Neo4j 密码计数返回null而不是0

如何在零计数的情况下返回？每当我想要返回的任何字段等于零时，整个查询都会返回null？我不断遇到这个问题，我迫切需要一个解决方案

START bp=node({startnodeid}) 
WITH bp 
MATCH (bp)<-[r1?:VIEWED_PROFILE]-() 
WHERE r1.timestamp > {weekStart} AND r1.timestamp < {firstDay} 
WITH count(r1) AS dayOne, bp 
MATCH (bp)<-[r2?:VIEWED_PROFILE]-() 
WHERE r2.timestamp > {firstDay} AND r2.timestamp < {secondDay}
WITH count(r2) AS dayTwo, dayOne, bp 
MATCH (bp)<-[r3?:VIEWED_PROFILE]-() 
WHERE r3.timestamp > {secondDay} AND r3.timestamp < {thirdDay} 
WITH count(r3) AS dayThree, dayTwo, dayOne, bp 
MATCH (bp)<-[r4?:VIEWED_PROFILE]-() 
WHERE r4.timestamp > {thirdDay} AND r4.timestamp < {fourthDay}
WITH count(r4) AS dayFour, dayThree, dayTwo, dayOne, bp 
MATCH (bp)<-[r5?:VIEWED_PROFILE]-() 
WHERE r5.timestamp > {fourthDay} AND r5.timestamp < {fifthDay}
WITH count(r5) AS dayFive, dayFour, dayThree, dayTwo, dayOne, bp 
MATCH (bp)<-[r6?:VIEWED_PROFILE]-() 
WHERE r6.timestamp > {fifthDay} AND r6.timestamp < {sixthDay}
WITH count(r6) AS daySix, dayFive, dayFour, dayThree, dayTwo, dayOne, bp 
MATCH (bp)<-[r7?:VIEWED_PROFILE]-() 
WHERE r7.timestamp > {sixthDay} AND r7.timestamp < {seventhDay}
RETURN count(r7) AS daySeven, daySix, dayFive, dayFour, dayThree, dayTwo, dayOne

我的预期回报值如下：

weekStart = 0;
firstDay = 2;
secondDay = 4;
thirdDay = 6;
fourthDay = 8;
fifthDay = 10;
sixthDay = 12;
seventhDay = 14;

dayOne = 1;
dayTwo = 3;
dayThree = 2;
dayFour = 1;
dayFive = 1;
daySix = 4;
daySeven = 0;

---

你在用2.0吗？如果是这样，您可能应该完全重新组织此查询以使用

CASE/WHEN

并在那里列出一周中的几天，而不是使用

子句单独执行

你在用2.0吗？如果是这样，您可能应该完全重新组织此查询以使用
CASE/WHEN
并在那里列出一周中的几天，而不是使用
子句单独执行

我希望我使用的是2.0。我使用的是1.9。你能解释一下计数（1）在这个上下文中的作用吗？我以前从未见过这样使用它。事实上，计数（1）仍然不返回任何值。似乎对我有效，只有前两个：这就是问题所在。。。0来自第七个。我希望我使用的是2.0。我使用的是1.9。你能解释一下计数（1）在这个上下文中的作用吗？我以前从未见过这样使用它。事实上，计数（1）仍然不返回任何值。似乎对我有效，只有前两个：这就是问题所在。。。0出现在第七个1上。
MATCH (n)-[r:VIEWED_PROFILE]->(p) 
RETURN sum(CASE WHEN r.timestamp > 0 AND r.timestamp < 2 THEN 1 ELSE 0 END) AS day1,
       sum(CASE WHEN r.timestamp > 2 AND r.timestamp < 4 THEN 1 ELSE 0 END) AS day2, 
       sum(CASE WHEN r.timestamp > 4 AND r.timestamp < 6 THEN 1 ELSE 0 END) AS day3, 
       sum(CASE WHEN r.timestamp > 6 AND r.timestamp < 8 THEN 1 ELSE 0 END) AS day4, 
       sum(CASE WHEN r.timestamp > 8 AND r.timestamp < 10 THEN 1 ELSE 0 END) AS day5,
       sum(CASE WHEN r.timestamp > 10 AND r.timestamp < 12 THEN 1 ELSE 0 END) AS day6, 
       sum(CASE WHEN r.timestamp > 12 AND r.timestamp < 14 THEN 1 ELSE 0 END) AS day7

START bp=node(1) 
MATCH (bp)<-[r1?:VIEWED_PROFILE]-() 
WITH collect(r1.timestamp) AS times 
RETURN length(filter(t IN times WHERE t > 0 AND t < 2)) AS day1, 
       length(filter(t IN times WHERE t > 2 AND t < 4)) AS day2, 
       length(filter(t IN times WHERE t > 12 AND t < 14)) AS day7