:Fighter{name:'Neil Magny', weight:'170'}),
		(d:Fighter{name:'Jon Jones', weight:'205'}),
		(e:Fighter{name:'Daniel Cormier', weight:'205'}),
		(f:Fighter{name:'Michael Bisping', weight:'185'}),
		(g:Fighter{name:'Matt Hamill', weight:'185'}),
		(h:Fighter{name:'Brandon Vera', weight:'205'}),
		(i:Fighter{name:'Frank Mir', weight:'230'}),
		(j:Fighter{name:'Brock Lesnar', weight:'230'}),
		(k:Fighter{name:'Kelvin Gastelum', weight:'185'}),
		(a)-[:beats]->(b),
		(b)-[:beats]->(c),
		(d)-[:beats]->(e),
		(f)-[:beats]->(g),
		(d)-[:beats]->(h),
		(h)-[:beats]->(i),
		(i)-[:beats]->(j),
		(c)-[:beats]->(k),
		(k)-[:beats]->(f),
		(k)-[:beats]->(f),
		(f)-[:beats]->(g),
		(f)-[:beats]->(k),
		(g)-[:beats]->(d)

# visualize
MATCH (a: Fighter)-[r]-(b) RETURN r, a, b;

# middle/welter/light
MATCH (a: Fighter)-[:beats]->()
WHERE a.weight = '155' OR a.weight = '170' OR a.weight = '185'
RETURN a.weight, collect(DISTINCT a.name)

# 1-1
MATCH (a: Fighter)-[r1:beats]->(b: Fighter)-[r2:beats]->(c: Fighter)
WITH a, b, c, count(*) AS cnt
WHERE a = c AND cnt = 1
RETURN a, b;

# gretest number of fights
MATCH (a: Fighter)-[r:beats]->()
WITH a.name as name, count(a.name) as cnt
CALL {
    MATCH (a: Fighter)-[r:beats]->()
    WITH a.name as name, count(a.name) as cnt
    RETURN max(cnt) as mx
}
WITH name, cnt, mx
WHERE cnt = mx
RETURN name

# Undefeated
MATCH (a: Fighter)
WHERE NOT EXISTS (()-[:beats]->(a))
RETURN a

# defeated
MATCH (a: Fighter)
WHERE NOT EXISTS ((a)-[:beats]->())
RETURN a